| Employer | State | City | |
| Ballard A/C & Heating, LLC | Arizona | Scottsdale | View Profile |
| Barcol-Air Ltd | Connecticut | Oxford | View Profile |
| Bardi Mechanical | Georgia | Norcross | View Profile |
| Bardi Mechanical Annonymous | Georgia | Norcross | View Profile |
| Bay Air Systems | California | Concord | View Profile |
| Benjamin Franklin Plumbing | Kansas | Wichita | View Profile |
| Berger Engineering Company | Texas | Dallas | View Profile |
| Bernard Hodes Group | New York | New York | View Profile |
| Bishop Air Service | Nevada | Henderson | View Profile |
| Blattner Energy, Inc. | Minnesota | Avon | View Profile |
| Blauch Brothers, Inc. | Virginia | Harrisonburg | View Profile |
| Blue Northern Air Conditioning | Texas | Channelview | View Profile |
| BMC AGGREGATES | Iowa | Elkrun Heights | View Profile |
| Borter Heating & Air Conditioning Co., Inc. | Illinois | Wheaton | View Profile |
| Boston Symphony Orchestra | Massachusetts | Boston | View Profile |
| Boulden's One Hour Heating & Air Conditioning | Delaware | Newark | View Profile |
| Boulden's One Hour Heating & Air Conditioning | Delaware | Newark | View Profile |
| Brandywine Realty Trust | Pennsylvania | Radnor | View Profile |
| Brighton Installation | New York | Freeport | View Profile |
| Burch Corporation | Alabama | Birmingham | View Profile |