EX-21.1 3 fix-20231231xex21d1.htm EX-21.1

EXHIBIT 21.1

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SUBSIDIARIES OF COMFORT SYSTEMS USA, INC.

as of December 31, 2023

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ENTITY NAME |  | DOMESTIC JURISDICTION |  | FORMATION DATE |
--- | --- | --- | --- | --- | ---
ACI Mechanical, Inc. | ​ | Delaware | ​ | 06/26/1998 | ​
Air Systems Engineering, Inc. | ​ | Washington | ​ | 05/18/1973 | ​
AirTemp, Inc. | ​ | Maine | ​ | 10/15/1998 | ​
Altrax Tool and Equipment Co LLC | ​ | Tennessee | ​ | 12/03/2018 | ​
Amteck Holdco LLC | ​ | Delaware | ​ | 11/07/2018 | ​
Amteck Sprinkler LLC | ​ | Delaware | ​ | 01/25/2018 | ​
Amteck, LLC | ​ | Kentucky | ​ | 06/15/1999 | ​
Armani East LLC | ​ | New York | ​ | 12/03/2018 | ​
Associated Boiler Systems, Inc. | ​ | Indiana | ​ | 12/17/2013 | ​
Atlantic Electric, LLC | ​ | South Carolina | ​ | 12/20/2002 | ​
BCH Holdings, Inc. | ​ | Florida | ​ | 12/28/2004 | ​
BCH Leasing, LLC | ​ | Florida | ​ | 10/25/1990 | ​
BCH Mechanical, L.L.C. | ​ | Florida | ​ | 10/19/1976 | ​
BCM Controls Corporation | ​ | Massachusetts | ​ | 10/03/1984 | ​
Billone West LLC | ​ | New York | ​ | 12/03/2018 | ​
Brick & Mortar Ventures II, L.P. | ​ | Delaware | ​ | 01/12/2021 | ​
ColonialWebb Contractors Company | ​ | Virginia | ​ | 03/30/1972 | ​
Comfort Systems USA (Arkansas), Inc. | ​ | Arkansas | ​ | 03/17/1998 | ​
Comfort Systems USA (Central Texas), Inc. | ​ | Texas | ​ | 05/24/2007 | ​
Comfort Systems USA (Intermountain), Inc. | ​ | Utah | ​ | 05/06/1969 | ​
Comfort Systems USA (Kentucky), Inc. | ​ | Kentucky | ​ | 02/10/1981 | ​
Comfort Systems USA (Mid South), Inc. | ​ | Alabama | ​ | 08/08/1998 | ​
Comfort Systems USA (MidAtlantic), LLC | ​ | Virginia | ​ | 01/01/2010 | ​
Comfort Systems USA (Northwest), Inc. | ​ | Washington | ​ | 02/14/1984 | ​
Comfort Systems USA (Ohio), Inc. | ​ | Ohio | ​ | 10/10/1979 | ​
Comfort Systems USA (South Central), Inc. | ​ | Texas | ​ | 05/24/2007 | ​
Comfort Systems USA (Southeast), Inc. | ​ | Delaware | ​ | 03/24/1998 | ​
Comfort Systems USA (Southwest), Inc. | ​ | Arizona | ​ | 12/23/1977 | ​
Comfort Systems USA (Syracuse), Inc. | ​ | New York | ​ | 03/08/1965 | ​
Comfort Systems USA (Texas), L.P. | ​ | Texas | ​ | 08/14/1998 | ​
Comfort Systems USA G.P., Inc. | ​ | Delaware | ​ | 08/12/1998 | ​
Comfort Systems USA Strategic Accounts, LLC | ​ | Indiana | ​ | 07/28/1998 | ​
ConServ Building Services of Alabama, LLC | ​ | Alabama | ​ | 12/28/2012 | ​
ConServ Building Services of Georgia, LLC | ​ | Georgia | ​ | 11/04/2008 | ​
ConServ Building Services of North Carolina, LLC | ​ | North Carolina | ​ | 03/22/2010 | ​
ConServ Building Services of Tennessee, LLC | ​ | Tennessee | ​ | 01/07/2010 | ​
ConServ Building Services of Texas, LLC | ​ | Texas | ​ | 01/22/2010 | ​
ConServ Building Services, LLC | ​ | Florida | ​ | 01/05/2005 | ​
Control Concepts Mechanical Services, LLC | ​ | Georgia | ​ | 01/17/2008 | ​
Control Concepts, LLC | ​ | Georgia | ​ | 12/16/1996 | ​
CSUSA (10), LLC | ​ | North Carolina | ​ | 10/21/2011 | ​
DECCO, Inc. | ​ | Massachusetts | ​ | 05/01/1999 | ​
Design Mechanical Incorporated | ​ | Colorado | ​ | 11/25/2003 | ​
Dilling Group, Inc. | ​ | Indiana | ​ | 12/14/1984 | ​
Dilling, LLC | ​ | Indiana | ​ | 12/29/1998 | ​
Dyna Ten Corporation | ​ | Texas | ​ | 06/26/1980 | ​
E Solutions LLC | ​ | Indiana | ​ | 06/17/2009 | ​
Eastern Heating & Cooling, Inc. | ​ | New York | ​ | 12/19/1988 | ​

