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

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

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

Old Window-mounted Air Conditioner: 929 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 inside the fridge, or continously.

Power Use

  • Watts: 929
  • Kilowatts: 0.929 Kw.

Operation Cost

  • cost per minute: 19 hundredths of one cent (0.19 ¢)
  • cost per hour: 11.1¢
  • cost per day: 89¢
  • cost per month: $16.95

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