| 20 / 20 Plumbing & Heating Inc | C20 | 2015 | Active |
| A P S Construction Inc | C20 | 2007 | Active |
| Aaa Plumbing Heating And Air Conditioning Inc | C20 | 2024 | Active |
| AC & Refrigeration Comfort Inc | C20, C38 | 2022 | Active |
| AC Flo HVAC LLC | C20 | 2025 | Active |
| Accufix Temp Control | C20 | 2025 | Active |
| Ace Home Heating & Air Conditioning LLC | C20 | 2018 | Active |
| Advance Refrigeration & Ice Systems Inc | C38 | 1998 | Active |
| Air Design & Solutions Inc | C20 | 2017 | Active |
| Aire Serv Of Corona | C20 | 2026 | Active |
| All American Construction | C20 | 2021 | Active |
| All In 1 Heating And Air Conditioning Inc | C20 | 2016 | Active |
| All Plumbing & Air Solutions | C20 | 2015 | Active |
| All Star Mechanical Heating & Cooling | C20 | 2025 | Active |
| American Cooling | C20 | 2024 | Active |
| Ameriwest Heating And Cooling | C20 | 2022 | Active |
| Ata Construction Services | C20 | 2012 | Active |
| Bom Construction Inc | C20 | 2015 | Active |
| Cardinal Sheet Metal Inc | C20 | 1996 | Active |
| CBMS Corp | C20 | 2026 | Active |
| Central Air Conditioning And Heating | C20 | 1991 | Active |
| Central Aire Heating & Air Conditioning Service Inc | C20 | 2004 | Active |
| Central Aire Inc | C20 | 2026 | Active |
| Cold Air Technologies Inc | C38 | 2014 | Active |
| Covello's Pacific Air Care Inc | C20 | 2009 | Active |
| Delo Air | C20 | 2006 | Active |
| Direct AC Inc | C20 | 2009 | Active |
| Dragonfly Heating And Cooling | C20, C38 | 2009 | Active |
| Dynamic Air Conditioning And Heating | C20 | 2015 | Active |
| Eco Tec Air Services Inc | C20 | 2017 | Active |
| Electrocool Solutions Inc | C20 | 2000 | Active |
| Elite Airflow Mechanical Inc | C20, C38 | 2016 | Active |
| Empire Custom Cooling Inc | C20 | 2022 | Active |
| Even Flow Heating & Air Inc | C20 | 2008 | Active |
| Facilities H V A C Services Inc | C20 | 2019 | Active |
| Family Ties Air Plumbing And Drain | C20 | 2022 | Active |
| First Choice Plumbing Heating & Air Conditioning Inc | C20 | 1969 | Active |
| First Class Plumbing & Rooter Services Inc | C20 | 2021 | Active |
| Get Comfort Air | C20 | 2026 | Active |
| Good Air AC & Heat | C20 | 2022 | Active |
| Guyou Construction Inc | C20 | 2014 | Active |
| Hasco Heating Airconditioning Service Company Inc | C20, C38 | 1987 | Active |
| Heating And Cooling Matters LLC | C20 | 2025 | Active |
| Henson And Son's Heating And Cooling LLC | C20 | 2024 | Active |
| High Performance Air Inc | C20 | 2003 | Active |
| Hillside Heating & Air Conditioning Inc | C20 | 1989 | Active |
| Holloway Air Systems | C20 | 2009 | Active |
| Hush Air | C20 | 1991 | Active |
| I E Comfort Inc | C20 | 2019 | Active |
| Icebox HVAC Solutions | C20 | 2024 | Active |
| Inland Climate Control | C20 | 2017 | Active |
| Interstate Air Quality Inc | C20 | 1995 | Active |
| Iwatcher Plus | C20 | 2019 | Active |
| J J Heating And Air Inc | C20 | 2019 | Active |
| J V S Refrigeration Inc | C20, C38 | 1991 | Renew by Nov 30, 2026 |
| J.Adams Air Conditioning Heating And Plumbing Corp | C20 | 2024 | Active |
| Jbe Air Solutions Inc | C20 | 2023 | Active |
| JJ Air Inc | C20 | 2017 | Active |
| Johnson J D Heating And Air Inc | C20 | 2018 | Active |
| Jyj Air Conditioning Inc | C20 | 2025 | Active |
| KB Climate Services Inc | C20 | 2025 | Active |
| Lavang Controls Corp | C20 | 2005 | Active |
| Lce Telecom Inc | C20 | 2017 | Active |
| M B Plumbing Air Conditioning & Heating Inc | C20 | 1995 | Active |
| Macias Refrigeration Inc | C38 | 2004 | Active |
| Magnolia Heating & Cooling Inc | C20 | 2002 | Renew by Nov 30, 2026 |
| Marin Air LLC | C20 | 2025 | Active |
| Mechanical Air Control Inc | C20 | 2002 | Active |
| MHC Group LLC | C20 | 2026 | Active |
| Mi Clima Air Conditioning And Heating Inc | C20 | 2024 | Active |
| Mills Air Conditioning & Heating Inc | C20 | 1983 | Active |
| Modern Comfort And Air Inc | C20 | 2023 | Active |
| Modern Construction Services | C20 | 1983 | Active |
| MSP Heating And Air LLC | C20 | 2018 | Active |
| MTZ HVAC Services | C20 | 2026 | Active |
| National Refrigeration Services LLC | C20, C38 | 2023 | Active |
| Navarro's Brothers Heating & Air Conditioning | C20 | 2026 | Active |
| Nir Plumbing Inc | C20 | 1998 | Active |
| Northwinds Air LLC | C20 | 2025 | Active |
| One Call Heating And Cooling | C20 | 2023 | Active |
| Orozco's Air Conditioning & Heating Inc | C20 | 2025 | Active |
| Osl Heating And Air | C20 | 2025 | Active |
| Pacific Air Heating & Cooling Inc | C20 | 2005 | Active |
| Pacific HVAC Mechanical | C20 | 2025 | Active |
| Pacific Mechanical HVAC Inc | C20 | 2018 | Active |
| Precision Heating & Cooling LLC | C20 | 2021 | Active |
| Prime Refrigeration Services | C38 | 2025 | Active |
| Prime Refrigeration Systems | C38 | 2009 | Active |
| Quality Heating & Air Conditioning Inc A | C20 | 2013 | Active |
| R A W Services Inc | C20 | 2011 | Active |
| Reliant Tradeworks Contracting Inc | C20 | 2022 | Active |
| Robert C L Plumbing Heating & Air Inc | C20 | 2007 | Active |
| Ross Air Conditioning Inc | C20 | 2010 | Active |
| Select A C R Inc | C20, C38 | 1976 | Renew by Oct 31, 2026 |
| Servlegacy Cooling And Heating | C20 | 2025 | Active |
| Sheldon's Heating & Air Inc | C20 | 2013 | Active |
| Sirius Mechanical Inc | C20 | 2004 | Active |
| Skyline Construction | C20 | 2015 | Active |
| Socal Republic Heating And Air Conditioning LLC | C20 | 2025 | Active |
| Solarcon Inc | C20, C38 | 2015 | Active |