What is the difference between AFUE and HSPF ratings?

What is the difference between AFUE and HSPF ratings?

• A. AFUE measures heating efficiency of furnaces/boilers; HSPF measures heating efficiency of heat pumps over a season
• B. AFUE measures cooling efficiency of air conditioners
• C. HSPF measures electrical efficiency of heating elements
• D. AFUE and HSPF measure the same thing

Answer: (A)

AFUE and HSPF are both efficiency ratings, but they apply to different equipment and measure performance over a heating season. AFUE, shown as a percentage, tells you how effectively a furnace or boiler converts fuel into usable heat during a typical heating season. HSPF is measured in Btu per watt-hour and shows how efficiently a heat pump produces heat over the heating season, accounting for electricity use. Because AFUE applies to combustion-based heating equipment and HSPF applies to heat pumps, they aren’t interchangeable. The statement that matches this is that AFUE measures heating efficiency of furnaces/boilers and HSPF measures heating efficiency of heat pumps over a season.

AFUE and HSPF are both efficiency ratings, but they apply to different equipment and measure performance over a heating season. AFUE, shown as a percentage, tells you how effectively a furnace or boiler converts fuel into usable heat during a typical heating season. HSPF is measured in Btu per watt-hour and shows how efficiently a heat pump produces heat over the heating season, accounting for electricity use. Because AFUE applies to combustion-based heating equipment and HSPF applies to heat pumps, they aren’t interchangeable. The statement that matches this is that AFUE measures heating efficiency of furnaces/boilers and HSPF measures heating efficiency of heat pumps over a season.