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What does the HSPF of a heat pump system mean?
Friday, August 3, 2018
HSPF stands for Heating Season Performance Factor. It is the ratio of BTU heat output over a heating season to the watt-hours of electricity used, and is the standard measure of energy efficiency for heat pump in heating mode..
Just like the SEER rating used to evaluate cooling efficiency, a higher number means better efficiency, the minimum HSPF required by the U.S. Department of Energy starting on January 1, 2023, is 8.8 for any new heat pump system, and is 8.2 until then. Older systems have an HSPF of about 7.7, and the current high efficiency models are rated at 9 or higher.
The separate Annual Furnace Utilization Efficiency (AFUE) rating is used for gas and electric resistance heat furnaces. To read about that standard, see our blog post Is the energy efficiency of the furnace part of the SEER rating of a central air conditioning system?
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To learn more about heating and air conditioning systems, see these other blog posts:
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