UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

FORM 10-Q/A

(Amendment No. 1)

(Mark One)

x                              QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2006

OR

o                                 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                                    to                                   

Commission file number: 1-13011

COMFORT SYSTEMS USA, INC.

(Exact name of registrant as specified in its charter)

777 Post Oak Boulevard

Suite 500

Houston, Texas 77056

(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code: (713) 830-9600

Indicate by check mark whether the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securites Act.
Yes o   No x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes o   No x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x   No o

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer (as defined in Rule 12b-2 of the Exchange Act). Large accelerated filer o   Accelerated filer x   Non-accelerated filer o

Indicate by check mark whether the registrant is a shell company (as defined in Exchange Act Rule 12b-2). Yes o   No x

The number of shares outstanding of the issuer’s common stock, as of July 31, 2006 was 40,656,958.

Explanatory Note

This Amendment No. 1 to Form 10-Q for the period ended June 30, 2006 is being filed to provide a revision to Part I, Item 4. Controls and Procedures.  The revision includes a statement that our internal controls were evaluated as of the end of the fiscal quarter as required by Rules 13a —15(b) of the Securities Exchange Act of 1934.  Additionally, Part II, Item 6. Exhibits, of this Amendment has been revised to contain currently-dated certifications from our Chief Executive Officer and Chief Financial Officer, as required by Sections 302 and 906 of the Sarbanes-Oxley Act of 2002.  No other information in this filing has been updated for events or information subsequent to the date of filing of the original Form 10-Q.

COMFORT SYSTEMS USA, INC.
INDEX TO FORM 10-Q
FOR THE QUARTER ENDED JUNE 30, 2006

COMFORT SYSTEMS USA, INC.
CONSOLIDATED BALANCE SHEETS

(In Thousands, Except Share Amounts)

The accompanying notes are an integral part of these consolidated financial statements.

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COMFORT SYSTEMS USA, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS

(In Thousands, Except Per Share Data)
(Unaudited)

The accompanying notes are an integral part of these consolidated financial statements.

2

COMFORT SYSTEMS USA, INC.
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(In Thousands, Except Share Amounts)

The accompanying notes are an integral part of these consolidated financial statements.

3

COMFORT SYSTEMS USA, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS

(In Thousands)
(Unaudited)

The accompanying notes are an integral part of these consolidated financial statements.

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COMFORT SYSTEMS USA, INC.
CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2006
(Unaudited)

1.                                      Business and Organization

Comfort Systems USA, Inc., a Delaware corporation (“Comfort Systems” and collectively with its subsidiaries, the “Company”), is a national provider of comprehensive heating, ventilation and air conditioning (“HVAC”) installation, maintenance, repair and replacement services within the mechanical services industry. The Company operates primarily in the commercial, industrial and institutional HVAC markets, and performs most of its services within office buildings, retail centers, apartment complexes, manufacturing plants, and healthcare, education and government facilities. In addition to standard HVAC services, the Company provides specialized applications such as building automation control systems, fire protection, process cooling, electronic monitoring and process piping. Certain locations also perform related activities such as electrical service and plumbing. Approximately 61% of the Company’s consolidated 2006 revenues to date are attributable to installation of systems in newly constructed facilities, with the remaining 39% attributable to maintenance, repair and replacement services. The following service activities account for the Company’s consolidated 2006 revenues to date: HVAC—74%, plumbing—18%, building automation control systems—3%, and other—5%. These service activities are within the mechanical services industry which is the single industry segment served by Comfort Systems.

2.                                      Summary of Significant Accounting Policies

Basis of Presentation

These interim statements should be read in conjunction with the historical Consolidated Financial Statements and related notes of Comfort Systems included in the Annual Report on Form 10-K as filed with the Securities and Exchange Commission (“SEC”) for the year ended December 31, 2005 (the “Form 10-K”).

There were no significant changes in the accounting policies of the Company during the current period except for the adoption of Financial Accounting Standards Board (“FASB”) Statement 123 (revised 2004) “Share-Based Payment” (“Statement 123R”), as further discussed in Note 8. For a description of the significant accounting policies of the Company, refer to Note 2 of Notes to Consolidated Financial Statements of Comfort Systems included in the Form 10-K.

The accompanying unaudited consolidated financial statements were prepared using generally accepted accounting principles for interim financial information and the instructions to Form 10-Q and applicable rules of Regulation S-X of the SEC. Accordingly, these financial statements do not include all the footnotes required by generally accepted accounting principles for complete financial statements, and should be read in conjunction with the Form 10-K. The Company believes all adjustments necessary for a fair presentation of these interim statements have been included and are of a normal and recurring nature. The results of operations for interim periods are not necessarily indicative of the results for the full fiscal year.

Cash Flow Information

Cash paid for interest for the three months ended June 30, 2005 and 2006 was approximately $0.5 million and $0.1 million, respectively. Cash paid for income taxes for continuing operations for the three months ended June 30, 2005 and 2006 was approximately $0.6 million and $5.2 million, respectively. Cash paid for income taxes for discontinued operations for the three months ended June 30, 2005 and 2006 was less than $0.1 million for both periods, respectively.

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Cash paid for interest for the six months ended June 30, 2005 and 2006 was approximately $0.7 million and $0.2 million, respectively. Cash paid for income taxes for continuing operations for the six months ended June 30, 2005 and 2006 was approximately $3.7 million and $5.8 million, respectively. Cash paid for income taxes for discontinued operations for the six months ended June 30, 2005 and 2006 was less than $0.1 million and $7.0 million, respectively. The taxes paid for discontinued operations for 2006 related to the sale in 2005 of two operations to Automated Logic Corporation and Automated Logic Contracting Services, Inc. These taxes are included in the caption “Taxes paid related to the sale of businesses” in the accompanying consolidated statement of cash flows.

