| 1st Due Solutions LLC | HVA | 2018 | Active |
| A Massenburg Inc | HVA | 1997 | Active |
| A S Dalton Company Inc | HVA | 2006 | Active |
| A-Mass Inc | HVA | 2017 | Active |
| Abm Building Services LLC | HVA | 2020 | Active |
| Acors & Griffith Heating & Air Conditioning Inc | HVA | 1991 | Active |
| Air Energy Solutions LLC | HVA | 2018 | Active |
| Air-Pro Mechanical LLC | HVA | 2005 | Active |
| Alfreds Home Improvements General Contractors LC | HVA | 2001 | Active |
| American Heating & Cooling Inc | HVA | 2005 | Renew by Oct 31, 2026 |
| American Refrigeration Services LLC | HVA, REF | 2007 | Active |
| Amerigas Propane LP | HVA | 2003 | Active |
| Anderson Air Conditioning And Heating Corporation | HVA | 2012 | Active |
| At Cost Air LLC | HVA | 2026 | Active |
| Atlantic Constructors LLC | HVA | 2003 | Active |
| Atlantic Piping Inc | HVA | 2018 | Active |
| Atlantis Heating & Cooling LLC | HVA | 2005 | Active |
| Bailey S Plumbing Heating & Cooling Inc | HVA | 2005 | Active |
| Belle Isle Heating And Air Conditioning Co LLC | HVA | 2023 | Active |
| Berachah Mechanical & Refrigeration Inc | HVA, REF | 2009 | Active |
| Build Atop LLC | HVA | 2025 | Active |
| Cabinetry & Construction Inc | HVA | 2002 | Active |
| Capitol Oil Co Inc | HVA | 1995 | Active |
| CBT HVAC Inc | HVA | 2003 | Active |
| Chargois Company Incorporated | HVA | 2011 | Active |
| Climate Solutions LLC | HVA | 2017 | Active |
| Colonial Refrigeration & Air Conditioning Company Inc | HVA | 1992 | Active |
| Creative Home Concepts LLC | HVA | 1999 | Active |
| Cypress Heating & Air Conditioning LLC | HVA | 2021 | Active |
| D & D Mechanical Inc | HVA | 2004 | Renew by Oct 31, 2026 |
| D L Jones Plumbing Inc | HVA | 2000 | Active |
| D M Jeffers Company Incorporated | HVA | 1996 | Active |
| Daniel & Company Inc | HVA | 1996 | Active |
| Design Air LLC | HVA | 2004 | Active |
| Discount Contractors LLC | REF | 2009 | Active |
| Dna Heating And Cooling LLC | HVA | 2023 | Active |
| Doak Contracting Inc | HVA | 2006 | Active |
| Dutton Food Equipment Repair Inc | HVA | 2007 | Active |
| Eev Mechanical Inc | HVA | 2025 | Active |
| Em&S Combustion Inc | HVA | 2024 | Active |
| Emc Mechanical Services LLC | HVA | 2014 | Renew by Nov 30, 2026 |
| Erjore LLC | HVA | 2008 | Active |
| Excelsior Air LLC | HVA | 2010 | Active |
| Gammino Realty And Development LLC | HVA | 2005 | Active |
| GCTG Construction Inc | HVA | 2022 | Active |
| Gibson Industrial Inc | HVA | 2000 | Active |
| Goode Heating And Cooling Corporation | HVA | 2021 | Active |
| H & M Sales And Services Inc | REF | 2010 | Active |
| Hertless Air Conditioning & Heating Mechanical Corporation | HVA | 2005 | Active |
| Howardaire Services LLC | HVA | 2012 | Active |
| Hungerford Oil Company Incorporated | HVA | 2001 | Active |
| HVAC By JM LLC | HVA | 2009 | Active |
| Island Cabinets LLC | HVA | 2014 | Active |
| Island Refrigeration & Mechanical Inc | HVA | 2000 | Active |
| J & F HVAC Heating And Cooling LLC | HVA | 2026 | Active |
| JMK Investments LLC | REF | 2004 | Active |
| K T Evans Mechanical Contracting LLC | HVA | 2015 | Active |
| K&B Heating And Air LLC | HVA | 2026 | Active |
| L F Desouza Heating And Cooling Inc | HVA | 2007 | Active |
| L.F. Desouza Heating And Cooling Inc | HVA | 2005 | Active |
| Lorieco Va LLC | HVA | 2026 | Active |
| LTD Heating & Air LLC | HVA | 2022 | Active |
| M & E Contractors Inc | HVA | 2005 | Active |
| M A Herrell Company LLC | HVA, REF | 2010 | Active |
| M A Williams Inc | HVA | 2012 | Active |
| Mastech Mechanical | HVA | 2022 | Active |
| McAc Mechanical Services LLC | HVA | 2026 | Active |
| Mechanical Solutions LLC | HVA | 2011 | Active |
| Metro Aire LLC | HVA | 2019 | Active |
| Miller Mechanical Inc | HVA, REF | 2011 | Active |
| Mountain Minisplits LLC | HVA | 2026 | Active |
| NCG & J Corp | REF | 2003 | Active |
| Nuckols Plumbing & Gas LLC | HVA | 2016 | Active |
| Oliver S Plumbing & Heating LLC | HVA | 2010 | Active |
| Plumbline Construction Company LLC | HVA | 2010 | Active |
| Ralphs Plumbing & Heating Inc | HVA | 1992 | Active |
| Repair Air LLC | HVA | 2025 | Active |
| Richmond Heating & Air Inc | HVA | 2007 | Active |
| River City Heating & Air Inc | HVA | 2007 | Active |
| RMGP Inc | HVA | 2018 | Active |
| Scott S Affordable Construction LLC | REF | 2005 | Active |
| Second Chance HVAC Repairs LLC | HVA | 2025 | Active |
| See Mechanical LLC | HVA | 2021 | Active |
| Service Experts Heating & Air Conditioning LLC | HVA | 2020 | Active |
| Shelton S Comfort-Zone LLC | HVA | 2023 | Active |
| Siemens Industry Inc | HVA | 1999 | Active |
| Smooth Heating & Cooling LLC | HVA | 2026 | Active |
| Tap Water LLC | HVA | 2023 | Active |
| Taylor Construction Services Inc | HVA | 1999 | Active |
| Te-Co Mechanical Services Inc | HVA | 1995 | Active |
| Techmasters LLC | HVA | 2020 | Active |
| Tessera Integrity LLC | HVA | 2025 | Active |
| The Carpentry And Painting Experts LLC | HVA | 2005 | Active |
| The Energy Control Co LLC | HVA | 2013 | Active |
| The Hyperion Group Inc | HVA | 2009 | Active |
| Thermal Precision LLC | HVA, REF | 2011 | Active |
| TKS Mechanical LLC | HVA | 2015 | Active |
| Verlander Heating & Air LLC | HVA | 2026 | Active |
| Virginia Ice Company LLC | HVA | 2025 | Active |
| W & W Contractors Inc | HVA | 1992 | Active |