United States calculator
Calculate HVAC superheat and subcooling temperature differences
Calculate HVAC superheat and subcooling from measured line temperatures and refrigerant saturation temperatures using U.S. Fahrenheit defaults.
Suction line • saturation • liquid line
Calculator inputs
Superheat and Subcooling Calculator results
How this Superheat and Subcooling Calculator works
Superheat equals suction-line temperature minus evaporator saturation temperature. Subcooling equals condenser saturation temperature minus liquid-line temperature.
Important: Obtain saturation temperatures from the correct refrigerant pressure-temperature data and equipment instructions. Charging targets vary by system, metering device and conditions.
What assumptions should I verify?
Verify every entered quantity, rate, unit, product specification and local requirement before relying on the estimate. U.S. conventions are primary where location matters.
Is information sent anywhere?
No. Calculations run locally in the browser and this calculator sends no entered information to a remote service.