During the three months ended June 30, 2006, the Company paid a quarterly cash dividend of $1.4 million, or $0.035 per share. The Company paid $2.8 million in cash dividends, or $0.070 per share, for the six months ended June 30, 2006. There were no dividends paid during the first six months of 2005.

Segment Disclosure

Comfort Systems’ activities are within the mechanical services industry which is the single industry segment served by the Company. Under Statement of Financial Accounting Standards (“SFAS”) No. 131, “Disclosures About Segments of an Enterprise and Related Information,” each operating subsidiary represents an operating segment and these segments have been aggregated, as no individual operating unit is material and the operating units meet a majority of SFAS No. 131’s aggregation criteria.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires the use of estimates and assumptions by management in determining the reported amounts of assets and liabilities, revenues and expenses and disclosures regarding contingent assets and liabilities. Actual results could differ from those estimates. The most significant estimates used in the Company’s financial statements affect revenue and cost recognition for construction contracts, the allowance for doubtful accounts, self-insurance accruals, deferred tax assets, warranty accruals, and the quantification of fair value for reporting units in connection with the Company’s goodwill impairment testing.

Income Taxes

The Company files a consolidated return for federal income tax purposes. Income taxes are provided for under the liability method in accordance with SFAS No. 109, “Accounting for Income Taxes,” which takes into account differences between financial statement treatment and tax treatment of certain transactions. Deferred tax assets represent the tax effect of activity that has been reflected in the financial statements but which will not be deductible for tax purposes until future periods. Deferred tax liabilities represent the tax effect of activity that has been reflected in the financial statements but which will not be taxable until future periods.

The Company regularly evaluates valuation allowances established for deferred tax assets for which future realization is uncertain. The Company performs this evaluation each quarter. Estimations of required valuation allowances include estimates of future taxable income. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which the activity underlying these assets becomes deductible. The Company considers projected future taxable income and tax planning strategies in making this assessment. If actual future taxable income is less than the estimates, the Company may not realize all or a portion of the recorded deferred tax assets.

The effective tax rate associated with results from continuing operations for the first six months of 2006 was 39.0%, compared to 43.1% in 2005. The Company’s effective tax rate is generally higher than statutory rates because of the effect of certain expenses that are not deductible for tax purposes. In

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addition, adjustments to tax reserves are analyzed quarterly as events occur to warrant such changes. Adjustments to tax reserves are a component of the effective tax rate.

New Accounting Pronouncements

In June 2006, the FASB issued FASB Interpretation No. 48, “Accounting for Uncertainty in Income Taxes” (“FIN 48”). FIN 48 is an interpretation of FASB Statement No. 109, “Accounting for Income Taxes,” and it seeks to reduce the diversity in practice associated with certain aspects of measurement and recognition in accounting for income taxes. In addition, FIN 48 requires expanded disclosure with respect to the uncertainty in income taxes and is effective January 1, 2007 for the Company. The Company is currently evaluating the impact, if any, that FIN 48 will have on the financial statements.

Reclassifications

Certain reclassifications have been made in prior period financial statements to conform to current period presentation. These reclassifications have not resulted in any changes to previously reported net income for any periods.

3.                        Discontinued Operations

Sale of Companies to ALC—On December 31, 2005, the Company sold 2 operations to Automated Logic Corporation and Automated Logic Contracting Services, Inc. (together, “ALC”) for approximately $22.9 million in cash, net of transaction costs and a purchase price adjustment based upon the closing balance sheet for the transferred assets. The receivable related to this sale was paid during the first quarter of 2006. The Company paid $7.0 million in taxes related to this transaction during the first quarter of 2006. The after-tax income of these companies of $0.5 million for the first six months of 2005 has been reported in discontinued operations under “Operating loss, net of income tax benefit (expense).”

Sale of Assets to MESA Energy Systems, Inc.—On June 1, 2006, the Company along with its wholly-owned subsidiary, ARC Comfort Systems USA, Inc. (“ARC”), entered into an asset purchase agreement to sell certain assets of ARC to Mesa Energy Systems, Inc. (a subsidiary of EMCOR Group, Inc.) for approximately $0.7 million in cash. These assets were sold at book value. The Company recorded a tax benefit of $0.2 million during the second quarter of 2006. This is included under the caption “Estimated gain on disposition, net of income tax benefit (expense).”  The Company is in the process of shutting down the remaining operations of ARC. The after-tax loss of this company of $0.9 million and $0.2 million, for the first six months of 2005 and 2006, respectively, has been reported in discontinued operations under “Operating loss, net of income tax benefit (expense).”

Individual Sales of Operating Companies—During the second quarter of 2005, the Company sold a small operating company. The Company recorded a gain on the sale of this unit of $0.1 million, including taxes, in the second quarter of 2005 in discontinued operations under “Estimated gain on disposition, including income tax benefit (expense).”  During the third quarter of 2005, the Company sold one small operating company and shutdown the operations of another small operating company. The after-tax loss of these three companies of $0.7 million for the first six months of 2005, has been reported in discontinued operations under “Operating loss, net of income tax benefit (expense).”

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Assets and liabilities related to discontinued operations are as follows (in thousands):

Revenues and pre-tax loss related to the operations discontinued in 2005 and 2006 were as follows (in thousands):

The Company’s consolidated statements of operations and the related earnings per share amounts have been restated to reflect the effects of the discontinued operations. No interest expense is allocated to discontinued operations.

