How big an AC does the law require?
Short answer§ 27-2030
At least 20 BTU per hour for each square foot of the room, for window and wall units.
- The mathMultiply the room's length by its width in feet, then by 20. A 12 by 10 foot room needs at least 2,400 BTU per hour.
- In practiceMost window units start at 5,000 BTU, so small bedrooms usually need the smallest size sold.
- Central systemsCentral systems must instead meet the Building Code and be approved by the Department of Buildings.
- ENERGY STAR adviceAdd 10% for a sunny room and 4,000 BTU for a kitchen.
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