<SEC-DOCUMENT>0001949846-25-000550.txt : 20251029
<SEC-HEADER>0001949846-25-000550.hdr.sgml : 20251029
<ACCEPTANCE-DATETIME>20251029154347
ACCESSION NUMBER:		0001949846-25-000550
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251029
DATE AS OF CHANGE:		20251029

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COMFORT SYSTEMS USA INC
		CENTRAL INDEX KEY:			0001035983
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRICAL WORK [1731]
		ORGANIZATION NAME:           	05 Real Estate & Construction
		EIN:				760526487
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-13011
		FILM NUMBER:		251429780

	BUSINESS ADDRESS:	
		STREET 1:		9753 KATY FREEWAY
		STREET 2:		SUITE 700
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77024
		BUSINESS PHONE:		7138309600

	MAIL ADDRESS:	
		STREET 1:		9753 KATY FREEWAY
		STREET 2:		SUITE 700
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77024

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BULLS HERMAN E
		CENTRAL INDEX KEY:			0001205068
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		C/O COMFORT SYSTEMS USA, INC.
		STREET 2:		9753 KATY FREEWAY, SUITE 700
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77024
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001205068</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001035983</issuerCik>
      <issuerName>COMFORT SYSTEMS USA INC</issuerName>
      <secFileNumber>001-13011</secFileNumber>
      <issuerAddress>
        <com:street1>9753 KATY FREEWAY</com:street1>
        <com:street2>SUITE 700</com:street2>
        <com:city>HOUSTON</com:city>
        <com:stateOrCountry>TX</com:stateOrCountry>
        <com:zipCode>77024</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>7138309600</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>BULLS HERMAN E</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>2000</noOfUnitsSold>
      <aggregateMarketValue>2027221.76</aggregateMarketValue>
      <noOfUnitsOutstanding>5851415</noOfUnitsOutstanding>
      <approxSaleDate>10/29/2025</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/29/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Equity Compensation</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>2000</amountOfSecuritiesAcquired>
      <paymentDate>05/29/2021</paymentDate>
      <natureOfPayment>Services Rendered</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Herman E Bulls</name>
        <address>
          <com:street1>9753 KATY FREEWAY</com:street1>
          <com:street2>SUITE 700</com:street2>
          <com:city>Houston</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>77024</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>08/27/2025</saleDate>
      <amountOfSecuritiesSold>3000</amountOfSecuritiesSold>
      <grossProceeds>2129974.51</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>Shares to be sold out of account registered: The Herman E Bulls Revocable Trust U/A DTD 03/17/2016</remarks>
    <noticeSignature>
      <noticeDate>10/29/2025</noticeDate>
      <signature>Herman E Bulls</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
