H.S.P.F. = Heating Seasonal Performance Factor.
The heating seasonal performance factor (HSPF) is a measure of heat pump heating performance. Like the SEER rating, it is similar to the miles per gallon (MPG) of your automobile: the higher, the better. The HSPF rating number is derived by taking an average of performance at many different outdoor temperatures. Because HSPF is the best way to judge how efficient a heat pump is, it is important to review this rating with your sales representative as you consider specifications on your new system.
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