FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person * Trent T McKenna   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) SrVP, General Counsel and Secy (Last) (First) (Middle) C/O COMFORT SYSTEMS USA, INC., 675 BERING DRIVE, SUITE 400 3. Date of Earliest Transaction (Month/Day/Year) 03/25/2015 (Street) HOUSTON, TX 77057 4. If Amendment, Date 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 (City) (State) (Zip) 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 03/25/2015   A   4,926 (1) A $ 0 45,284 D   Common Stock 04/01/2015   A   8,591 (2) A $ 0 53,875 D   Common Stock 04/02/2015(3)   F   673 (4) D $ 21.04 (5) 53,203 D   Common Stock 04/02/2015(3)   F   544 (6) D $ 21.04 (5) 52,659 D   Common Stock 04/02/2015(3)   F   481 (7) D $ 21.04 (5) 52,178 D   Common Stock 04/02/2015(3)   F   2,272 (8) D $ 21.04 (5) 49,906 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	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 control number.		SEC 1474 (9-02)

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 Underlying Securities (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 of Derivative Security: 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

Employee Stock Option (Right to Buy)

$ 19.67

03/25/2015

A

12,717

04/01/2016(9)

03/25/2025(10)

Common Stock

12,717

$ 0

12,717

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Trent T McKenna C/O COMFORT SYSTEMS USA, INC. 675 BERING DRIVE, SUITE 400 HOUSTON, TX 77057			SrVP, General Counsel and Secy

Signatures

/s/ Trent T. McKenna		04/02/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Each restricted stock unit granted on March 25, 2015 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 26, 2012 that vested on April 1, 2015. These units vested as a result of the Company's 2012-2014 relative Total Shareholder Return and 2012-2014 Company average EPS-the applicable performance metrics.
(3)	Forfeited shares are related to dollar-denominated performance restricted stock units and restricted stock units that vested on April 1,2015 and were priced based on the average of the high and low stock price on April 1, 2015. Forfeitures were processed on April 2, 2015.
(4)	Reflects forfeited shares related to the third and final vesting of restricted stock units granted on March 26, 2012.
(5)	Price is based on the average of the high and low stock price on April 1, 2015.
(6)	Reflects forfeited shares related to the second vesting of restricted stock units granted on March 20, 2013.
(7)	Reflects forfeited shares related to the first vesting of restricted stock units granted on March 19, 2014.
(8)	Reflects forfeited shares related to the vesting of dollar-denominated performance restricted stock units granted on March 26, 2012.
(9)	Stock options vest in equal installments over a three-year vesting schedule.
(10)	Stock options will expire at the earlier of ten years from the date of grant or three months following termination of employment.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.