Sale of Companies to Emcor—In March 2002, the Company sold 19 operations to Emcor Group, Inc. (“Emcor”). The total purchase price was $186.25 million, including the assumption by Emcor of approximately $22.1 million of subordinated notes to former owners of certain of the divested companies. Of Emcor’s purchase price, $5 million was deposited into an escrow account to secure potential obligations on the Company’s part to indemnify Emcor for future claims and contingencies arising from events and circumstances prior to closing, all as specified in the transaction documents. Of this escrow, $4 million has been applied in determining the Company’s liability to Emcor in connection with the settlement of certain claims. The remaining $1 million of escrow is available for book purposes to apply to any future claims and contingencies in connection with this transaction, and has not been recognized as part of the Emcor transaction purchase price.

There are ongoing open matters relating to this transaction that the Company continues to address with Emcor. The Company does not believe these open matters, either individually or in the aggregate, will have a material effect on the Company’s financial position when ultimately resolved. The Company maintains reserves for these matters, net of amounts receivable from escrow that it believes will ultimately be applied in settling these matters.

4.                        Restructuring Charges

The Company recorded restructuring charges of approximately $3.2 million pre-tax in 2003. These charges included approximately $1.5 million for severance costs and retention bonuses primarily associated with the curtailment of the Company’s energy efficiency marketing activities, a reorganization of the Company’s national accounts operations as well as a reduction in corporate personnel. The restructuring charges for this period also included approximately $1.6 million for remaining lease obligations and $0.1

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million of other costs recorded in connection with the actions described above. The Company increased its accrual for these remaining lease obligations by $0.6 million in 2004 and $0.3 million in 2005 based on revised estimates of when and to what extent it believes it can sublease the related facilities. These increases to the accrual were included in “Cost of Services” and in “Selling, General and Administrative Expenses” in the Company’s consolidated statement of operations. Accrued lease termination costs remaining from past restructuring charges are expected to be completed by 2009.

The following table shows the remaining liabilities associated with the cash portion of the restructuring charges as of December 31, 2005 and June 30, 2006 (in thousands):

(a)                                  These charges were included in “Cost of Services” and in “Selling, General and Administrative Expenses” in the Company’s consolidated statement of operations.

5.                        Long-Term Debt Obligations

Long-term debt obligations consist of the following (in thousands):

In June 2005, the Company entered into a $75.0 million senior credit facility (the “Facility”) which is available for borrowings and letters of credit. The Facility is secured by substantially all of the assets of the Company except for assets related to projects subject to surety bonds. The Facility will expire on June 30, 2009. The Company’s borrowing and letter of credit capacity under the Revolving Loan portion of the Facility at any given time is $75.0 million less borrowings and letters of credit outstanding, subject to a borrowing base. As of June 30, 2006, the total of the Facility was $75.0 million, with no outstanding borrowings, $22.1 million in letters of credit outstanding, and $52.9 million of credit available.

The Company has a choice of two interest rate options for borrowings under the Facility; these rates are floating rates determined by the broad financial markets, meaning they can and do move up and down from time to time. The Company estimates that the interest rate applicable to borrowings under the Facility would be approximately 7.33% as of June 30, 2006. Commitment fees of 0.25% per annum are payable on the portion of Revolving Loan capacity not in use for borrowings or letters of credit at any given time.

The Facility contains financial covenants defining various financial measures and the levels of these measures with which the Company must comply. The Facility limits capital expenditures to $20.0 million per year. The Facility also limits payment of dividends and repurchase of shares by the Company to a combined maximum of $20.0 million per year, and otherwise limits non-Facility debt, capital lease obligations, acquisitions, investments, and sales of assets. The Company is in compliance by a substantial margin with all its financial covenants as of June 30, 2006.

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6.                        Commitments and Contingencies

Claims and Lawsuits

The Company is subject to certain claims and lawsuits arising in the normal course of business. The Company maintains various insurance coverages to minimize financial risk associated with these claims. The Company has estimated and provided accruals for probable losses and related legal fees associated with certain of its litigation in the accompanying consolidated financial statements. While the Company cannot predict the outcome of these proceedings, in management’s opinion and based on reports of counsel, any liability arising from these matters individually and in the aggregate will not have a material effect on the Company’s operating results or financial condition, after giving effect to provisions already recorded.

In addition to the matters described above, the Company is defending a dispute arising out of an alleged delay related to a multi-family construction project. If the Company is not successful in this dispute, it could have a material adverse effect on the Company’s operating results. However, management believes the likelihood of an adverse result of this magnitude is remote, and management believes the accruals relating to the matter appropriately reflect a probable outcome.

Surety

Many customers, particularly in connection with new construction, require the Company to post performance and payment bonds issued by a financial institution known as a surety. If the Company fails to perform under the terms of a contract or to pay subcontractors and vendors who provided goods or services under a contract, the customer may demand that the surety make payments or provide services under the bond. The Company must reimburse the sureties for any expenses or outlays they incur. To date, the Company is not aware of any losses to its sureties in connection with bonds the sureties have posted on the Company’s behalf, and does not expect such losses to be incurred in the foreseeable future.

