Refrigerant PT Chart
Saturation pressure or temperature for 19 refrigerants. Pick one and type a number.
How to use ↓Type a temperature to see the saturation pressure.
Browse refrigerants
How to use
- Pick the refrigerant.
- Choose Temperature or Pressure and type the number. The answer shows straight away.
- Blends show two values: use vapor (dew) for superheat and liquid (bubble) for subcooling.
- Tap °C · kPa for metric. Below 0 psig, pressure is in inches of mercury (inHg) vacuum.
Pressure temperature charts for the trade
Each refrigerant has its own PT chart page with the full table for every degree, a °F/°C switch and a one-page pocket chart to print. Blends such as R-454B, R-407C and R-448A show both the liquid (bubble) and vapor (dew) pressure.
The tables are checked against current manufacturer and supplier charts (Chemours, Honeywell, Arkema, A-Gas) and NIST. Reference only: always verify with the manufacturer’s data and your gauges.
FAQ
What is a PT chart?
A pressure temperature chart lists the saturation pressure of a refrigerant at each temperature. Techs use it to turn gauge pressure into saturation temperature for superheat and subcooling.
Should I use the liquid or the vapor column?
Use vapor (dew) for superheat and liquid (bubble) for subcooling. Single-component refrigerants such as R-22 and R-32 have one column.
Why do some pressures show inHg?
Below 0 psig the chart shows vacuum in inches of mercury, the way a compound gauge reads.