| 3j S Air Conditioning And Heating LLC | HVA | 2013 | Active |
| 7 Services Inc | HVA + HIC | 2007 | Active |
| A J Lyons Construction Inc | HVA + RBC, CBC, PLB +2 | 2003 | Active |
| A Sea Inc | HVA | 2026 | Active |
| A Step In Time Inc | HVA + CBC, RBC, PLB +1 | 2011 | Active |
| A-1 American Services Inc | HVA + PLB, GFC | 2000 | Active |
| A/C Central Heating And Air Conditioning LLC | HVA + RBC, CBC, NGF | 2008 | Active |
| Aable Plumbing Services Of Virginia Inc | HVA + PLB, GFC | 1996 | Active |
| Abr Mechanical Services LLC | HVA + GFC | 2019 | Active |
| Absolute Comfort Heating & Cooling Inc | HVA | 2004 | Active |
| Acclimated Air LLC | HVA | 2023 | Active |
| Accurate Air Conditioning And Heating Inc. | HVA + GFC | 1999 | Active |
| Ace Mechanical Inc. | HVA + CIC, HIC, GFC | 2008 | Active |
| Acosta Builders LLC | HVA + PLB, HIC | 2024 | Active |
| Adam Myers Plumbing Inc | HVA + PLB, GFC | 2006 | Active |
| Adrian Builders Group LLC | HVA + RBC, CBC, GFC | 2014 | Active |
| Advanced Modular Services Incorporated | HVA + CBC, RBC, PLB +2 | 2000 | Active |
| Advantage Heating And Cooling Inc | HVA + NGF, LPG, GFC | 2003 | Active |
| Air Care Experts Inc | HVA + GFC | 2014 | Active |
| Air Cooled Solutions LLC | HVA | 2024 | Active |
| Airtrade Inc | HVA | 2026 | Active |
| Alnam Corp | HVA + AES, CBC, RBC +5 | 1991 | Active |
| American Comfort Group LLC | HVA | 2026 | Active |
| Applied Mechanical Rersources Inc | HVA, REF + NGF, RBC, CBC +5 | 2002 | Active |
| Ba & Ja Services LLC | HVA + RBC, CBC, ELE | 2014 | Active |
| Baja 757 LLC | HVA | 2024 | Active |
| Bay Mechanical LLC | HVA + PLB, CBC | 2026 | Active |
| Bayside Electric Inc | HVA + ELE | 2007 | Active |
| Bayside Heating And Air Conditioning Co Inc | HVA + GFC | 1994 | Active |
| Bda Builders LLC | HVA + PLB, GFC, ELE +1 | 2021 | Active |
| Bertolino Brothers Inc | HVA + GFC, PLB, RBC +2 | 1992 | Active |
| Best Value Heating And Cooling LLC | HVA + GFC | 2019 | Active |
| Betty S Plumbing & Heating Inc | HVA + PLB, GFC | 2013 | Active |
| Beyond Comfort HVAC LLC | HVA | 2025 | Active |
| Big Dog Plumbing & Heating LLC | HVA + LPG, RBC, CBC +3 | 2009 | Active |
| Blair S Plumbing LLC | HVA + PLB, GFC | 2007 | Active |
| Blue Crab Mechanical LLC | HVA | 2020 | Active |
| Built With Integrity Inc | HVA + PLB, RBC, CBC +2 | 2017 | Active |
| Butt Plumbing And Heating Incorporated | HVA + NGF, PLB | 1991 | Active |
| CCG LLC | HVA + ELE, RBC, GFC | 2025 | Active |
| Charles E Warren Inc | HVA + PLB | 2019 | Active |
| Chim Chimney LLC | HVA + GFC, HIC | 2016 | Active |
| Chris Mechanical Services Inc | HVA + PLB, ELE, GFC | 2011 | Active |
| Chuck S Mechanical Appliance Service Inc | HVA + GFC | 2003 | Active |
| Classic Air Care LLC | HVA + ELE, GFC | 2010 | Active |
| Coastal Virginia Piping Systems | HVA + PLB | 2025 | Active |
| Comfort Home Services LLC | HVA | 2025 | Active |
| Comfort Plus Control LLC | HVA + ELE | 2013 | Active |
| Comfortron LLC | HVA, REF + RBC, CBC, H/H | 2012 | Active |
