Heating Seasonal Performance Factor (HSPF)
The Heating Seasonal Performance Factor (HSPF) is a measurement used to rate the efficiency of heat pumps in heating mode over an entire heating season. It is calculated by dividing the total heating output (in British Thermal Units or BTUs) by the total electricity consumed (in watt-hours) during the same period. A higher HSPF number indicates a more energy-efficient heat pump, meaning it can provide more heat while using less electricity.
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