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The Least Efficient Room Air Conditioners

Ranked by listed annual energy use, highest first. Every model here is still ENERGY STAR certified; they are simply the hungriest certified room air conditioners, often because they are the largest.

Window air conditioner

The 10 highest of 443 certified.

Models with annual energy use and estimated running cost
Cost a year in the U.S.
WhirlpoolWHAW-241IN24000$2561417.3
TCLT24WQ2S24000$2561417.3
TCLH24W4KW-CA24000$2561417.3
TCLH24W4KW24000$2561417.3
K�hlKHVL28B35BMost Efficient28300$2701494.7
K�hlKCVL28B30BMost Efficient28900$2831570.7
FriedrichKCVL28B30AMost Efficient28900$2961642
FriedrichKHVL28B35A28200$3031678.6
K�hlKCVL36B30BMost Efficient33000$3331847
FriedrichKCVL36B30A34100$3782096.3

10 models · cost a year at the U.S. average residential rate of 18.0¢ per kWh

Through-the-wall air conditioner

The 10 highest of 53 certified.

Models with annual energy use and estimated running cost
Cost a year in the U.S.
SeasonsST14VA2Most Efficient14000$136755.4
PELONISPAT14R2KWTMost Efficient14000$136755.4
MideaMWEUTW-14CRFN8-MCM9Most Efficient14000$136755.4
MideaMAT14R2SWTKMost Efficient14000$136755.4
MideaMAT14R2FWTKMost Efficient14000$136755.4
FrigidaireFHTC145WC2Most Efficient14000$136755.4
FriedrichWCVT12B10A13500$138767
WallmasterWHVT14B33BMost Efficient14300$151837.9
FriedrichWHVT14B33A15200$171950
FriedrichWCVT16B30A16800$1801000

10 models · cost a year at the U.S. average residential rate of 18.0¢ per kWh

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