HSPF stands for Heating Seasonal Performance Factor. It's a rating that measures the heating efficiency of heat pumps. The higher the HSPF rating, the more efficient the heat pump is at heating a space during the heating season. It is commonly used to compare the heating efficiency of different heat pump models and is a key factor in determining the long-term cost-effectiveness of a heat pump system. AHRI is the Air-Conditioning, Heating, and Refrigeration Institute, and it is the source of the HSPF ratings.
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