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Subcooling Calculator
Subcooling for TXV charge verification.
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HVAC calculators
Sizing, airflow, efficiency, and heating and cooling costs, each with visible math.
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Superheat Calculator
Superheat from gauge pressure-temperature and line temp.
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Return Air Size Calculator
Return grille and duct size that will not starve the blower.
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Rectangular Duct Equivalent Calculator
Huebscher round equivalent for rectangular duct.
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CFM per Ton Calculator
Blower airflow across the 350-450 range.
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Air Changes (ACH) Calculator
ACH plus the ASHRAE 62.2 ventilation target.
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Baseboard Heater Size Calculator
Watts and linear feet for electric baseboard.
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Evaporative Cooler Size Calculator
Swamp-cooler CFM for dry climates.
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Boiler Size Calculator
Boiler gross output with piping and pickup allowance.
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Portable AC Size Calculator
Portable BTU plus real SACC cooling output.
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