R-22 PT Chart
A1 GWP 1810Pure refrigerant (Chlorodifluoromethane / Freon). HCFC.
⚠️ BANNED — Production/import prohibited since 2020 (US). Service-only with reclaimed.
About R-22
R-22 was the dominant residential AC refrigerant in the US until 2010. Production and import ended on January 1, 2020, so the only supply now is reclaimed or stockpiled gas, which is expensive. Techs still meet it in older equipment; common retrofit choices are R-407C and R-422D, both zeotropic blends that need liquid charging.
Saturation pressures at typical operating points, taken from the table below:
- Evaporator (AC, 40°F): 68.6 PSIG
- Condensing (110°F): 226.4 PSIG
The table covers -80°F to 200°F in 5°F steps. Below about -42°F the saturation pressure is below atmospheric, so gauges read in vacuum (shown in blue in the table).
R-22 Pressure-Temperature Graph
R-22 Saturation Pressure Table
Blue values indicate vacuum (below atmospheric pressure).
| °F | °C | PSIG | PSIA | kPa | bar |
|---|---|---|---|---|---|
| -80 | -62.2 | -9.9 | 4.78 | 33.0 | 0.33 |
| -75 | -59.4 | -9.1 | 5.61 | 38.7 | 0.387 |
| -70 | -56.7 | -8.1 | 6.56 | 45.2 | 0.452 |
| -65 | -53.9 | -7.1 | 7.63 | 52.6 | 0.526 |
| -60 | -51.1 | -5.9 | 8.84 | 60.9 | 0.609 |
| -55 | -48.3 | -4.5 | 10.19 | 70.3 | 0.703 |
| -50 | -45.6 | -3.0 | 11.7 | 80.7 | 0.807 |
| -45 | -42.8 | -1.3 | 13.39 | 92.3 | 0.923 |
| -40 | -40.0 | 0.6 | 15.26 | 105.2 | 1.052 |
| -35 | -37.2 | 2.6 | 17.34 | 119.5 | 1.195 |
| -30 | -34.4 | 4.9 | 19.62 | 135.3 | 1.353 |
| -25 | -31.7 | 7.4 | 22.14 | 152.7 | 1.527 |
| -20 | -28.9 | 10.2 | 24.91 | 171.7 | 1.717 |
| -15 | -26.1 | 13.2 | 27.93 | 192.6 | 1.926 |
| -10 | -23.3 | 16.5 | 31.23 | 215.3 | 2.153 |
| -5 | -20.6 | 20.1 | 34.82 | 240.1 | 2.401 |
| 0 | -17.8 | 24.0 | 38.73 | 267.0 | 2.67 |
| 5 | -15.0 | 28.3 | 42.96 | 296.2 | 2.962 |
| 10 | -12.2 | 32.8 | 47.54 | 327.7 | 3.277 |
| 15 | -9.4 | 37.8 | 52.48 | 361.8 | 3.618 |
| 20 | -6.7 | 43.1 | 57.79 | 398.5 | 3.985 |
| 25 | -3.9 | 48.8 | 63.51 | 437.9 | 4.379 |
| 30 | -1.1 | 55.0 | 69.65 | 480.2 | 4.802 |
| 35 | 1.7 | 61.5 | 76.22 | 525.6 | 5.256 |
| 40 | 4.4 | 68.6 | 83.26 | 574.0 | 5.74 |
| 45 | 7.2 | 76.1 | 90.76 | 625.8 | 6.258 |
| 50 | 10.0 | 84.1 | 98.76 | 680.9 | 6.809 |
| 55 | 12.8 | 92.6 | 107.28 | 739.7 | 7.397 |
| 60 | 15.6 | 101.6 | 116.33 | 802.1 | 8.021 |
| 65 | 18.3 | 111.2 | 125.94 | 868.4 | 8.684 |
| 70 | 21.1 | 121.4 | 136.13 | 938.6 | 9.386 |
| 75 | 23.9 | 132.2 | 146.92 | 1013.0 | 10.13 |
| 80 | 26.7 | 143.6 | 158.33 | 1091.6 | 10.916 |
| 85 | 29.4 | 155.7 | 170.38 | 1174.7 | 11.747 |
