EXHIBIT 21.1
SUBSIDIARIES OF COMFORT SYSTEMS USA, INC.
as of December 31, 2025
ENTITY NAME | | DOMESTIC | | FORMATION |
|
|---|---|---|---|---|---|
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 | |
Brick & Mortar Ventures III, L.P. | | Delaware | | 01/22/2025 | |
Bright’s Systems Incorporated | | New York | | 10/22/1993 | |
Century Contractors, LLC | | North Carolina | | 12/15/1975 | |
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 Shoffner, Inc. | | Tennessee | | 08/18/2005 | |
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, LLC | | Florida | | 01/05/2005 | |
Control Concepts Mechanical Services, LLC | | Georgia | | 01/17/2008 | |
Control Concepts, LLC | | Georgia | | 12/16/1996 | |
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 | |
ENTITY NAME | | DOMESTIC | | FORMATION |
|
|---|---|---|---|---|---|
Dilling Group, Inc. | | Indiana | | 12/14/1984 | |
E Solutions LLC | | Indiana | | 06/17/2009 | |
Eastern Heating & Cooling, Inc. | | New York | | 12/19/1988 | |
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 | |
Feyen-Zylstra, LLC | | Michigan | | 12/08/2003 | |
Feyen-Zylstra Holdings, LLC | | Michigan | | 09/14/2021 | |
F. W. Dilling, LLC | | Indiana | | 12/06/1999 | |
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 | | Idaho | | 01/01/2007 | |
Ivey Mechanical Company, LLC | | Mississippi | | 12/02/2002 | |
J & S Mechanical Contractors, Inc. | | Utah | | 05/07/1976 | |
Kodiak Labor Solutions, LLC | | Delaware | | 12/04/2017 | |
Meisner Electric, Inc. | | Florida | | 07/01/1983 | |
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 | |
Precision Plumbing and Service, LLC | | Delaware | | 10/06/2020 | |
Premier Prefabrication Solutions, LLC | | Texas | | 01/16/2018 | |
Quality Air Heating & Cooling, Inc. | | Michigan | | 09/10/1980 | |
Riddleberger Brothers, Inc. | | Virginia | | 12/22/1958 | |
Right Way Plumbing & Mechanical LLC | | Florida | | 06/12/1931 | |
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 | |
Smith Farm Properties, LLC | | North Carolina | | 03/22/2022 | |
Starr Electric Company, Incorporated | | North Carolina | | 07/27/1942 | |
Summit Industrial Construction, LLC | | Delaware | | 07/25/2011 | |
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 | |