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Duct Size Calculator
Round duct diameter from CFM and design velocity.
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HVAC calculators
Sizing, airflow, efficiency, and heating and cooling costs, each with visible math.
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CFM Airflow Calculator
Required CFM from BTU load and temperature split.
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Home Heat Load Estimator
Manual J style design heat load from area and loss rate.
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Heating Cost Comparison
Annual heating cost: heat pump vs gas furnace head to head.
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SEER Savings Calculator
Yearly dollar savings from upgrading to a higher SEER rating.
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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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Heat Pump Size Calculator
Heat pump size in BTU/hr and tons from home heat load.
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Furnace Size (BTU) Calculator
Furnace output and input BTU from home size, climate, and AFUE.
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Cooling BTU by Room Size
Room AC BTU from length, width, and ceiling height.
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BTU to Tons Converter
Convert BTU/hr to tons and kW for any HVAC equipment rating.
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