Heat pumps, geothermal and AC
Heat Pump Efficiency explained - The definitive guide to SEER vs HSPF vs (S) COP Heat Pump Ratings
...HSPF rating for a new heat pump is 7.7. However, many high-efficiency heat pumps have HSPF ratings that are much higher, typically in the range of 8.5 to 10. Some models can even have HSPF ratings above 12.
It's worth noting that the HSPF rating is just one factor to consider when choosing a heat pump. Other factors, s...