| best hot air heating systems | 1.32 | 0.7 | 1694 | 28 | 23 |
| best heating and air systems | 0.66 | 0.3 | 4208 | 28 | 82 |
| best home heating and air systems | 0.15 | 0.7 | 1781 | 33 | 11 |
| best heat and air systems | 0.37 | 0.2 | 202 | 25 | 9 |
| best heating air conditioning systems | 1.56 | 0.1 | 7970 | 37 | 75 |
| hot air heating systems | 1.19 | 0.3 | 2053 | 23 | 24 |
| best rated heating air conditioning systems | 1.48 | 0.7 | 2731 | 43 | 82 |
| best home heating systems | 1.3 | 0.5 | 7123 | 25 | 29 |
| the best heating system | 1.67 | 1 | 172 | 23 | 73 |
| best heating system hvac | 0.18 | 0.4 | 892 | 24 | 27 |
| best heat air conditioning system | 0.2 | 0.7 | 838 | 33 | 27 |
| best kind of heating system | 1.54 | 0.8 | 2054 | 27 | 71 |
| best type of heating system | 0.56 | 0.2 | 105 | 27 | 13 |
