R-32 Pressure-Temperature Chart
Saturation pressure in psig by temperature for R-32, from -40°F to 140°F. R-32 is a single-component A2L refrigerant used in mini-splits and new equipment, running a few psi above R-410A. One pressure column applies — R-32 has no temperature glide. Values are cross-checked against manufacturer P-T charts.
R-32 saturation pressure
| Temp (°F) | Pressure (psig) |
|---|---|
| -40°F | 11 |
| -30°F | 18.2 |
| -20°F | 26.8 |
| -10°F | 37.1 |
| 0°F | 49.2 |
| 10°F | 63.5 |
| 20°F | 80 |
| 30°F | 99.1 |
| 40°F | 121 |
| 45°F | 133 |
| 50°F | 145.9 |
| 55°F | 159.5 |
| 60°F | 174 |
| 70°F | 205.8 |
| 80°F | 241.5 |
| 90°F | 281.3 |
| 100°F | 325.7 |
| 110°F | 374.9 |
| 120°F | 429.3 |
| 130°F | 489.5 |
| 140°F | 555.8 |
R-32 in the A2L transition
R-32 is one of the two A2L refrigerants (with R-454B) taking over from R-410A as production of the older refrigerant phases down. It is actually a component of R-410A — R-410A is half R-32 by weight — so its pressures are similar but slightly higher, and it carries a lower global-warming potential. Because it is a single molecule rather than a blend, R-32 has no glide, so charging and P-T work read cleanly off one column.
As an A2L, R-32 is mildly flammable, so it comes with charge limits, leak detection, and service practices specific to the class. Read the saturation temperature off this chart the same way as any refrigerant — pressure to temperature, then compare with the line temperature for superheat or subcooling per the superheat & subcooling chart.
Common questions
What pressure does R-32 run at?
R-32 runs a few psi higher than R-410A at the same temperature — about 121 psig at 40°F and 326 psig at 100°F, versus R-410A’s 118 and 317. It is a single-component refrigerant with no glide, so one pressure column applies across the whole range.
Is R-32 flammable?
R-32 is an A2L refrigerant — mildly flammable with lower toxicity. A2Ls require the handling, leak-detection, and charge-limit precautions that come with the class, but they are far less flammable than the A3 hydrocarbons. R-32 is common in mini-splits and is one of the refrigerants replacing R-410A in new equipment.
Can I use R-32 in an R-410A system?
No — never drop one refrigerant into equipment designed for another. R-32 runs higher pressures than R-410A and is an A2L (flammable class), so it requires equipment, components, and service procedures listed for R-32. Use each refrigerant only in equipment designed and labeled for it.
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