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SpecWindmill 12,000 BTU WhisperTech Window AC (12W2Wi)Midea U 12,000 BTU (MAW12U1KWT)
PhotoWindmill 12,000 BTU WhisperTech Window AC (12W2Wi)Midea U 12,000 BTU (MAW12U1KWT)
Our scoreSCORE5.7 / 10SCORE7.5 / 10
Our takeThe largest WhisperTech, but its CEER of 13.5 trails the 8,000 and 10,000 and it isn't ENERGY STAR listed. At this size an LG Dual Inverter at CEER 15 is the better buy.The 2026 12,000 BTU U at CEER 16, ENERGY STAR Most Efficient and not recalled. Little owner history yet.
TypeWindowU-shaped window
Cooling (DOE / SACC)12,000 BTU12,000 BTU
CEER13.516best
InverterYesYes
Heat modeNoneNone
Noise, lowest setting (maker figure)42 dBAn/a
Window width, min23 inn/a
Window width, max37 inn/a
Min sash opening14 inn/a
Weight65 lbn/a
Warranty1 yrn/a
ENERGY STARNoYes
Watch out forWindmill's warranty is one year on every size, with no longer compressor term, and owners report control-board and stop-cooling failures. Windmill sells a non-inverter Original and a budget Lite line under the same name; confirm the model number on the box.U1KWT and the recalled U1QWT differ by one letter (K vs Q).
MoreModel detailsOur full reviewView on Amazon →Model detailsOur full review