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* Shaeff Julie (Last) (First) (Middle) C/O COMFORT SYSTEMS USA, INC. 675 BERING DR. 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) Director 10% Owner X Officer (give title below) Other (specify below) Chief Accounting Officer
	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		2,286(1)	A	$0	27,876	D
Common Stock	03/06/2019		A		2,677(2)	A	$0	30,553	D
Common Stock	03/06/2019		F		1,022(3)	D	$52.04	29,531	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 metrics.

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/ Julie S. Shaeff__________________________
Julie S. Shaeff