HVAC Calculator
Calculate
Formula
BTU = Sq Ft × 20 × Climate Multiplier × Ceiling Multiplier. Tons = BTU ÷ 12,000.
Frequently Asked Questions
How many BTU per square foot?
A general rule is 20 BTU per square foot for standard 8-foot ceilings in a moderate climate.
What is a ton of cooling?
One ton of cooling equals 12,000 BTU per hour. Most residential systems range from 1.5 to 5 tons.
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