Contractor Tools

Field calculators for HVAC contractors: load, duct size, superheat and subcooling, refrigerant pressure-temperature, and margin and markup. Pick a tool to get started.

System design

HVAC Load Calculator

Whole-house heating and cooling load from the ZIP code, size and construction, with a cooling size in tons.

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Duct Size Calculator

Round and rectangular duct sizes from airflow and friction rate, with surface area and sheet metal weight by gauge.

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Service

Superheat and Subcooling

Superheat, subcooling and approach from gauge and line temperature readings, for R-410A, R-454B and R-32.

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Refrigerant PT Chart

Saturation temperature for any pressure, or pressure for any temperature, for R-410A, R-454B and R-32, corrected for elevation.

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Business

Margin and Markup

Price a job from its cost and your target margin or markup, or check the margin on a price you’ve already quoted.

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