| Employer | City | |
| A & M Service | Des Plaines | View Profile |
| AA Service Co. Heating & Cooling | Northbrook | View Profile |
| Air Conditioning & Heating Company (The) | Carol Stream | View Profile |
| Airtech Heating and Cooling | Bellwood | View Profile |
| Allied A/C & Htg Corp | Palatine | View Profile |
| Alternative Energy Resources | Various Locations | View Profile |
| Amber Mechanical Contractors, Inc. | Alsip | View Profile |
| Amy Plumbing, Heating & Cooling, Inc. | Carpentersville | View Profile |
| Arnold & Son's Plumbing, Heating, A/C Inc. | Peoria | View Profile |
| Borter Heating & Air Conditioning Co., Inc. | Wheaton | View Profile |
| Climatemp Service Group LLC | Hillside | View Profile |
| Construct Corps | Various Locations | View Profile |
| Crowther Roofing & Sheet Metal | Lockport | View Profile |
| D.M. Dykstra & Company - A Nicor Services Company | Crestwood | View Profile |
| Direct Energy - US Home Services | Various Locations | View Profile |
| Dowling & Pope Advertising | Chicago | View Profile |
| Dubak Electrical | Lagrange | View Profile |
| Emcor Group | Various Locations | View Profile |
| Excelsior Mfg. & Supply Corp. | Itasca | View Profile |
| F E Moran, Inc. | NORTHBROOK | View Profile |
| Farnsworth Group Inc. | Peoria | View Profile |
| First Service Networks | Various Locations | View Profile |
| Fitzgerald Lighting and Maintenance | Aurora | View Profile |
| G & O Thermal Supply Co. | Chicago | View Profile |
| G F I Heating & Cooling | Batavia | View Profile |
| GMH Communities | Various Locations | View Profile |
| Hawthorn Heating - A Nicor Services Company | Wauconda | View Profile |
| Home Comfort Heating & Cooling, Inc. | Park Ridge | View Profile |
| Honeywell | Various Locations | View Profile |
| Houston Plumbing & Heating | Paxton | View Profile |
| Ingersoll Rand Climate Control Technologies | Various Locations | View Profile |
| Johnson Controls Inc, Controls Group | Various Locations | View Profile |
| Jones Lang LaSalle | Chicago | View Profile |
| Labor Finders | Various Locations | View Profile |
| Mahoney Plumbing Inc | Highwood | View Profile |
| Mangieri Plumbing & Heating | Galesburg | View Profile |
| McQuay International/McQuay Service | Various Locations | View Profile |
| MEP Jobs - Customer Fulfillment | Various Locations | View Profile |
| NES Rentals Holdings, Inc | Chicago | View Profile |
| Nicor Services | Wauconda | View Profile |
| NORESCO | Various Locations | View Profile |
| Precision Plumbing, Inc. | Lombard | View Profile |
| Refrigeration Enterprises Inc. | Villa Park | View Profile |
| Ridgeway Home Services | West Chicago | View Profile |
| Service Logic | Various Locations | View Profile |
| Shaker Advertising | Oak Park | View Profile |
| Shawmut Design and Construction | Various Locations | View Profile |
| Siemens Building Technologies | Various Locations | View Profile |
| Siemens Building Technologies, Inc. | Buffalo Grove | View Profile |
| Sterigenics | Willowbrook | View Profile |
| Straight Down Plumbing | Round Lake | View Profile |
| The Linc Group | Various Locations | View Profile |
| Thermaster Mechanical | Lombard | View Profile |
| Thermo Mechanical | Lombard | View Profile |
| Tradewinds Heating & Air Conditioning- A Nicor Services Company | Naperville | View Profile |
| Trane Commercial Systems | Various Locations | View Profile |
| Trane-Chicago | Willowbrook | View Profile |
| Transwestern | Chicago | View Profile |
| Unified Group (The) | Broadview | View Profile |
| URS Corporation | Various Locations | View Profile |
| X D X Innovative Refrigeration | Arlington Heights | View Profile |