HSPF
Heating Seasonal Performance Factor. This is a measure of how efficiently a heat pump provides heating over an entire heating season. It is calculated by dividing the total heating output (measured in BTUs) by the total electricity consumed (measured in watt-hours) during the same period. A higher HSPF rating indicates a more efficient heat pump. This rating is commonly used to compare the energy efficiency of different heat pump models. For context, an HSPF of 8 or above is generally considered good efficiency for modern heat pumps.
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