| Employer | State | City | |
| W.E. Welch & Associates, Inc. | Maryland | Ijamsville | View Profile |
| Waldrop Heating & Air Conditioning | South Carolina | SPARTANBURG
Spartanburg | View Profile |
| Washington Gas Energy Systems, Inc. | Virginia | McLean | View Profile |
| Watson Pharmaceutical | California | Corona | View Profile |
| Weatherite Corporation | California | San Diego | View Profile |
| Weathertrol | Florida | Miami | View Profile |
| Werley Heating and Air Conditioning Co | Pennsylvania | Allentown | View Profile |
| West Electric Group, Inc. | Colorado | Colorado Springs | View Profile |
| West Jersey Air Conditioning & Heating | New Jersey | Pennsauken | View Profile |
| Westbrook Service Corporation | Florida | Orlando | View Profile |
| Widewaters Heating & Air Conditioning | New York | East Syracuse | View Profile |
| Wilson's Plumbing & Heating | California | Pacific Grove | View Profile |
| WK Mechanical Inc. dba DYNE-AIR MECHANCIAL & SHEETMETAL | New York | Monroe | View Profile |