| Employer | City | |
| Air Movers Inc. | Springfield | View Profile |
| Air Treatment Co | Vienna | View Profile |
| Alternative Energy Resources | Various Locations | View Profile |
| Anderson Mechanical Services, Inc. | Sterling | View Profile |
| Atlantic Constructors, Inc. | Richmond | View Profile |
| Centennial Contractors Enterprises, Inc | Vienna | View Profile |
| Clover Contracting, Inc. | Fairfax | View Profile |
| ColonialWebb Contractors | Richmond | View Profile |
| Construct Corps | Various Locations | View Profile |
| Damuth Trane | Chesapeake | View Profile |
| Dewberry-Fairfax | Fairfax | View Profile |
| Direct Energy - US Home Services | Various Locations | View Profile |
| Emcor Group | Various Locations | View Profile |
| Evans Heating And Air Llc | Ruther Glen | View Profile |
| First Service Networks | Various Locations | View Profile |
| Four Seasons Environmental, Inc. | Various Locations | View Profile |
| GMH Communities | Various Locations | View Profile |
| Honeywell | Various Locations | View Profile |
| Ingersoll Rand Climate Control Technologies | Various Locations | View Profile |
| J.E. Robert Companies | McLean | View Profile |
| Johnson Controls Inc, Controls Group | Various Locations | View Profile |
| KEMA Services, Inc. | Fairfax | View Profile |
| Linc Services, LLC | Sterling | View Profile |
| Lindab USA Inc. | Portsmouth | View Profile |
| M.E. Flow, Inc. | Leesburg | View Profile |
| McQuay International/McQuay Service | Staunton | View Profile |
| MEP Jobs - Customer Fulfillment | Various Locations | View Profile |
| Moore's Electrical & Mechanical Construction, Inc. | Alta Vista | View Profile |
| NES Rentals Holdings, Inc | Various Locations | View Profile |
| Newcomb Electric/IES | Roanoke | View Profile |
| NORESCO | Various Locations | View Profile |
| NOVEC | Manassas | View Profile |
| PAE Government Services, Inc. | Arlington | View Profile |
| Quarles Petroleum Inc-Corporate | Fredericksburg | View Profile |
| Service Logic | Various Locations | View Profile |
| Service Specialties Inc. | Chantilly | View Profile |
| Shawmut Design and Construction | Various Locations | View Profile |
| Shickel Corporation | Bridgewater | View Profile |
| Siemens Building Technologies | Various Locations | View Profile |
| The Linc Group | Various Locations | View Profile |
| Trane Commercial Systems | Various Locations | View Profile |
| Trane-Virginia District | Ashland | View Profile |
| Transwestern | Various Locations | View Profile |
| Trimark Corporation | Falls Church | View Profile |
| URS Corporation | Various Locations | View Profile |
| Warwick Plumbing & Heating Corporation | Newport News | View Profile |
| Washington Gas Energy Systems, Inc. | McLean | View Profile |