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R-22 Pressure Temperature Chart
Interactive PT chart for R-22 (Freon 22). Enter a temperature to find saturation pressure, or enter a pressure to find saturation temperature. R-22 production is banned — pre-loaded for fast field lookups on legacy systems.
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R-22 Saturation Data
41 data points| Temperature | Pressure (psig) |
|---|---|
| -40°F | 0.5 |
| -35°F | 2.4 |
| -30°F | 4.5 |
| -25°F | 6.8 |
| -20°F | 9.4 |
| -15°F | 12.2 |
| -10°F | 15.4 |
| -5°F | 18.8 |
| 0°F | 22.6 |
| 5°F | 26.7 |
| 10°F | 31.2 |
| 15°F | 36 |
| 20°F | 41.3 |
| 25°F | 47 |
| 30°F | 53.2 |
| 35°F | 59.8 |
| 40°F | 66.9 |
| 45°F | 74.6 |
| 50°F | 82.8 |
| 55°F | 91.7 |
| 60°F | 101.1 |
| 65°F | 111.2 |
| 70°F | 121.9 |
| 75°F | 133.4 |
| 80°F | 145.5 |
| 85°F | 158.4 |
| 90°F | 172.1 |
| 95°F | 186.6 |
| 100°F | 201.9 |
| 105°F | 218.1 |
| 110°F | 235.2 |
| 115°F | 253.3 |
| 120°F | 272.3 |
| 125°F | 292.4 |
| 130°F | 313.5 |
| 135°F | 335.8 |
| 140°F | 359.2 |
| 145°F | 383.8 |
| 150°F | 409.8 |
| 155°F | 437.1 |
| 160°F | 465.8 |
Source: ASHRAE Fundamentals. Pressures are gauge (psig) at sea level. Negative values indicate vacuum conditions.
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R-22 Pressure Reference Values
R-22 (also known as Freon 22, HCFC-22, and Genetron 22) was the dominant residential air conditioning refrigerant from the 1960s through the 2000s. Production in the United States ended on January 1, 2020. Millions of legacy R-22 systems remain in service.
| Temperature | R-22 (psig) |
|---|---|
| 0°F / -18°C | 30 |
| 20°F / -7°C | 46 |
| 40°F / 4°C | 67 |
| 50°F / 10°C | 83 |
| 70°F / 21°C | 115 |
| 100°F / 38°C | 181 |
| 110°F / 43°C | 217 |
| 130°F / 54°C | 292 |
Approximate values. Use the interactive tool above for precise readings. Source: ASHRAE Fundamentals.
Key Facts About R-22
R-22 production and import in the United States was banned on January 1, 2020 under the Clean Air Act. Only reclaimed and recycled R-22 may be used to service existing equipment.
R-22 has an Ozone Depletion Potential (ODP) of 0.055 and a Global Warming Potential (GWP) of 1,810. Its ozone-depleting properties were the primary reason for the Montreal Protocol phase-out.
At 40°F, R-22 saturates at approximately 67 psig — compared to R-410A at 115 psig and R-134a at 51 psig at the same temperature.
R-22 uses mineral oil or alkylbenzene (AB) oil as the compressor lubricant. This is incompatible with R-410A, which requires POE (polyolester) oil. Flushing or replacing the compressor is required when converting to any HFC refrigerant.
The EPA's SNAP program has approved several R-22 retrofit refrigerants including R-407C, R-422D, and MO99 for use in existing R-22 equipment. Each requires verifying oil compatibility and metering device adjustments.
R-22 PT Chart — Frequently Asked Questions
What are the normal operating pressures for R-22?
At typical HVAC operating conditions, R-22 saturates at approximately 67 psig at 40°F (evaporator) and 217 psig at 110°F (condenser). Suction pressure on a residential R-22 system at ARI conditions is normally 68–72 psig. Discharge pressure typically runs 225–265 psig depending on outdoor temperature. These values are noticeably lower than R-410A systems, which is why R-22 components are not interchangeable with R-410A components.
Why is R-22 so expensive now?
R-22 production in the United States was banned on January 1, 2020 under the Clean Air Act and the Montreal Protocol phase-out schedule. No new R-22 can be manufactured domestically. The only legal supply is reclaimed refrigerant from decommissioned systems. As R-22 equipment ages and leaks accelerate, demand for reclaimed R-22 has pushed prices to $30–80 per pound or more in some markets — compared to under $5 per pound before the phase-out.
Can I replace R-22 with R-410A?
No. R-22 and R-410A are not interchangeable. R-410A operates at pressures roughly 60–70% higher than R-22, and it requires different compressor oil (POE rather than mineral oil), different metering devices, and different component ratings. Attempting to charge an R-22 system with R-410A will damage or destroy the equipment and is illegal. If you want to move a legacy R-22 system to a lower-cost refrigerant, approved drop-in substitutes like R-407C or R-422D are options, though they all require verified system compatibility.
Is it legal to service an R-22 system?
Yes — existing R-22 systems can still be serviced legally using reclaimed R-22. It is illegal to vent R-22 intentionally, and it requires EPA Section 608 certification to purchase and handle R-22. The ban only covers production of new R-22; technicians can buy, sell, and use reclaimed R-22 to service existing equipment. However, due to cost, many building owners choose to replace R-22 systems rather than repair significant leaks.
What is the superheat target for an R-22 system?
For a residential R-22 fixed-orifice system at ARI rating conditions (95°F outdoor, 80°F/67°F WB indoor), target suction superheat is typically 10–20°F measured at the suction line near the air handler. TXV-equipped R-22 systems target 8–12°F superheat at the evaporator outlet. To calculate: look up your suction pressure in this PT chart to get the saturation temperature, then subtract that from your measured suction line temperature.
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Researched by the RefrigerantTrack Research Team