Surety market conditions remain challenging as a result of significant losses incurred by many sureties in recent periods, both in the construction industry as well as in certain larger corporate bankruptcies. As a result, less bonding capacity is available in the market and terms have become more restrictive. Further, under standard terms in the surety market, sureties issue bonds on a project-by-project basis, and can decline to issue bonds at any time. Historically, approximately 30% of the Company’s business has required bonds. While the Company has enjoyed a longstanding relationship with its primary surety and has added another surety to further support its bonding needs, current market conditions as well as changes in the sureties’ assessment of the Company’s operating and financial risk could cause the sureties to decline to issue bonds for the Company’s work. If that were to occur, the alternatives include doing more business that does not require bonds, posting other forms of collateral for project performance such as letters of credit or cash, and seeking bonding capacity from other sureties. The Company would likely also encounter concerns from customers, suppliers and other market participants as to its creditworthiness. While the Company believes its general operating and financial characteristics, including a significant amount of cash on its balance sheet, would enable it to ultimately respond effectively to an interruption in the availability of bonding capacity, such an interruption would likely cause the Company’s revenues and profits to decline in the near term.

Self-Insurance

The Company is substantially self-insured for worker’s compensation, employer’s liability, auto liability, general liability and employee group health claims, in view of the relatively high per-incident deductibles the Company absorbs under its insurance arrangements for these risks. Losses up to deductible amounts are estimated and accrued based upon known facts, historical trends and industry averages. Loss

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estimates associated with the larger and longer-developing risks—worker’s compensation, auto liability and general liability—are reviewed by a third-party actuary quarterly.

The Company’s self-insurance arrangements currently are as follows:

Worker’s Compensation—The per-incident deductible for worker’s compensation is $500,000. Losses above that amount are determined by statutory rules on a state-by-state basis, and are fully covered by excess worker’s compensation insurance.

General and Employer’s Liability—For general liability and employer’s liability, the Company self-insures the first $500,000 of each loss, is fully insured for the next $500,000 of each loss, then has a single, aggregate excess loss insurance policy that covers losses up to $50 million across both these risk areas (as well as auto liability noted below).

Auto Liability—For auto liability, the Company self-insures the first $500,000 of each loss, is fully insured for the next $1.5 million of each loss, then has a single aggregate excess loss insurance policy that covers losses up to $50 million.

Employee Medical—The Company’s per-incident deductible for employee group health claims is $300,000. Insurance then covers any Company responsibility for medical claims in excess of the deductible amount.

It is important to note that the Company’s $50 million of aggregate excess loss coverage above applicable per-incident deductibles represents one policy limit that applies to all lines of risk. In other words, the Company does not have a separate $50 million of excess loss coverage for each of general liability, employer’s liability and auto liability.

7.                        Stockholders’ Equity

Long-Term Incentive Plans

In May 2006, the Company’s stockholders approved the Company’s 2006 Equity Incentive Plan (the “2006 Plan”) which provides for the granting of incentive or non-qualified stock options, stock appreciation rights, restricted or deferred stock, dividend equivalents or other incentive awards to directors, employees and consultants to the Company. The number of shares authorized and reserved for issuance under the 2006 Plan is 3,200,000 shares. The number of shares available under this plan varies with the total number of shares of Common Stock outstanding. As of June 30, 2006, there were 3,200,000 shares available for issuance under this plan. The 2006 Plan will expire in May 2016.

The Company will make all future grants under the 2006 Plan after June 30, 2006.

Stock Options/SAR Plan for Non-Employee Directors

In May 2006, the Company’s stockholders approved the Company’s 2006 Stock Options/SAR Plan for Non-Employee Directors (the “Directors Plan”), which provides for the granting of stock options or stock appreciation rights to non-employees. The number of shares authorized and reserved for issuance under the Directors Plan is 500,000 shares.  Outstanding options may be canceled and reissued under terms specified in the plan. The number of shares available under this plan varies with the total number of shares of Common Stock outstanding. As of June 30, 2006, there were 500,000 shares available for issuance under this plan. The Directors Plan will expire in May 2016.

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Under the Directors Plan, each participant who has served since at least the previous annual meeting and is continuing in office and each newly elected non-employee director will be awarded an award covering 10,000 shares (which will be the maximum number of shares of Common Stock subject to awards that may be granted to any participant in the aggregate in any calendar year). All options will be granted with an exercise price equal to the fair market value at the date of grant and immediately vest upon grant.

The Company will make all future grants under the Directors Plan after June 30, 2006.

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of shares of common stock outstanding during the year. Diluted EPS is computed considering the dilutive effect of stock options, and contingently issuable restricted stock.

Under EPS calculation methods established by generally accepted accounting principles, including the effect of options whose exercise price exceeds the average market price of the Common Stock for a given period would increase calculated EPS. This impact is called “anti-dilutive.”  Generally accepted accounting principles for determining EPS require that any options or other common stock equivalents whose inclusion in determining EPS would have an anti-dilutive effect be excluded. Accordingly, options to purchase less than 0.1 million shares of Common Stock at prices ranging from $16.313 to $21.125 per share which were outstanding for the three months ended June 30, 2006 and options to purchase less than 0.1 million shares at prices ranging from $12.900 to $21.125 per share which were outstanding for the six months ended June 30, 2006, were not included in the computation of diluted EPS because they were anti-dilutive.

Options to purchase 0.7 million shares of Common Stock at prices ranging from $6.97 to $21.438 per share which were outstanding for the three months ended June 30, 2005, and options to purchase 0.5 million shares at prices ranging from $7.625 to $21.438 per shares which were outstanding for the six months ended June 30, 2005, were not included in the computation of diluted EPS because they were anti-dilutive.

The following table reconciles the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share for each of the periods presented (in thousands):

a)   Excludes 295,000 and 248,000 shares of unvested contingently issuable restricted stock outstanding as of June 30, 2005 and 2006, respectively.

