AFUE (annual fuel utilization efficiency) is the measurement of how efficiently a gas furnace or boiler will operate over an entire heating season. AFUE is measured as a percentage; the higher the better!
COP (coefficient of performance) is the measurement of how efficiently a heating or cooling will operate at a single outdoor temperature condition. A COP in the high single digits is fantastic.
HSPF (heating seasonal performance factor) is the measurement of how efficiently heat pumps will operate in their heating mode over an entire heating season. A HSPF between 7 – 8 is typical for a good rating for an energy-efficient heat pump.
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