| 01 | Costco | 60.5 |
| 02 | Local independent contractor with ACCA/ENERGY STAR quality credentials | 41.0 |
| 03 | Costco HVAC installation | 31.5 |
| 04 | Home Depot | 31.5 |
| 05 | North American Technician Excellence (NATE) certification | 30.0 |
| 06 | Costco HVAC Partner Program | 29.0 |
| 07 | Home Depot HVAC installation | 27.8 |
| 08 | Rational choice and utility/profit maximization | 27.8 |
| 09 | Utility- or ENERGY STAR-participating contractor | 25.6 |
| 10 | Home Depot & Lowe’s Installation Services | 22.3 |
| 11 | NATE-certified independent local dealers | 22.3 |
| 12 | Local Factory-Authorized Independent Dealers | 19.6 |