Divide the HVAC load for the entire building by 12,000 to figure out the required equipment size. The amount of electricity needed to run a 2-ton HVAC unit is 12,000 BTUs, so a house or office needs 24,000 BTUs. A number that is uneven, such as 2, is not a good sign. With a load capacity of 28,000 BTU, the unit costs $33.
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