Power is energy per unit time, measured in watts (one joule per second). Horsepower comes in two common versions: mechanical horsepower is about 745.7 W, while metric horsepower (PS) is about 735.5 W, which is why European and US car figures differ slightly. Air conditioners are often rated in BTU per hour, where 1 W ≈ 3.412 BTU/h, and one ton of refrigeration is 12,000 BTU/h, about 3.517 kW. This converter helps compare engine outputs, size an AC for a room, or read an appliance label. A 1.5-ton AC delivers about 5.3 kW of cooling.
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