energy efficiency ratio
a measure of the efficiency of a heating or cooling system, as a heat pump or air conditioner, equal to the ratio of the output in B.T.U./hour to the input in watts: A high-efficiency home window air conditioner has an energy efficiency ratio of 7.5 or more. Abbreviation: EER
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020