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
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

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 (MM/DD/YYYY)

3/7/2018
(Street)

HOUSTON, TX 77057
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   3/7/2018     A    2551   (1) A $0   43211   D    
Common Stock   3/7/2018     A    5573   (2) A $0   48784   D    
Common Stock   3/7/2018     F    2108   (3) D $42.50   46676   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 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)   $42.50   3/7/2018     A      8310       4/1/2019   (4) 3/7/2028   (5) Common Stock   8310   $0   8310   D    

Explanation of Responses:
(1)  Each restricted stock unit granted on March 7, 2018 represents the 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 25, 2015 that vested on March 7, 2018. These units vested as a result of the Company's 2015-2017 relative Total Shareholder Return and 2015-2017 Company average EPS - the applicable performance metrics.
(3)  Forfeited shares are related to dollar-denominated performance restricted stock units that vested on March 7, 2018 and were priced based on the closing price of the Company's common stock on March 7, 2018.
(4)  Stock options vest in equal installments over a three-year vesting schedule.
(5)  Stock options will expire at the earlier of ten years from the date of grant or three months following termination of employment.

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 3/9/2018
** 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 control number.
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