Answer / Virendra Yadav

The rating of an AC unit (indoor or outdoor) is determined by its total power output, measured in watts. The efficiency of the unit is often expressed as the seasonal energy efficiency ratio (SEER) for air conditioners or the heating seasonal performance factor (HSPF) for heat pumps.nnTo calculate the required capacity (in BTUs per hour) for an AC unit, you can use the formula:nnBTU/hr = (Room area in sq. ft. x Room height in ft.) x 250

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