BTU Calculator
About BTU Calculator
BTU (British Thermal Unit) measures the cooling capacity of air conditioners. The general rule is 20 BTU per cubic foot of space, adjusted for insulation, sun exposure, and climate. A properly sized unit runs efficiently and dehumidifies well.
An undersized unit runs continuously without cooling properly; an oversized unit short-cycles and fails to remove humidity. This calculator gives a range — for rooms with additional heat sources (kitchens, server rooms) add 4,000-6,000 BTU.