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A ton of refrigeration is defined as the amount of heat removal required to change one ton of water (2000 pounds) at 32 degrees F to one ton of ice at 32 degrees F in one day which is 288000 BTUs. Today it is assumed that BTU ratings are by the hour, so one ton of refrigeration is the removal of 1200 BTU/hr. So if your air conditioning unit is removing 108000 BTUs/hr it is a

108000/12000 or 9 ton machine.

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Q: What is the tonnage of a 108000 btu ac?
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