| 90 | 32.2 | 168.4 | 183.09 | 1262.4 | 12.624 |
| 95 | 35.0 | 181.8 | 196.5 | 1354.8 | 13.548 |
| 100 | 37.8 | 195.9 | 210.61 | 1452.1 | 14.521 |
| 105 | 40.6 | 210.8 | 225.46 | 1554.5 | 15.545 |
| 110 | 43.3 | 226.4 | 241.06 | 1662.1 | 16.621 |
| 115 | 46.1 | 242.8 | 257.45 | 1775.1 | 17.751 |
| 120 | 48.9 | 260.0 | 274.65 | 1893.7 | 18.937 |
| 125 | 51.7 | 278.0 | 292.69 | 2018.0 | 20.18 |
| 130 | 54.4 | 296.9 | 311.58 | 2148.3 | 21.483 |
| 135 | 57.2 | 316.7 | 331.37 | 2284.7 | 22.847 |
| 140 | 60.0 | 337.4 | 352.08 | 2427.5 | 24.275 |
| 145 | 62.8 | 359.0 | 373.74 | 2576.8 | 25.768 |
| 150 | 65.6 | 381.7 | 396.38 | 2732.9 | 27.329 |
| 155 | 68.3 | 405.3 | 420.04 | 2896.1 | 28.961 |
| 160 | 71.1 | 430.1 | 444.75 | 3066.4 | 30.664 |
| 165 | 73.9 | 455.9 | 470.56 | 3244.4 | 32.444 |
| 170 | 76.7 | 482.8 | 497.5 | 3430.1 | 34.301 |
| 175 | 79.4 | 510.9 | 525.62 | 3624.0 | 36.24 |
| 180 | 82.2 | 540.3 | 554.98 | 3826.4 | 38.264 |
| 185 | 85.0 | 570.9 | 585.63 | 4037.8 | 40.378 |
| 190 | 87.8 | 602.9 | 617.65 | 4258.5 | 42.585 |
| 195 | 90.6 | 636.4 | 651.12 | 4489.3 | 44.893 |
| 200 | 93.3 | 671.5 | 686.2 | 4731.2 | 47.312 |
Properties
| ASHRAE Designation | 22 |
| Safety Classification | A1 (non-flammable, low toxicity) |
| GWP (AR4, 100-yr) | 1810 |
| ODP | 0.055 |
| Molecular Weight | 86.47 g/mol |
| Boiling Point (1 atm) | -41.5°F / -40.8°C |
| Critical Temperature | 205.1°F / 96.1°C |
| Critical Pressure | 723.7 psia / 49.9 bar |
| Category | HCFC |
Common Applications
- Legacy AC systems
- Legacy refrigeration
Frequently Asked Questions
What pressure should R-22 be at 70°F?
At 70°F, R-22 has a saturation pressure of 121.4 PSIG (136.1 PSIA). Typical R-22 suction pressure at a 45°F evaporator is about 76.1 PSIG, and head pressure at a 105°F condenser is about 210.8 PSIG.
Can you still buy R-22 refrigerant?
R-22 production and import was banned in the US on January 1, 2020 under the EPA Clean Air Act. Only reclaimed or recycled R-22 is legally available. Prices are high due to limited supply. New equipment has not used R-22 since 2010.
What is the best drop-in replacement for R-22?
R-407C is the most common retrofit for R-22 split AC systems, with similar capacity and slightly higher pressures. R-422D is another option requiring no oil change. Neither is a true drop-in — system evaluation is recommended before conversion.
What refrigerant replaced R-22 in new equipment?
New equipment used R-410A from about 2010. Since January 2025, new US residential AC and heat pumps must use R-454B, R-32, or other EPA-approved low-GWP alternatives under the AIM Act.