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In page Air conditioning:
"The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment.[5] A similar standard is the European seasonal energy efficiency ratio (ESEER).[citation needed]
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