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It should tell you in the user instructions or installation manual, or on a nameplate.

However, you can estimate the load by converting btu/hr into watts then dividing by the voltage you're using (e.g., 220, 110).

10,000 / 3.412.. is 2931 watts. At 220 volts it would draw 13.3 amps (or slightly more for inefficiencies in the compressor, fan, etc), while operating normally. Because this is more than 80 percent of the next-lower-rated breaker of 15A, you would install a 220-v breaker for a minimum of 16A (i.e., the next available size for your panel).

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Q: What size breaker do you use for a 18000 BTU Air Conditioner?
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