8.     Stock-Based Compensation

The Company has various stock-based compensation plans which are administered by the compensation committee of the board of directors. For additional information regarding these plans, refer to “Note 14—Stock Option Plans” of the Notes to the Consolidated Financial Statements contained in the Form 10-K. Prior to January 1, 2006, the Company accounted for those plans under the recognition and

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measurement provisions of APB Opinion No. 25, “Accounting for Stock-Based Compensation.” No stock-based employee compensation cost was recognized in the Consolidated Statements of Operations for the six months ended June 30, 2005, except with respect to the amortization of the intrinsic value of restricted stock grants totaling $0.2 million. Options granted under the Company’s equity compensation plans had an exercise price equal to the market value of the underlying common stock on the date of grant and all terms were fixed, accordingly, no expense was recognized under APB Opinion No. 25. Effective January 1, 2006, the Company adopted the fair value recognition provisions of Financial Accounting Standards Board Statement No. 123(R), Share-Based Payment (FAS 123R), using the modified-prospective-transition method. Results for prior periods have not been restated.

The impact of the adoption of FAS 123R resulted in compensation expense of $0.6 million ($0.4 million after-tax or $0.01 per basic share and $0.01 per diluted share) for the three months ended June 30, 2006. For the first half of 2006, the Company recorded share-based compensation expense of $1.0 million ($0.6 million after-tax or $0.01 per basic share and $0.01 per diluted share).

The following table sets forth pro forma information as if compensation expense for the three and six months ended June 30, 2005 had been determined consistent with the requirements of Statement No. 123. For purposes of this pro forma disclosure, the value of the stock options was estimated using a Black-Scholes option-pricing formula and amortized to expense over the options’ vesting periods (in thousands, except per share amounts):

Prior to adopting Statement 123R, the Company presented the benefits of tax deductions in excess of recognized compensation costs (excess tax benefits) as operating cash flows in the consolidated statements of cash flows. Statement 123R requires these excess tax benefits to be reported as financing cash flows.

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Stock Options—

A summary of option activity under the Company’s stock compensation plans as of June 30, 2006 and changes during the six months ended June 30, 2006 is presented below:

The total intrinsic value of options exercised during the six months ended June 30, 2006 was $5.3 million and the related tax benefit was $2.0 million.

The fair value of each option award is estimated, based on several assumptions, on the date of grant using the Black-Scholes option valuation model. Upon adoption of SFAS No. 123R, the Company modified its methods used to determine these assumptions based on the Securities and Exchange Commission’s Staff Accounting Bulletin No. 107. The fair value and the assumptions used for the 2006 grant are shown in the table below.

Stock options are accounted for as equity instruments, and compensation cost is recognized using straight-line vesting over the four-year vesting period. As of June 30, 2006, the unrecognized compensation cost related to stock options was $1.4 million, which is expected to be recognized over a weighted-average period of 1.5 years. The total fair value of shares vested during the six months ended June 30, 2006 was $0.9 million.

The following table summarizes information about nonvested stock option awards as of June 30, 2006 and changes for the six months ended June 30, 2006:

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The Company generally issues new shares for stock options and restricted stock, unless treasury shares are available.

Restricted Stock—

A summary of restricted stock activity under the Company’s stock compensation plans as of June 30, 2006 and changes during the six months ended June 30, 2006 is presented below:

Approximately $1.0 million of compensation expense related to restricted stock will be recognized over a weighted-average period of 2.1 years. The total fair value of shares vested during the three and six months ended June 30, 2006 was $0.4 million and $0.6 million, respectively.

The fair value of restricted stock shares awarded during the first six months of 2005 and 2006 was $5.58 and $11.07, respectively. The total intrinsic value of restricted stock vested during the six months ended June 30, 2006 was $1.5 million.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion should be read in conjunction with our historical Consolidated Financial Statements and related notes thereto included elsewhere in this Form 10-Q and the Annual Report on Form 10-K as filed with the Securities and Exchange Commission for the year ended December 31, 2005 (the “Form 10-K”). This discussion contains “forward-looking statements” regarding our business and industry within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are based on our current plans and expectations and involve risks and uncertainties that could cause our actual future activities and results of operations to be materially different from those set forth in the forward-looking statements. Important factors that could cause actual results to differ include risks set forth in “Item 1A. Company Risk Factors,” included in our Form 10-K.

Introduction and Overview

We are a national provider of comprehensive heating, ventilation and air conditioning (“HVAC”) installation, maintenance, repair and replacement services within the mechanical services industry. The services we provide address a very broad need, as air is circulated through almost all commercial, industrial and institutional buildings virtually year-round. We operate primarily in the commercial, industrial and institutional HVAC markets and perform most of our services within office buildings, retail centers, apartment complexes, manufacturing plants, and healthcare, education and government facilities. In addition to standard HVAC services, we provide specialized applications such as building automation control systems, fire protection, process cooling, electronic monitoring and process piping. Certain locations also perform related activities such as electrical service and plumbing.

Nature and Economics of Our Business

Approximately 87% of our revenues are earned on a project basis for installation of HVAC systems in newly constructed facilities or for replacement of HVAC systems in existing facilities. Customers hire us to ensure such systems deliver specified or generally expected heating, cooling, conditioning and circulation of air in a facility. This entails installing core system equipment such as packaged heating and air conditioning units, or in the case of larger facilities, separate core components such as chillers, boilers, air handlers, and cooling towers. We also typically install connecting and distribution elements such as piping and ducting. Our responsibilities usually require conforming the systems to pre-established engineering drawings and equipment and performance specifications, which we frequently participate in establishing. Our project management responsibilities include staging equipment and materials to project sites, deploying labor to perform the work, and coordinating with other service providers on the project, including any subcontractors we might use to deliver our portion of the work.

