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Best apps like HVAC Calculator: BTU & AC Load
10+ similar apps compared and reviewed
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10 free apps
Updated September 2026
HVAC Calculator is great, but it's not the only option. Explore 10+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.
Top Alternatives to HVAC Calculator
HVAC Load & Refrigerant Calc by Shanghai Sheyuan Network Technology Co., Ltd.
Refrigerant, Manual J & BTUStrong Contender
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DuctSizer Pro
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HVAC Pro Calculator: NEC + P-T
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This app provides essential tools for HVAC technicians and electricians, including BTU load sizing, duct calculations, and refrigerant pressure-temperature charts. It offers a free tier with core functions and an optional Pro upgrade for advanced features like voltage drop calculations and unlimited job saving.
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Flux HVAC: Tech Calculator
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This professional toolkit helps HVAC technicians diagnose issues, charge systems accurately, and validate work with essential calculators. It offers offline functionality for superheat, subcooling, duct sizing, system performance, psychrometrics, and capacitor testing.
Superheat and Subcooling CalculatorsDuct Sizing with VisualizerSystem Performance (BTU/Ton) Calculation
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HVAC Load Calc: Manual J
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