How is heat pump Heating Seasonal Performance Factor, HSPF, calculated?
A) HSPF is a measure of heating BTU per watt averaged for the entire heating season.
B) HSPF is a measure of heating BTU per watt measured at one particular condition.
C) HSPF is the ratio of heat output divided by heat input measured at one particular condition.
D) HSPF is the ratio of heat output divided by heat input averaged for the entire heating season.
A
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