HSPF (Heating Seasonal Performance Factor)
more HVAC definitions
HSPF is an abbreviation for Heating Seasonal Performance Factor.
It is the most commonly used measure of the heating efficiency of heat pumps.
(The cooling efficiency of a heat pump is measured by its
SEER.)
Technically speaking, the HSPF is a heat pump's estimated seasonal heating output in
BTUs divided by the amount of energy that
it consumes in watt-hours.
The important takeaway from this definition is that the HSPF is a seasonal
measure (meaning that it takes into account the fact that the heat pumps rarely
for as long as is optimal during Spring and Fall). A heat pump with a high HSPF
is more efficient than a heat pump with a low HSPF.
New heat pumps manufactured after 2005 are required to have an HSPF of at least
7.7. The most efficient heat pumps have an HSPF of 10.
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