HSPF

Heating Seasonal Performance Factor - Factor de Rendimiento Estacional de la Calefacción - medida de la eficiencia de una bomba de calor, el número HSPF indica el nivel de eficiencia, entre más alto sea, mayor es la eficiencia de la unidad

(Heating Seasonal Performance Factor) - A measure of heating efficiency for the total heating output of a central air-conditioning heat pump. Efficiency is derived according to federal test methods by using the total Btus during its normal usage period for heating divided by the total electrical energy input in watt-hours during the same period. California Code of Regulations, Section 2-1602(c)(7).