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You need the EER rating, that will let you calculate the power used. EER is a measure of efficiency, power input versus power output.

The Energy Efficiency Ratio (EER) of a particular cooling device is the ratio of output cooling (in Btu/hr) to input electrical power (in Watts) at a given operating point (indoor and outdoor temperature and humidity conditions).

one ton HVAC capacity = 12,000 BTU/hour = 3500 watts

so if the EER is 10, then input power is 12000/10 = 1200 watts

Current used, if this is a 240 volt system, is 1200/240 = 5 amps

Another similar rating is COP (Coefficient of power) which is the output power in watts (instead of BTU/h) divided by input power, so with a COD = 3, for example, input power is 3500 /3 = 1200 watts.

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