Tsl · Tssat · Tlsat
Mistake: Changing units and assuming the entered numbers were converted.
Fix: Numbers stay unchanged. Check the new unit and enter the intended measurement, or select an example for that system.
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HVAC superheat and subcooling worksheet
Calculate both temperature differences from four measured line and saturation temperatures.
This tool is archived. Recheck its method and dated data before use.
01Enter your values
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02HVAC superheat and subcooling worksheet
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How it works
Calculate both temperature differences from four measured line and saturation temperatures.
superheat = suction-line temperature − suction saturation temperature; subcooling = liquid saturation temperature − liquid-line temperature
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Discovery source
Your data stays yours
Inputs are processed on this page and are never sent to a server.
About this tool
Use tool ↑Calculate both temperature differences from four measured line and saturation temperatures.
Superheat is suction-line minus suction saturation; subcooling is liquid saturation minus liquid-line temperature. No refrigerant lookup or charge diagnosis is made.
- Enter your values
- °C / °F
- Tsl
- Tssat
- Tlsat
- Tll
- Calculation method
superheat = suction-line temperature − suction saturation temperature; subcooling = liquid saturation temperature − liquid-line temperature
- Example scenario · Result
SH: 7 K; SC: 7 K
Calculation method
- Superheat is suction-line minus suction saturation; subcooling is liquid saturation minus liquid-line temperature.
- No refrigerant lookup or charge diagnosis is made.
superheat = suction-line temperature − suction saturation temperature; subcooling = liquid saturation temperature − liquid-line temperature
HVAC superheat and subcooling worksheet
- °C / °F
- C
- Tsl
- 12 °
- Tssat
- 5 °
- Tlsat
- 42 °
- Tll
- 35 °
Result
SH: 7 K; SC: 7 K
Frequently asked questions
Does this determine the correct refrigerant charge?
No. It only computes measured differences; compare them with the equipment manufacturer’s procedure.
Where does my data go?
Calculations run on your device. Form inputs are not sent to a server.
Terms and definitions
Enter your values
- Measurement system
The initial choice follows your browser region. Your choice is remembered on this device. Gallons are US gallons. Switching units keeps your numbers unchanged and interprets them in the new unit.
Numbers stay unchanged. Check the new unit and enter the intended measurement, or select an example for that system.
- °C / °F
Choose the mode that matches the data you entered.
Options: C · F
- Tsl
Measured suction-line temperature
Enter an absolute temperature, not a temperature rise. Use the unit shown beside this field. °C / °F
Minimum: -200 · Maximum: 1000 °C
- Tssat
Suction saturation temperature from the correct pressure and refrigerant reference
Enter an absolute temperature, not a temperature rise. Use the unit shown beside this field. °C / °F
Minimum: -200 · Maximum: 1000 °C
- Tlsat
Liquid saturation temperature from the correct pressure and refrigerant reference
Enter an absolute temperature, not a temperature rise. Use the unit shown beside this field. °C / °F
Minimum: -200 · Maximum: 1000 °C
- Tll
Measured liquid-line temperature
Enter an absolute temperature, not a temperature rise. Use the unit shown beside this field. °C / °F
Minimum: -200 · Maximum: 1000 °C
Result
- Result
Superheat is suction-line minus suction saturation; subcooling is liquid saturation minus liquid-line temperature. No refrigerant lookup or charge diagnosis is made.
Calculated from your entries using the method below.
- SH
Superheat is suction-line minus suction saturation; subcooling is liquid saturation minus liquid-line temperature. No refrigerant lookup or charge diagnosis is made.
Calculated from your entries using the method below.
- SC
Superheat is suction-line minus suction saturation; subcooling is liquid saturation minus liquid-line temperature. No refrigerant lookup or charge diagnosis is made.
Calculated from your entries using the method below.
- Value
Superheat is suction-line minus suction saturation; subcooling is liquid saturation minus liquid-line temperature. No refrigerant lookup or charge diagnosis is made.
Calculated from your entries using the method below.
Common mistakes and quick fixes
Does this determine the correct refrigerant charge?
Mistake: Treating a result as valid outside the described scope.
Fix: No. It only computes measured differences; compare them with the equipment manufacturer’s procedure.
Limits and key assumptions
- No. It only computes measured differences; compare them with the equipment manufacturer’s procedure.
- No refrigerant lookup or charge diagnosis is made.
- Displayed results may be rounded; rounding does not add measurement precision.