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Assuming you are referring to air conditioning, and not a ton of coal or a ton of plutonium,
then 1 ton of air conditioning equivalent = 12 000 BTU.
Barkitecture - 2005 Doghouse Air-Conditioning 1-10 was released on:
USA: 30 November 2005
12,000 btuh = 1 ton cooling.
1 tonn used in air conditioning means 1 ton refrigerant used in air conditioning, so 1 ton refrigerant is same 12000 BTU