When competing for project business, we usually estimate the costs we will incur on a project, then propose a bid to the customer that includes a contract price and other performance and payment terms. Our bid price and terms are intended to cover our estimated costs on the project and provide a profit margin to us commensurate with the value of the installed system to the customer, the risk that project costs or duration will vary from estimate, the schedule on which we will be paid, the opportunities for other work that we might forego by committing capacity to this project, and other costs that we incur more broadly to support our operations but which are not specific to the project. Typically customers will seek bids from competitors for a given project. While the criteria on which customers select the winning bid vary widely and include factors such as quality, technical expertise, on-time performance, post-project support and service, and company history and financial strength, we believe that price is the most influential factor for most customers in choosing an HVAC installation and service provider.

After a customer accepts our bid, we generally enter into a contract with the customer that specifies what we will deliver on the project, what our related responsibilities are, and how much and when we will

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be paid. Our overall price for the project is typically set at a fixed amount in the contract, although changes in project specifications or work conditions that result in unexpected additional work are usually subject to additional payment from the customer via what are commonly known as change orders. Project contracts typically provide for periodic billings to the customer as we meet progress milestones or incur cost on the project. Project contracts in our industry also frequently allow for a small portion of progress billings or contract price to be withheld by the customer until after we have completed the work, typically for six months. Amounts withheld under this practice are known as retention or retainage.

Labor and overhead costs account for the majority of our cost of service. Accordingly, labor management and utilization have the most impact on our project performance. Given the fixed price nature of much of our project work, if our initial estimate of project costs is wrong or we incur cost overruns that cannot be recovered in change orders, we can experience reduced profits or even significant losses on fixed price project work. We also perform some project work on a cost-plus or a time and materials basis, under which we are paid our costs incurred plus an agreed-upon profit margin. These margins are typically less than fixed-price contract margins because there is less risk of unrecoverable cost overruns in cost-plus or time and materials work.

Our average project takes six to nine months to complete, with an average contract price of approximately $250,000. Our projects generally require working capital funding of equipment and labor costs. Customer payments on periodic billings generally do not recover these costs until late in the job. Our average project duration together with typical retention terms as discussed above generally allow us to complete the realization of revenue and earnings in cash within one year. Because of the integral nature of HVAC and related controls systems to most buildings, we have the legal right in almost all cases to attach liens to buildings or related funding sources when we have not been fully paid for installing systems, except with respect to some government buildings. The service work that we do, which is discussed further below, usually does not give rise to lien rights.

We also perform larger HVAC projects. As of June 30, 2006, we had 4 projects in process with a contract price of between $15 and $25 million, 7 projects between $10 million and $15 million, 48 projects between $5 million and $10 million, and 205 projects between $1 million and $5 million. Taken together, projects with contract prices of $1 million or more totaled $907.3 million of aggregate contract value as of June 30, 2006, or approximately 55%, out of a total contract value for all projects in progress of $1,663.5 million. Generally, projects closer in size to $1 million will be completed in one year or less. It is unusual for us to work on a project that exceeds two years in length.

In addition to project work, approximately 13% of our revenues represent maintenance and repair service on already-installed HVAC and controls systems. This kind of work usually takes from a few hours to a few days to perform. Prices to the customer are usually based on the equipment and materials used in the service as well as technician labor time. We usually bill the customer for service work when it is complete, typically with payment terms of up to thirty days. We also provide maintenance and repair service under ongoing contracts. Under these contracts, we are paid regular monthly or quarterly amounts and provide specified service based on customer requirements. These agreements typically cover periods ranging from one to three years and are cancelable on 30 to 60 days notice.

A relatively small but growing portion of our revenues comes from national and regional account customers. These customers typically have multiple sites, and contract with us to perform maintenance and repair service. These contracts may also provide for us to perform new or replacement systems installation. We operate a national call center to dispatch technicians to sites requiring service. We perform the majority of this work with our own employees, with the balance being subcontracted to third parties that meet our performance qualifications. We will also typically use proprietary information systems to maintain information on the customer’s sites and equipment, including performance and service records, and related cost data. These systems track the status of ongoing service and installation work, and may also

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monitor system performance data. Under these contractual relationships, we usually provide consolidated billing and credit payment terms to the customer.

Profile and Management of Our Operations

We manage our 38 operating units based on a variety of factors. Financial measures we emphasize include profitability, and use of capital as indicated by cash flow and by other measures of working capital principally involving project cost, billings and receivables. We also monitor selling, general, administrative and indirect project support expense, backlog, workforce size and mix, growth in revenues and profits, variation of actual project cost from original estimate, and overall financial performance in comparison to budget and updated forecasts. Operational factors we emphasize include project selection, estimating, pricing, management and execution practices, labor utilization, safety, training, and the make-up of both existing backlog as well as new business being pursued, in terms of project size, technical application and facility type, end-use customers and industries, and location of the work.

Most of our operations compete on a local or regional basis. Attracting and retaining effective operating unit managers is an important factor in our business, particularly in view of the relative uniqueness of each market and operation, the importance of relationships with customers and other market participants such as architects and consulting engineers, and the high degree of competition and low barriers to entry in most of our markets. Accordingly, we devote considerable attention to operating unit management quality, stability, and contingency planning, including related considerations of compensation, and non-competition protection where applicable.

