Then, how do you calculate HVAC tonnage? Divide the number by 12 (which represents 12,000 Btu/hr, or one ton of cooling capacity) to get your AC unit’s tonnage. How to Find AC Tonnage 18 = 1.5 tons. 24 = 2 tons. 30 = 2.5 tons. 36 = 3 tons.
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