How Many Amps Does a 12,000 BTU Air Conditioner Use?

Answer
9.1 A at 120 V · 1,091 W

Running watts ≈ BTU ÷ EER. With a typical EER of 11, a 12,000 BTU unit uses about 1,091 W, which is 9.1 A at 120 V. Starting current is 2–3× higher for a moment on units without an inverter compressor.

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1.0 for heaters and lights; 0.8–0.9 for motors.
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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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    12,000 BTU air conditioner electrical data

    Value
    Cooling capacity12,000 BTU/h (1.00 ton)
    Running power (EER 11)1,091 W
    Amps at 120 V9.1 A
    Amps at 240 V4.5 A
    Typical circuit15 A, 120 V
    Energy per 8 h8.7 kWh

    Check the nameplate: it lists the rated amps (RLA) and the maximum breaker (MOCP). Inverter mini-splits use less at partial load.

    Frequently asked questions

    Can a 12,000 BTU air conditioner run on a 15 amp circuit?

    Yes.

    What size generator for a 12,000 BTU air conditioner?

    At least 3,000 starting watts, or less with a soft starter or inverter unit.

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