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A rough rule: 20 BTU per square foot for standard rooms. Adjust upward for high ceilings, poor insulation, sunny exposures, and hot climates; adjust for kitchens (add 4,000 BTU) and heavily occupied spaces. Oversized units short-cycle and fail to dehumidify; undersized units run constantly. Energy Star sizing guidelines account for climate zone.
~3.517 kW
~1.000 tons cooling