SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Lane Brian E. (Last) (First) (Middle) C/O COMFORT SYSTEMS USA, INC. 675 BERING DRIVE, SUITE 400 (Street) HOUSTON TX 77057 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol COMFORT SYSTEMS USA INC [ FIX ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner X Officer (give title below) Other (specify below) President/Chief Executive Off.
	3. Date of Earliest Transaction (Month/Day/Year) 03/06/2019
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/06/2019		A		17,774(1)	A	$0	216,620	D
Common Stock	03/06/2019		A		12,398(2)	A	$0	229,018	D
Common Stock	03/06/2019		F		4,879(3)	D	$52.04	224,139	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Each restricted stock unit granted on March 6, 2019 represents a right to receive one share of common stock and will vest in equal installments over a three-year vesting schedule.

2. Reflects dollar-denominated performance restricted stock units granted on March 23, 2016 that vested on March 6, 2019. These units vested as a result of the Company's 2016-2018 relative Total Shareholder Return and 2016-2018 Company average EPS - the applicable performance measures.

3. Forfeited shares are related to dollar-denominated performance restricted stock units that vested on March 6, 2019 and were priced based on the closing price of the Company's common stock on March 6, 2019.

	/s/ Laura F. Howell, by power of attorney	03/08/2019
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Limited Power of Attorney for Section 16 Reporting Obligations

The undersigned hereby makes, constitutes, and appoints Laura F.
Howell and Rachel J. Reagor, each acting individually, as the
undersigned's true and lawful attorney-in-fact, with full power
and authority as hereinafter described on behalf of and in the
name, place, and stead of the undersigned to:

     1)prepare, execute, acknowledge, deliver, and file Forms 3,
4, and 5 (including any amendments thereto) with respect to the
securities of Comfort Systems USA, Inc., a Delaware corporation
(the "Company"), with the United States Securities and Exchange
Commission, any national securities exchanges, and the Company,
as considered necessary or advisable under Section 16(a) of the
Securities Exchange Act of 1934 and the rules and regulations
promulgated thereunder, as amended from time to time (the
"Exchange Act");

     2)seek or obtain, as the undersigned's representative and on
the undersigned's behalf, information on transactions in the
Company's securities from any third party, including brokers,
employee benefit plan administrators, and trustees, and the
undersigned hereby authorizes any such person to release any such
information to the attorney-in-fact and approves and ratifies any
such release of information; and
     3)perform any and all other acts that, in the discretion of
such attorney-in-fact, are necessary or desirable for and on
behalf of the undersigned in connection with the foregoing.

The undersigned acknowledges that:

     1)this Power of Attorney authorizes, but does not require,
such attorney-in-fact to act in his or her discretion on
information provided to such attorney-in-fact without independent
verification of such information;

     2)any documents prepared and/or executed by such attorney-
in-fact on behalf of the undersigned pursuant to this Power of
Attorney will be in such form and will contain such information
and disclosure as such attorney-in-fact, in his or her
discretion, deems necessary or desirable;

     3)neither the Company nor such attorney-in-fact assumes (i)
any liability for the undersigned's responsibility to comply with
the requirement of the Exchange Act, (ii) any liability of the
undersigned for any failure to comply with such requirements, or
(iii) any obligation or liability of the undersigned for profit
disgorgement under Section 16(b) of the Exchange Act; and

     4)this Power of Attorney does not relieve the undersigned
from responsibility for compliance with the undersigned's
obligations under the Exchange Act, including without limitation
the reporting requirements under Section 16 of the Exchange Act.
The undersigned hereby gives and grants the foregoing attorney-
in-fact full power and authority to do and perform all and every
act and thing whatsoever requisite, necessary, or appropriate to
be done in and about the foregoing matters as fully to all
intents and purposes as the undersigned might or could do if
present, hereby ratifying all that such attorney-in-fact of, for,
or on behalf of the undersigned, shall lawfully do or cause to be
done by virtue of this Limited Power of Attorney.

This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4,
and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier
revoked by the undersigned in a signed writing delivered to the
foregoing attorney-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed in Harris County, Texas as of this 6th
date of March, 2019.

/s/ Brian E. Lane_______________________
Brian E. Lane