Refrigerant PT charts
Saturation pressure at every temperature from −40 °F to 150 °F, as a gauge reads it at sea level. For other elevations, or to go from a gauge reading to a temperature, use the Refrigerant PT Calculator.
- R-410A PT chartR-410A is a near-azeotropic blend of R-32 and R-125 used in most U.S.
- R-32 PT chartR-32 (difluoromethane) is a single-component refrigerant, classed A2L (lower flammability), used in many newer ductless and ducted systems.
- R-22 PT chartR-22 is an HCFC that is no longer produced or imported in the U.S.
- R-134a PT chartR-134a is a single-component HFC used in chillers, refrigeration and vehicle air conditioning.
How these charts are made and checked
The tables are computed with CoolProp 8.0.0, an open-source library (MIT licence) that implements published equations of state, every 1 °F. They were generated on 2026-10-25. We did not copy any manufacturer’s chart. Instead, we compared our tables with independent published tables and only publish a refrigerant when it agrees with at least two of them: within 0.3 °F of a detailed property table, or within 0.6 °F of a whole-degree pocket card, expressed as saturation temperature.
| Refrigerant | Compared with | Points | Largest difference | Result |
|---|---|---|---|---|
| R-410A | Arkema, Forane 410A thermodynamic properties (generated with NIST REFPROP 9.0) | 382 | 0.023 °F (limit 0.3 °F) | Agrees |
| R-410A | Sporlan (Parker) Form 1 PT card | 190 | 0.501 °F (limit 0.6 °F) | Agrees |
| R-410A | Chemours, Freon 410A properties (older equation of state) | 212 | 0.603 °F (limit 0.3 °F) | Differs — not counted |
| R-410A | Bonneville Power Administration PT chart | 173 | 0.747 °F (limit 0.3 °F) | Differs — not counted |
| R-410A | Hudson Technologies PT chart | 39 | 1.466 °F (limit 0.3 °F) | Differs — not counted |
| R-32 | Sporlan (Parker) Form 1 PT card | 93 | 0.491 °F (limit 0.6 °F) | Agrees |
| R-32 | Hudson Technologies PT chart | 39 | 0.057 °F (limit 0.3 °F) | Agrees |
| R-22 | Sporlan (Parker) Form 1 PT card | 99 | 0.496 °F (limit 0.6 °F) | Agrees |
| R-22 | Hudson Technologies PT chart | 39 | 0.208 °F (limit 0.3 °F) | Agrees |
| R-134a | Chemours, Freon 134a properties | 106 | 0.068 °F (limit 0.3 °F) | Agrees |
| R-134a | Sporlan (Parker) Form 1 PT card | 92 | 0.502 °F (limit 0.6 °F) | Agrees |
For R-410A, the table that differs most was produced with an older equation of state, and two charts do not state how they were made. Our table agrees with a table generated with NIST REFPROP to 0.023 °F.
Why R-454B is not here yet
The open-source mixture model for R-454B differs from two independent published tables by about 1 °F. That is too much for charging work, so we do not publish an R-454B chart until a model or dataset agrees with independent sources. Use the manufacturer’s chart for R-454B equipment.
Using a PT chart
- A PT chart gives the saturation pressure: the pressure at which the refrigerant boils or condenses at that temperature.
- Superheat and subcooling compare a measured line temperature with that saturation temperature. The Superheat and Subcooling Calculator does it from your gauge readings.
- Charge equipment with the manufacturer’s procedure and target values. Only certified technicians may handle refrigerant.