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Seasonal energy efficiency ratio - Wikipedia
The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER)
The SEER rating of a unit is the cooling output during a typical cooling-season divided by the total electric energy input during the same period. The higher the unit's SEER rating the more energy efficient it is. In the U.S., the SEER is the ratio of cooling in British thermal unit (BTU) to the energy consumed in watt-hours.
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SEER (Seasonal Energy Efficiency Rating) Defined