What does the acronym HSPF stand for?

The acronym HSPF stands for Heating Seasonal Performance Factor. This metric is essential in evaluating the efficiency of air-source heat pumps, particularly for heating purposes. It represents the total heating output (in British thermal units or BTUs) that a heat pump provides over a typical heating season divided by the total electrical energy (in watt-hours) consumed during that same period. A higher HSPF indicates a more efficient heat pump, allowing users to gauge the effectiveness of the system in converting electrical energy into heating during the colder months. Understanding HSPF is crucial for consumers when selecting a heat pump, as it directly influences energy bills and overall home comfort.