| heat pump → HasA → a balance point | 0.45 | |
| heat pump → HasA → reversing valve | 0.44 | |
| heat pump → HasA → a titanium heat exchanger | 0.41 | |
| heat pump → HasA → a 24 hour timer | 0.38 | |
| heat pump → HasA → hspf ratings | 0.38 | |
| heat pump → HasA → valve | 0.35 | |
| heat pump → HasA → component | 0.34 | |
| heat pump → HasA → a cop of 3 | 0.33 | |
| heat pump → HasA → a coefficient of performance | 0.25 | |
| heat pump → HasA → higher seer | 0.25 | |
| heat pump → HasA → two stages of heat | 0.25 | |
| heat pump → HasA → reputation | 0.19 | |
| heat pump → HasA → the highest efficiency | 0.16 |