    <SEC-DOCUMENT>0001558370-19-002998-index.html : 20190415
    <SEC-HEADER>0001558370-19-002998.hdr.sgml : 20190415
    <ACCEPTANCE-DATETIME>20190415160202
    ACCESSION NUMBER:		0001558370-19-002998
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		14
    CONFORMED PERIOD OF REPORT:	20181231
    FILED AS OF DATE:		20190415
    DATE AS OF CHANGE:		20190415
    EFFECTIVENESS DATE:		20190415

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			COMFORT SYSTEMS USA INC
    		CENTRAL INDEX KEY:			0001035983
    		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRICAL WORK [1731]
    		IRS NUMBER:				760526487
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-13011
    		FILM NUMBER:		19748618

    	BUSINESS ADDRESS:
    		STREET 1:		675 BERING DRIVE
    		STREET 2:		SUITE 400
    		CITY:			HOUSTON
    		STATE:			TX
    		ZIP:			77057
    		BUSINESS PHONE:		7138309600

    	MAIL ADDRESS:
    		STREET 1:		675 BERING DRIVE
    		STREET 2:		SUITE 400
    		CITY:			HOUSTON
    		STATE:			TX
    		ZIP:			77057
    </SEC-HEADER>
    <DOCUMENT>
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    <SEQUENCE>1
    <FILENAME>fix-20190415x10k.htm
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: fix-20190415x10k.htm

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    <TEXT>
    Document 2 - file: fix20190415x10k001.gif

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    <FILENAME>fix20190415x10k002.gif
    <TEXT>
    Document 3 - file: fix20190415x10k002.gif

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    <SEQUENCE>4
    <FILENAME>fix20190415x10k003.gif
    <TEXT>
    Document 4 - file: fix20190415x10k003.gif

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    <SEQUENCE>5
    <FILENAME>fix20190415x10k004.gif
    <TEXT>
    Document 5 - file: fix20190415x10k004.gif

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    <FILENAME>fix20190415x10k005.gif
    <TEXT>
    Document 6 - file: fix20190415x10k005.gif

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    <FILENAME>fix20190415x10k006.gif
    <TEXT>
    Document 7 - file: fix20190415x10k006.gif

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    <SEQUENCE>8
    <FILENAME>fix20190415x10k007.gif
    <TEXT>
    Document 8 - file: fix20190415x10k007.gif

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    <SEQUENCE>9
    <FILENAME>fix20190415x10k008.gif
    <TEXT>
    Document 9 - file: fix20190415x10k008.gif

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    <FILENAME>fix20190415x10k009.gif
    <TEXT>
    Document 10 - file: fix20190415x10k009.gif

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    <FILENAME>fix20190415x10k010.gif
    <TEXT>
    Document 11 - file: fix20190415x10k010.gif

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    <FILENAME>fix20190415x10k011.jpg
    <TEXT>
    Document 12 - file: fix20190415x10k011.jpg

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    <SEQUENCE>13
    <FILENAME>fix20190415x10k012.gif
    <TEXT>
    Document 13 - file: fix20190415x10k012.gif

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    <FILENAME>fix20190415x10k013.gif
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    Document 14 - file: fix20190415x10k013.gif

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