How Many Watts Does a Window Air Conditioner Use?

Answer
900 W typical (500–1,500 W)

A window air conditioner uses about 900 watts while running. At a typical 8 hours a day that is 216.0 kWh per month, or about $36.72 at $0.17/kWh. A 10,000 BTU unit draws about 900 W; the compressor cycles, so real use depends on the weather.

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    For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer

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    Window Air Conditioner power use at a glance

    Value
    Typical running watts900 W
    Range500–1,500 W
    Current at 120 V7.5 A
    Typical use8 h per day
    Energy per day7.20 kWh
    Energy per month216.0 kWh
    Cost per month ($0.17/kWh)$36.72
    Cost per year$447

    Check the label on your appliance for its exact rating. The calculator above uses your own watts, hours and electricity rate.

    Frequently asked questions

    Can I run a window air conditioner on a generator?

    Yes. Choose a generator whose running watts exceed 900 W and whose starting watts cover the motor surge.

    How many amps does a window air conditioner draw?

    About 7.5 A at 120 V.

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