R-22 Pressure-Temperature Chart
Saturation pressure in psig by temperature for R-22, from -40°F to 140°F — kept for servicing the large installed base of legacy equipment. R-22 is a single-component HCFC with no glide, running well below R-410A pressures. Values are cross-checked against manufacturer and independent P-T charts.
R-22 saturation pressure
| Temp (°F) | Pressure (psig) |
|---|---|
| -40°F | 0.6 |
| -30°F | 4.9 |
| -20°F | 10.2 |
| -10°F | 16.5 |
| 0°F | 24 |
| 10°F | 32.8 |
| 20°F | 43.1 |
| 30°F | 55 |
| 40°F | 68.6 |
| 45°F | 76.1 |
| 50°F | 84.1 |
| 55°F | 92.6 |
| 60°F | 101.6 |
| 70°F | 121.4 |
| 80°F | 143.6 |
| 90°F | 168.4 |
| 100°F | 195.9 |
| 110°F | 226.4 |
| 120°F | 260 |
| 130°F | 296.9 |
| 140°F | 337.4 |
A service-only refrigerant
R-22 is no longer sold as new refrigerant, but it is far from gone — millions of installed systems still run on it, and servicing them means reading this chart to check charge and diagnose faults. The values run much lower than the R-410A that replaced it: 40°F is 69 psig here versus 118 for R-410A. When a system is beyond economical repair, replacement moves to the current A2L refrigerants rather than a like-for-like R-22 swap.
Use the chart the standard way — pressure to saturation temperature, then compare against the line temperature for superheat or subcooling per the superheat & subcooling chart. R-22's low-temperature end sits near its atmospheric boiling point, so the bottom rows read close to zero gauge.
Common questions
What is the normal pressure for R-22?
R-22 tracks its P-T chart: about 69 psig at a 40°F low-side saturation temperature and around 196–260 psig on the high side at 100–120°F. Those are much lower than R-410A at the same temperatures, which is the quickest way to tell the two apart on the gauges.
Can you still buy R-22?
Not as new product. R-22 (HCFC-22) was phased out under the Montreal Protocol and Clean Air Act; since January 1, 2020 there has been no new US production or import. It survives only as reclaimed/recycled refrigerant for servicing existing equipment, which is why its price has climbed.
Why does R-22 read near zero at -40°F?
Because -40°F is close to R-22’s atmospheric boiling point (about -41°F). Just above that temperature the saturation pressure is barely positive on the gauge — 0.6 psig at -40°F — and a bit colder it crosses into a slight vacuum. It is single-component with no glide, so one clean pressure column applies.
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