| Employer | City | |
| Aaero Heating & Sheet Metal | Novato | View Profile |
| ACCO Engineered Systems | Glendale | View Profile |
| Aerojet | Sacramento | View Profile |
| Affiliated Engineers, Inc. | Walnut Creek | View Profile |
| Air Plus Inc. | Van Nuys | View Profile |
| Air Systems, Inc. | San Jose | View Profile |
| Aire Rite | Huntington Beach | View Profile |
| All Temperatures Controlled | Chatsworth | View Profile |
| Alternative Energy Resources | Various Locations | View Profile |
| Artic Mechanical, Inc. | Rancho Cucamonga | View Profile |
| Atlas Heating & A/C | Oakland | View Profile |
| Atlas Mechanical | San Diego | View Profile |
| Atlas Sales & Rentals, Inc. | Newark | View Profile |
| Autodesk, Inc. | San Rafael | View Profile |
| Barr Engineering, Inc. | Santa Fe Springs | View Profile |
| Barstow Community College District | Barstow | View Profile |
| Bay Air Systems | Concord | View Profile |
| Bergelectric Corp. | Escondido | View Profile |
| Bogner's All Air Inc. | Scotts Valley | View Profile |
| Building Comfort Services | Riverside | View Profile |
| C & L Refrigeration Corp. | Brea | View Profile |
| Chism Commercial Inc. | Huntington Beach | View Profile |
| Christian Brothers Heating & Air Conditioning, Inc | Mira Loma | View Profile |
| City of Los Angeles | Los Angeles | View Profile |
| City of Torrance | Torrance | View Profile |
| Conditioned Air Mechanical Services | Various Locations | View Profile |
| Construct Corps | Various Locations | View Profile |
| Control Air Conditioning | Anaheim | View Profile |
| Cooper Oates Air Conditioning, Inc. | Sacramento | View Profile |
| County Air | Orange | View Profile |
| d'Autremont-Helms & Associates Arcadia | Arcadia | View Profile |
| Direct Energy - US Home Services | Various Locations | View Profile |
| Diversified Refrigeration Company | Valley Springs | View Profile |
| Dolan Foster Enterprises | Pleasenton | View Profile |
| DUCTMASTERS | Orange | View Profile |
| Emcor Group | Costa Mesa | View Profile |
| Energy Controls Company | Discovery Bay | View Profile |
| Engineering Economics Inc | Los Angeles | View Profile |
| EXCEL AIR CORPORATION | FALLBROOK | View Profile |
| Ferreira Service Inc. | Hayward | View Profile |
| First Service Networks | Various Locations | View Profile |
| Fundament & Associates | Irvine | View Profile |
| Gavilan Community College | Gilroy | View Profile |
| Gentec Electrical Services | Livermore | View Profile |
| George T Hall Co Inc | Anaheim | View Profile |
| GMH Communities | Various Locations | View Profile |
| Guttmann & Blaevoet Consulting Engineers | San Francisco | View Profile |
| Honeywell | Various Locations | View Profile |
| Ingersoll Rand Climate Control Technologies | Various Locations | View Profile |
| J & J Air Conditioning, Inc. | San Jose | View Profile |
| Jobelephant.com Inc. | San Diego | View Profile |
| Johnson Controls Inc, Controls Group | Various Locations | View Profile |
| Kirman Plumbing Company | Los Angeles | View Profile |
| Koehler Plumbing, Inc. | Santa Maria | View Profile |
| Leduc & Dexter, Inc | Santa Rosa | View Profile |
| Loma Linda University Medical Center | Loma Linda | View Profile |
| Loyola Marymount University | Los Angeles | View Profile |
| McQuay International/McQuay Service | Various Locations | View Profile |
| Mechanical Air Service, Inc. | San Jose | View Profile |
| MEP Jobs - Customer Fulfillment | Various Locations | View Profile |
| Mira Costa College | Oceanside | View Profile |
| Montage Laguna Beach | Laguna Beach | View Profile |
| NES Rentals Holdings, Inc | Various Locations | View Profile |
| NORESCO | Various Locations | View Profile |
| Norman Wright Mechanical | Brisbane | View Profile |
| Nowak Heating & Air Conditioning, Inc. | Castro Valley | View Profile |
| Ohlone College | Fremont | View Profile |
| Orchard Commercial | San Jose | View Profile |
| Pacific Coast Trane Service | Sunnyvale | View Profile |
| Pacific Rim Mechanical | San Diego | View Profile |
| Precise Air Systems, Inc. | Glendale | View Profile |
| R. J. Lanthier Co., Inc. | Escondido | View Profile |
| Ram Air Engineering | Lake Forest | View Profile |
| Rosendin Electric, Inc. | San Jose | View Profile |
| Sacramento Municipal Utility District | Sacramento | View Profile |
| San Jose/Evergreen Community College District | San Jose | View Profile |
| SASCO | Fullerton | View Profile |
| Service Logic | Various Locations | View Profile |
| Shasta Control Company | Palo Cedro | View Profile |
| Shawmut Design and Construction | Various Locations | View Profile |
| Sheet Metal Workers Local 162 | Sacramento | View Profile |
| Siemens Building Technologies | Various Locations | View Profile |
| Source Refrigeration & HVAC, Inc. | Anaheim | View Profile |
| Southern California Edison Co | Rosemead | View Profile |
| Southland Industries | Irvine | View Profile |
| Southwest Refrigeration, Inc. | Orange | View Profile |
| Starr State Air Inc. | Anaheim | View Profile |
| TechSmart Air Conditioning, Inc. | Morgan Hill | View Profile |
| The J. Paul Getty Trust | Los Angeles | View Profile |
| The Linc Group | Various Locations | View Profile |
| Trane Co | Sunnyvale | View Profile |
| Trane Commercial Systems | Various Locations | View Profile |
| Trane Commercial Systems - Sacramento | Rocklin | View Profile |
| Transwestern | Various Locations | View Profile |
| University of California Santa Cruz | Santa Cruz | View Profile |
| URS Corporation | Various Locations | View Profile |
| Val's Plumbing & Heating, Inc. | Salinas | View Profile |
| Visa International | San Francisco | View Profile |
| Weatherite Corporation | San Diego | View Profile |
| Wilson's Plumbing & Heating | Pacific Grove | View Profile |
| ZODIAC HVAC INC. | Van Nuys | View Profile |