Heating and cooling calculators
BTU sizing, air conditioning and furnace capacity. Every calculator on this page returns a purchase ready quantity with the waste allowance shown and the working visible.
BTU Calculator
Estimate the BTU capacity a room needs for cooling or heating, adjusted for sun exposure, occupancy, kitchens and climate zone.
Open calculator →AC Sizing Calculator
Estimate the air conditioner tonnage and furnace capacity a home needs by square footage and climate zone, with a plain warning.
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