What is meant by a ‘ton’ of refrigeration?

Why can’t you ad coolant to my system without checking for a leak or repairing an exiting leak?
Confusingly, the unit has little to do with weight, as used in everyday language. One ton of refrigeration is the term used to refer to 12,000 B.T.U.s/hour (British Thermal Units/Hour) of cooling effect. Thus, a condensing unit with a cooling capacity of 60,000 B.T.U.s/hour is said to have a capacity of 5 tons.

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