| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | Advance Heating & Air Conditioning Corp. | heating installation | 16 |
| 2 | A.G. Baird Limited | heating installation | 1 |
| 3 | Air-Devices Canada Ltd. | heating installation | 1 |
| 4 | AL-KO Therm GmbH | heating installation | 0 |
| 5 | Almar Plumbing & Heating Corporation | heating installation | 5 |
| 6 | Alta Services | heating installation | 1 |
| 7 | Baltur S.p.A. | heating installation | 0 |
| 8 | Bellwood Sheet Metal Limited | heating installation | 1 |
| 9 | Belmar Ventilation Systems Inc. | heating installation | 1 |
| 10 | Brady & Seidner Associates Ltd. | heating installation | 8 |
| 11 | Brand & Partner | heating installation | 1 |
| 12 | Buderus AG | heating installation | 0 |
| 13 | CGC Group Hybrid Heat Pump Systems | heating installation | 1 |
| 14 | Commercial Plumbing & Heating Co. | heating installation | 1 |
| 15 | Connelly Mechanical, Inc. | heating installation | 0 |
| 16 | Conway Heating & Cooling | heating installation | 1 |
| 17 | Cooltech Air Systems Ltd. | heating installation | 6 |
| 18 | Cyvsa Calefacción y Ventilación S.A. de C.V. | heating installation | 18 |
| 19 | Danfoss, OOO | heating installation | 1 |
| 20 | Dewey Engineering Company | heating installation | 1 |