A Heating Seasonal Performance Factor (HSPF) is the measure of efficiency of air source heat pumps that is the seasonal or annual efficiency of a heat pump operating in the heating mode.
Heating Seasonal Performance Factor (HSPF)
ThePD (The Project Definition)
ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.