HVAC Superheat Calculator

R-410A liquid line 95F at 340 psi - subcool low or charge right? Superheat and subcool from built-in PT charts for R-410A, R-22, R-134a, R-404A. $4.99 one-time, no login.

On a service call and need to check superheat and subcooling without flipping through PT charts? Select your refrigerant (R-410A, R-22, R-134a, R-404A, R-32, or R-454B), enter suction and liquid line pressures and temperatures, and get instant color-coded readings: green for normal, yellow for marginal, red for out of range.

WHAT IT CALCULATES:

• Superheat (suction line temperature minus saturation temperature)
• Subcooling (saturation temperature minus liquid line temperature)
• Saturation temperatures from built-in pressure-temperature data

REFRIGERANTS SUPPORTED:

• R-410A
• R-22
• R-134a
• R-404A
• R-32
• R-454B

KEY FEATURES:

• Built-in saturation pressure-temperature data for all six refrigerants
• Color-coded status indicators for quick diagnosis
• Target range reference (10-15 F for both superheat and subcooling)
• Instant results as you adjust inputs
• Works completely offline
• No account or login required

Built for HVAC technicians, refrigeration mechanics, and service professionals who need fast, reliable superheat and subcooling checks during system diagnostics and charging.