Economic and Industry Factors

As an HVAC and building controls services provider, we operate in the broader nonresidential construction services industry and are affected by trends in this sector. While we do not have operations in all major cities of the US, we believe our national presence is sufficiently large that we experience trends in demand for and pricing of our services that are consistent with trends in the national nonresidential construction sector. As a result, we monitor the views of major construction sector forecasters along with macroeconomic factors they believe drive the sector, including trends in gross domestic product, interest rates, business investment, employment, demographics, and the general fiscal condition of federal, state and local governments.

Spending decisions for building construction, renovation and system replacement are generally made on a project basis, usually with some degree of discretion as to when and if projects proceed. With larger amounts of capital, time, and discretion involved, spending decisions are affected to a significant degree by uncertainty, particularly concerns about macroeconomic and geopolitical trends. We have experienced periods of time, such as after the terrorist incidents on September 11, 2001 in the US, and prior to and during the war in Iraq that occurred in early 2003, when uncertainty caused a significant slowdown in decisions to proceed with installation and replacement project work. We believe that the current economic environment is favorable relative to the activity levels of recent years.

Operating Environment and Management Emphasis

Nonresidential building construction and renovation activity, as reported by the federal government, declined over the three year period of 2001 to 2003, and expanded moderately during 2004 and 2005, and has been relatively strong during the first half of 2006.  During the decline and through 2003, we responded to market challenges by pursuing work in sectors less affected by this downturn, such as government, educational, and health care facilities, and by establishing marketing initiatives that take advantage of our size and range of expertise. We also responded to declining gross profits over those years by reducing our selling, general, and administrative expenses, and our indirect project and service overhead costs. We

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believe our efforts in these areas partially offset the decline in our profitability over that period. We have experienced notable improvements in both industry activity as well as our own results throughout 2004 and 2005, and during the first six months of 2006, as discussed further under “Results of Operations” below.

As a result of our sale of certain assets and our continued strong emphasis on cash flow, our debt outstanding is now zero, and we have substantial uncommitted cash balances, as discussed further in “Liquidity and Capital Resources” below. In June 2005, we put a new credit facility in place with considerably less restrictive terms than those of our previous facilities. In addition, we have added a second surety to further support our bonding needs, and we believe our relationships with the surety markets are positive in light of our strong current results and financial position.  We have generated positive free cash flow in each of the last seven calendar years and will continue our emphasis in this area. See “Liquidity and Capital Resources” below for further discussion of free cash flow. We believe that the relative size and strength of our balance sheet and surety support as compared to most companies in our industry represent competitive advantages for us.

As discussed at greater length in “Results of Operations” below, we have seen increased activity levels in our industry in 2004 and throughout 2005. We expect price competition to continue to be strong, as local and regional competitors respond cautiously to changing conditions. We will continue our efforts to find the more active sectors in our markets, and to increase our regional and national account business. However, our primary emphasis for 2006 will be on internal execution and margin improvement, rather than on revenue growth. In addition to the work we have done on our underperforming units, we have increased our focus on project qualification, estimating, pricing and management, and on service performance. This focus includes significant increases in unit level training.

Based on indications of stabilizing industry conditions and on our emphasis on internal execution and margin improvement, we expect that our 2006 results will be better than our 2005 results, although there can be no assurance that we will achieve this outcome. Over the longer term, if industry conditions are stable to improving, we believe we will experience more periods of increased revenues. In addition, given the size and fragmentation of our industry, we believe it makes sense for us to consider acquisition possibilities. However, we plan to do so on a very selective, opportunistic basis, and expect our growth in 2006 will largely be generated internally.

Critical Accounting Policies

In response to the Commission’s Release No. 33-8040, “Cautionary Advice Regarding Disclosure About Critical Accounting Policies”, we identified our critical accounting policies based upon the significance of the accounting policy to our overall financial statement presentation, as well as the complexity of the accounting policy and our use of estimates and subjective assessments. We have concluded that our most critical accounting policy is our revenue recognition policy. As discussed elsewhere in this report, our business has two service functions: (i) installation, which we account for under the percentage of completion method, and (ii) maintenance, repair and replacement, which we account for as the services are performed, or in the case of replacement, under the percentage of completion method. In addition, we identified other critical accounting policies related to our allowance for doubtful accounts receivable, the recording of our self-insurance liabilities, valuation of deferred tax assets and the assessment of goodwill impairment. These accounting policies, as well as others, are described in Note 2 to the Consolidated Financial Statements included in our Form 10-K.

Percentage of Completion Method of Accounting

Approximately 87% of our revenues were earned on a project basis and recognized through the percentage of completion method of accounting. Under this method as provided by American Institute of Certified Public Accountants Statement of Position 81-1, “Accounting for Performance of

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Construction-Type and Certain Production-Type Contracts,” contract revenue recognizable at any time during the life of a contract is determined by multiplying expected total contract revenue by the percentage of contract costs incurred at any time to total estimated contract costs. More specifically, as part of the negotiation and bidding process in which we engage in connection with obtaining installation contracts, we estimate our contract costs, which include all direct materials (exclusive of rebates), labor and subcontract costs and indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and depreciation costs. These contract costs are included in our results of operations under the caption “Cost of services.”  Then, as we perform under those contracts, we measure such costs incurred, compare them to total estimated costs to complete the contract, and recognize a corresponding proportion of contract revenue. Labor costs are considered to be incurred as the work is performed. Subcontract labor is recognized as the work is performed, but is generally subjected to approval as to milestones or other evidence of completion. Non-labor project cost consists of purchased equipment, prefabricated materials and other materials. Purchased equipment on our projects is substantially produced to job specifications and is a value added element to our work. The costs are considered to be incurred when title is transferred to us, which typically is upon delivery to the worksite. Prefabricated materials, such as ductwork and piping, are generally performed at our shops and recognized as contract costs when fabricated for the unique specifications of the job. Other materials cost are not significant and are generally recorded when delivered to the worksite. This measurement and comparison process requires updates to the estimate of total costs to complete the contract, and these updates may include subjective assessments.

