How it works
A rough rule of thumb is 20–30 BTU per square foot depending on climate. One ton of cooling equals 12,000 BTU.
BTU Calculator
Estimate heating and cooling capacity for a room based on square footage.
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Frequently asked questions
How many BTU per square foot?
A common estimate is about 20 BTU per square foot in mild climates and up to 30 in hot climates.