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AC Size Calculator
Estimate central AC size in BTU/hr and tons from floor area and climate.
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Sizing calculators
Focused screening tools for sizing.
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Baseboard Heater Size Calculator
Watts and linear feet for electric baseboard.
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Boiler Size Calculator
Boiler gross output with piping and pickup allowance.
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Cooling BTU by Room Size
Room AC BTU from length, width, and ceiling height.
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Dehumidifier Size Calculator
Dehumidifier pints per day for your space.
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Evaporative Cooler Size Calculator
Swamp-cooler CFM for dry climates.
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Furnace Size (BTU) Calculator
Furnace output and input BTU from home size, climate, and AFUE.
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Garage Heater Size Calculator
Garage heater BTU from volume and temperature rise.
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Heat Pump Size Calculator
Heat pump size in BTU/hr and tons from home heat load.
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Home Heat Load Estimator
Manual J style design heat load from area and loss rate.
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Mini-Split Size Calculator
Ductless mini-split total and per-zone BTU from area and zone count.
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Portable AC Size Calculator
Portable BTU plus real SACC cooling output.
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