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energy efficiency ratio

noun
1.
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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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