How Many Watts of Electricity does a Modern Window-mounted Air Conditioner use?

Real power-use measurements from a modern window-mounted air conditioner.

How Much Power does a Modern Window-mounted Air Conditioner use

Modern Window-mounted Air Conditioner: 550 Watts


  • An air-conditioner works like a refrigerator, compressing air or fluid into a small space and then letting that air or fluid expand into another space. Compressing the fluid makes it give off heat, which happens outside of the window. Letting the fluid expand causes it to draw in heat, which happens inside the room. They run in cycles, triggered by a thermostat, or continuously.
  • varies depending on the temp and fan settings, but the fan motor probably isn't using nearly the same amount of electricity as the basic air conditioning. 550 watts.

Power Use

  • Watts: 550
  • Kilowatts: 0.55 Kw.

Operation Cost

  • cost per minute: 11 hundredths of one cent (0.11 ¢)
  • cost per hour: 6.6¢
  • cost per day: 53¢
  • cost per month: $10.04

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Power use of these items was actually tested. Individual items will vary, but these are the actual measurements.