Our contracts typically provide for a schedule of billings or invoices to the customer based on reaching agreed- upon milestones or as we incur costs. The schedules for such billings usually do not precisely match the schedule on which we incur costs. As a result, contract revenues recognized in the statement of operations can and usually do differ from amounts that can be billed or invoiced to the customer at any point during the contract. Amounts by which cumulative contract revenues recognized on a contract as of a given date exceed cumulative billings to the customer under the contract are reflected as a current asset in our balance sheet under the caption “Costs and estimated earnings in excess of billings.”  Amounts by which cumulative billings to the customer under a contract as of a given date exceed cumulative contract revenues recognized on the contract are reflected as a current liability in our balance sheet under the caption “Billings in excess of costs and estimated earnings.”

The percentage of completion method of accounting is also affected by changes in job performance, job conditions, and final contract settlements. These factors may result in revisions to estimated costs and, therefore, revenues. Such revisions are frequently based on further estimates and subjective assessments. We recognize these revisions in the period in which they are determined. If such revisions lead us to conclude that we will recognize a loss on a contract, the full amount of the estimated ultimate loss is recognized in the period we reach that conclusion, regardless of the percentage of completion of the contract.

Revisions to project costs and conditions can give rise to change orders under which the customer agrees to pay additional contract price. Revisions can also result in claims we might make against the customer to recover project variances that have not been satisfactorily addressed through change orders with the customer. Except in certain circumstances, we do not recognize revenues or margin based on change orders or claims until they have been agreed upon with the customer. The amount of revenue associated with unapproved change orders and claims is currently immaterial. Variations from estimated project costs could have a significant impact on our operating results, depending on project size, and the recoverability of the variation via additional customer payments.

Accounting for Allowance for Doubtful Accounts

We are required to estimate the collectibility of accounts receivable and provide an allowance for doubtful accounts for receivable amounts we believe we will not ultimately collect. This requires us to

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make certain judgments and estimates involving,  among others, the creditworthiness of the customer, our prior collection history with the customer, ongoing relationships with the customer, the aging of past due balances, our lien rights, if any, in the property where we performed the work, and the availability, if any, of payment bonds applicable to our contract. These estimates are re-evaluated and adjusted as additional information is received.

Accounting for Self-Insurance Liabilities

We are substantially self-insured for worker’s compensation, employer’s liability, auto liability, general liability and employee group health claims in view of the relatively high per-incident deductibles we absorb under our insurance arrangements for these risks. Losses up to deductible amounts are estimated and accrued based upon known facts, historical trends and industry averages. Loss estimates associated with the larger and longer-developing risks—worker’s compensation, auto liability and general liability—are reviewed by a third party actuary quarterly. We believe these accruals are adequate. However, insurance liabilities are difficult to estimate due to unknown factors, including the severity of an injury, the determination of our liability in proportion to other parties, timely reporting of occurrences, ongoing treatment or loss mitigation, general trends in litigation recovery outcomes and the effectiveness of safety and risk management programs. Therefore, if actual experience differs from the assumptions and estimates used for recording the liabilities, adjustments may be required and would be recorded in the period that such experience becomes known.

Accounting for Deferred Tax Assets

We regularly evaluate valuation allowances established for deferred tax assets for which future realization is uncertain. We perform this evaluation quarterly. Estimations of required valuation allowances include estimates of future taxable income. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which the activity underlying these assets becomes deductible. We consider projected future taxable income and tax planning strategies in making this assessment. If actual future taxable income is less than the estimates, we may not realize all or a portion of the deferred tax assets.

Accounting for Goodwill and Other Intangible Assets

In most businesses we have acquired, the value we paid to buy the business was greater than the value of specifically identifiable net assets in the business. Under generally accepted accounting principles, this excess is termed goodwill and is recognized as an asset at the time the business is acquired. It is generally expected that future net earnings from an acquired business will exceed the goodwill asset recognized at the time the business is bought.

Statement of Financial Accounting Standards (“SFAS”) No. 142, “Goodwill and Other Intangible Assets” requires us to assess our goodwill asset amounts for impairment each year, and more frequently if circumstances suggest an impairment may have occurred. Impairment must be reflected when the value of a given business unit in excess of its tangible net assets falls below the goodwill asset balance carried for that unit on our books. If other business units have had increases in the value of their respective goodwill balances, such increases may not be recorded under SFAS No. 142. Accordingly, such increases may not be netted against impairments at other business units. The requirements for assessing whether goodwill assets have been impaired involve market-based information. This information, and its use in assessing goodwill, entails some degree of subjective assessment.

We currently perform our annual impairment testing as of October 1 and any impairment charges resulting from this process are reported in the fourth quarter. We segregated our operations into reporting units based on the degree of operating and financial independence of each unit and our related

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management of them. These reporting units are tested for impairment by comparing the unit’s fair value to its carrying value. The fair value of each reporting unit was estimated using a discounted cash flow model combined with market valuation approaches. Significant estimates and assumptions are used in assessing the fair value of reporting units. These estimates and assumptions involved future cash flows, growth rates, discount rates, weighted average cost of capital and estimates of market valuations for each of the reporting units.

Results of Operations (in thousands):

Table 1—Historical Results