How Many Watts Does a Central Air Conditioner Use?

Answer
3,500 W typical (2,000–5,000 W)

A central air conditioner uses about 3,500 watts while running. At a typical 8 hours a day that is 840.0 kWh per month, or about $142.80 at $0.17/kWh. A 3-ton (36,000 BTU) central unit draws about 3–3.5 kW while the compressor runs.

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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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    Central Air Conditioner power use at a glance

    Value
    Typical running watts3,500 W
    Range2,000–5,000 W
    Current at 120 V29.2 A
    Typical use8 h per day
    Energy per day28.00 kWh
    Energy per month840.0 kWh
    Cost per month ($0.17/kWh)$142.80
    Cost per year$1,738

    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 central air conditioner on a generator?

    Yes. Choose a generator whose running watts exceed 3,500 W and whose starting watts cover the motor surge.

    How many amps does a central air conditioner draw?

    About 29.2 A at 120 V, or 14.6 A on 240 V.

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