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A ton is the cooling capacity of an air conditioning system. The capacity of an air conditioner refers to the amount of heat it can remove. One ton is equal to the amount of heat required to melt one ton of ice in a 24-hour period. A ton, as used in the HVAC field, is a term that describes how much heat the AC unit can remove from a home in one hour. A one-ton air conditioner is rated at 12,000 Btu per hour.

How many square feet will a 1 ton AC cool?

Often 1 ton of air conditioning capacity required for each 600 square feet of conditioned floor area, usually abbreviated 600 sf/ton.