Refrigerant PT Chart, Printable: R-22, R-410A, R-32
Last checked October 20, 2026
Saturation pressure at each temperature, for six common refrigerants. Print it, or keep it on your phone.
What a PT chart tells you
At saturation, a refrigerant's pressure and temperature move together. If you know one, the chart gives you the other.
On the job, that lets you:
- Turn suction pressure into an evaporator saturation temperature, then work out superheat
- Turn head pressure into a condensing temperature, then work out subcooling
- Check whether a standing system's pressure matches the refrigerant on the nameplate (a mismatch can mean air or the wrong refrigerant)
EPA's test topics expect you to read a PT chart, and to know that you add 14.7 to a gauge reading (psig) to get absolute pressure (psia) (EPA test topics).
Bubble and dew points
Some blends boil across a temperature range, called glide. For those, the chart lists two pressures:
- Bubble point (liquid). Use it for subcooling.
- Dew point (vapor). Use it for superheat.
R-407C has a large glide. R-404A has a small one. R-410A's glide is under about 1 psi, so it gets one column.
The chart
Pressures are psig at sea level. Values marked "in. Hg vac" are below atmospheric pressure.
| °F | R-22 | R-134a | R-410A | R-32 | R-404A bubble | R-404A dew | R-407C bubble | R-407C dew |
|---|---|---|---|---|---|---|---|---|
| -20 | 10.2 | 3.7 in. Hg vac | 26.3 | 26.8 | 16.8 | 16.0 | 13.7 | 6.5 |
| 0 | 24.0 | 6.5 | 48.3 | 49.3 | 33.7 | 32.6 | 29.5 | 19.4 |
| 20 | 43.1 | 18.4 | 78.5 | 80.0 | 56.6 | 55.3 | 51.2 | 37.9 |
| 30 | 55.0 | 26.1 | 97.2 | 99.1 | 70.7 | 69.3 | 64.7 | 49.6 |
| 35 | 61.5 | 30.4 | 107.5 | 109.7 | 78.6 | 77.1 | 72.2 | 56.1 |
| 40 | 68.6 | 35.0 | 118.6 | 121.0 | 86.9 | 85.4 | 80.2 | 63.2 |
| 45 | 76.1 | 40.1 | 130.4 | 133.0 | 95.8 | 94.2 | 88.8 | 70.7 |
| 50 | 84.1 | 45.4 | 142.9 | 145.8 | 105.3 | 103.6 | 97.9 | 78.8 |
| 60 | 101.6 | 57.4 | 170.4 | 174.0 | 126.0 | 124.2 | 117.9 | 96.8 |
| 70 | 121.4 | 71.1 | 201.4 | 205.8 | 149.3 | 147.4 | 140.5 | 117.3 |
| 80 | 143.6 | 86.7 | 236.1 | 241.5 | 175.4 | 173.4 | 165.8 | 140.5 |
| 90 | 168.4 | 104.3 | 274.9 | 281.3 | 204.5 | 202.4 | 194.1 | 166.7 |
| 100 | 195.9 | 124.2 | 318.0 | 325.7 | 236.8 | 234.7 | 225.5 | 196.1 |
| 110 | 226.4 | 146.4 | 365.9 | 374.9 | 272.6 | 270.4 | 260.2 | 229.0 |
| 120 | 260.0 | 171.2 | 418.9 | 429.3 | 312.1 | 309.9 | 298.6 | 265.8 |
The printable version runs from -40 °F to 150 °F in 5 °F steps.
Printable PDF coming soon. It's getting a check by a certified technician first. Leave your email and we'll send it when it's ready.
How these numbers were made
We didn't copy another company's chart. Values were computed with CoolProp 8.0.0, an open-source property library that uses published reference equations of state for each refrigerant (Bell et al., Industrial & Engineering Chemistry Research, 2014). Sea-level atmosphere is taken as 14.696 psia.
Values are rounded to 0.1 psi. Your gauges, altitude and the refrigerant's actual condition all affect what you read in the field. Always follow the equipment manufacturer's charging data.
Not on the chart yet
R-454B isn't included yet. We'll add it once we can compute it from a published reference model and check it against a manufacturer's chart.
Sources
- CoolProp 8.0.0 (computed 2026-10-20): https://coolprop.org/ (checked 2026-10-20)
- Bell, I. H., Wronski, J., Quoilin, S., Lemort, V. (2014). Pure and pseudo-pure fluid thermophysical property evaluation and the open-source thermophysical property library CoolProp. Ind. Eng. Chem. Res. 53(6), 2498-2508.
- EPA, Section 608 Test Topics (psig to psia; PT charts): https://www.epa.gov/section608/section-608-technician-certification-test-topics (checked 2026-10-20)