| Commercial Refrigeration Services Inc | HVA + GFC, ELE | 2018 | Active |
| Conner Services Inc | HVA + PLB, GFC | 1999 | Active |
| Contractor Services LLC | HVA + RBC, CBC | 2005 | Active |
| Cool Guys Heat & Air LLC | HVA | 2021 | Active |
| Crest Foodservice Equipment Co Inc | HVA + GFC, EMC | 2007 | Active |
| Cyclone Mechanical Inc | HVA + GFC | 2005 | Active |
| CZ Mechanical | HVA + GFC | 2026 | Active |
| Dacu Mechanical LLC | HVA + GFC | 2017 | Active |
| Dailey & Sons Heating And Cooling LLC | HVA + GFC | 2021 | Active |
| Dan & Son Mechanical LLC | HVA + GFC | 2008 | Active |
| Davcon Inc | HVA + PLB, GFC | 1993 | Active |
| Davken Mechanical Inc | HVA + PLB, GFC | 2001 | Active |
| Divergent Construction Management Group Inc | HVA + GFC, CBC, PLB +2 | 2023 | Active |
| DL Mobile Services LLC | HVA + ELE | 2024 | Active |
| DMJ Heating And Cooling LLC | HVA | 2019 | Active |
| Dr Degrees HVAC LLC | HVA + GFC | 2016 | Active |
| Ductman HVAC Services Inc | HVA + GFC | 2022 | Active |
| Edge Mechanical Inc | HVA + PLB, GFC | 2003 | Active |
| Eln Enterprises LLC | HVA + RBC, CBC, PLB +3 | 2008 | Active |
| Essential Trade Services Inc | HVA | 2023 | Active |
| Expert Air Inc | HVA | 2018 | Active |
| Fair Mechanical LLC | HVA | 2014 | Active |
| Freedom Mechanical Inc | HVA | 2002 | Active |
| G & H Mechanical Inc | HVA | 2011 | Active |
| Galactic Air Incorporated | HVA + GFC | 2015 | Active |
| Gas Specialty Company Inc | HVA + GFC | 2001 | Active |
| Get It Right Hvac/R LLC | HVA | 2022 | Active |
| Goodman Developers Inc | REF + POL, RBC, CBC +1 | 2012 | Active |
| Green Run Inc | HVA + CBC, GFC | 2017 | Active |
| Guaranteed Plumbing LLC | HVA + PLB, GFC | 2012 | Active |
| Gulf Stream Mechanical Inc | HVA + PTC, CIC | 2011 | Active |
| Haney S All Trade Services LLC | HVA + PLB, GFC | 2018 | Active |
| Hare S Heating Cooling And Electrical Inc | HVA + ELE, HIC | 2011 | Active |
| Hats Off Heating & Cooling Inc. | HVA + GFC | 2017 | Active |
| Home Modernization Center Inc | HVA + CBC, RBC, PLB +2 | 1997 | Active |
| Hoyle Appliance & Refrigeration SVC LLC | REF + RBC, CBC, CIC +1 | 2012 | Renew by Nov 30, 2026 |
| HTC LLC | HVA + GFC | 2021 | Active |
| Hutchinson Mechanical Energy Specialists Inc | HVA + GFC | 2004 | Active |
| HVAC & R Solution LLC | HVA, REF | 2014 | Active |
| HVAC Pro LLC | HVA | 2021 | Active |
| Ingair LLC | HVA, REF | 2013 | Active |
| Inlet Plumbing & Drain Inc | HVA + PLB, GFC | 2006 | Active |
| Jim Bertolino Plumbing And Drain Service Inc | HVA + PLB, ELE, GFC | 1998 | Active |
| JJR Enterprises LLC | HVA | 2024 | Active |
| Joint Resources Solutions LLC | HVA + GFC | 2016 | Active |
| Joyner S Heating & Cooling Inc. | HVA + GFC | 2013 | Active |
| JT Mechanical Company | HVA + PLB, GFC | 2015 | Active |
| Jwoods LLC | HVA | 2025 | Active |
| Kaac Inc | HVA + ELE | 2018 | Active |
| Kearney S Heating & Air LLC | HVA | 2026 | Active |
| Key Mechanical LLC | HVA + CBC, RBC, ELE +2 | 2010 | Active |