ENTITY NAME |  | DOMESTIC JURISDICTION |  | FORMATION DATE |
--- | --- | --- | --- | --- | ---
Dilling Group, Inc. | ​ | Indiana | ​ | 12/14/1984 | ​
Edwards Electrical & Mechanical, Inc. | ​ | Indiana | ​ | 02/28/1968 | ​
Eldeco, Inc. | ​ | South Carolina | ​ | 09/05/1972 | ​
Environmental Air Systems, LLC | ​ | North Carolina | ​ | 10/07/2011 | ​
Envirotrol, LLC | ​ | North Carolina | ​ | 10/28/2011 | ​
F. W. Dilling, LLC | ​ | Indiana | ​ | 12/06/1999 | ​
Granite State Holdings Company, Inc. | ​ | Delaware | ​ | 11/03/2005 | ​
Granite State Plumbing & Heating, LLC | ​ | New Hampshire | ​ | 07/31/2001 | ​
Hayes & Lunsford Electric, LLC | ​ | South Carolina | ​ | 06/01/2018 | ​
Hess Mechanical, LLC | ​ | Maryland | ​ | 12/31/2015 | ​
HVACRedu.net LLC | ​ | Montana | ​ | 01/01/2007 | ​
Ivey Mechanical Company, LLC | ​ | Mississippi | ​ | 12/02/2002 | ​
Kodiak Labor Solutions, LLC | ​ | Delaware | ​ | 12/04/2017 | ​
MEP Holding Co., Inc. | ​ | Indiana | ​ | 09/01/2006 | ​
MJ Mechanical Services, Inc. | ​ | Virginia | ​ | 12/12/1997 | ​
N471VY Trust | ​ | Utah | ​ | 12/01/2021 | ​
North American Mechanical, Inc. | ​ | Delaware | ​ | 03/17/1998 | ​
OFF, LLC | ​ | Indiana | ​ | 11/22/2002 | ​
Post Oak Insurance Co. Ltd. | ​ | Cayman Islands | ​ | 10/04/2019 | ​
Premier Prefabrication Solutions, LLC | ​ | Texas | ​ | 01/16/2018 | ​
Quality Air Heating & Cooling, Inc. | ​ | Michigan | ​ | 09/10/1980 | ​
Riddleberger Brothers, Inc. | ​ | Virginia | ​ | 12/22/1958 | ​
Royalaire Holdings, LLC | ​ | Florida | ​ | 03/22/2006 | ​
Royalaire Mechanical Services, LLC | ​ | Florida | ​ | 09/12/2006 | ​
S.I. Goldman Company, Inc. | ​ | Florida | ​ | 10/04/1976 | ​
S.M. Lawrence Company, Inc. | ​ | Tennessee | ​ | 03/08/1973 | ​
Seasonair, LLC | ​ | Maryland | ​ | 10/28/1966 | ​
ShoffnerKalthoff MES, Inc. | ​ | Tennessee | ​ | 05/18/2005 | ​
Starr Electric Company, Incorporated | ​ | North Carolina | ​ | 07/27/1942 | ​
TAS Energy Inc. | ​ | Delaware | ​ | 04/30/2010 | ​
TAS Modular Data Limited | ​ | Ireland | ​ | 11/20/2019 | ​
Temp Right Service, Inc. | ​ | Delaware | ​ | 09/25/1997 | ​
Tennessee Electric Company, Inc. | ​ | Tennessee | ​ | 06/02/1961 | ​
TES Controls, LLC | ​ | Kentucky | ​ | 12/10/2015 | ​
Thermal Service, LLC | ​ | Kentucky | ​ | 05/16/2008 | ​
Trinity Contractors, LLC | ​ | Alabama | ​ | 05/15/2017 | ​
Trumbo Electric, Incorporated | ​ | Virginia | ​ | 06/02/1966 | ​
Walker Electrical Contractors, LLC | ​ | Texas | ​ | 03/23/2010 | ​
Walker Engineering, Inc. | ​ | Texas | ​ | 01/29/2002 | ​
Walker Industrial, LLC | ​ | Texas | ​ | 12/12/2014 | ​
Western States Mechanical, Inc. | ​ | Utah | ​ | 03/05/1990 | ​

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