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Square footage
BTU per Square Foot for Air Conditioning: The Chart and the Math
How many BTU per square foot you need for cooling, with a room-size chart, the climate adjustments that change the number, and why 20 BTU/sq ft is only a starting point.
AC Tonnage by Room Size: Sizing Chart and How to Calculate It
How to size AC tonnage by room or house square footage. A square-footage-to-tonnage chart, the 20 BTU per sq ft rule, climate adjustments, and why room-by-room sizing beats rules of thumb.