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## Main Question or Discussion Point

In my room there's a small aircon, it is 12000BTU. I know there are some bigger ones which can be 18000 or 24000 BTU.

BTU is a unit to measure heat value, which is similar to calorie or joule. So why do they use a heat value unit to show the power of an aircon, but not a power unit such as kW or horsepower.

Thanks for reading.

BTU is a unit to measure heat value, which is similar to calorie or joule. So why do they use a heat value unit to show the power of an aircon, but not a power unit such as kW or horsepower.

Thanks for reading.