R-32 pressure-temperature chart
R-32 saturation pressures from -40 °F to 150 °F, in gauge pressure (psig). At 40 °F, R-32 saturates at 121.0 psig; at 105 °F, 349.6 psig.
R-32 PT chart (psig, every 5 °F)
| °F | °C | Pressure psig |
|---|---|---|
| -40 | -40.0 | 11.0 |
| -35 | -37.2 | 14.4 |
| -30 | -34.4 | 18.2 |
| -25 | -31.7 | 22.3 |
| -20 | -28.9 | 26.8 |
| -15 | -26.1 | 31.7 |
| -10 | -23.3 | 37.1 |
| -5 | -20.6 | 42.9 |
| 0 | -17.8 | 49.3 |
| 5 | -15.0 | 56.1 |
| 10 | -12.2 | 63.5 |
| 15 | -9.4 | 71.4 |
| 20 | -6.7 | 80.0 |
| 25 | -3.9 | 89.2 |
| 30 | -1.1 | 99.1 |
| 35 | 1.7 | 109.7 |
| 40 | 4.4 | 121.0 |
| 45 | 7.2 | 133.0 |
| 50 | 10.0 | 145.8 |
| 55 | 12.8 | 159.5 |
| 60 | 15.6 | 174.0 |
| 65 | 18.3 | 189.5 |
| 70 | 21.1 | 205.8 |
| 75 | 23.9 | 223.2 |
| 80 | 26.7 | 241.5 |
| 85 | 29.4 | 260.9 |
| 90 | 32.2 | 281.3 |
| 95 | 35.0 | 302.9 |
| 100 | 37.8 | 325.7 |
| 105 | 40.6 | 349.6 |
| 110 | 43.3 | 374.9 |
| 115 | 46.1 | 401.4 |
| 120 | 48.9 | 429.3 |
| 125 | 51.7 | 458.7 |
| 130 | 54.4 | 489.5 |
| 135 | 57.2 | 521.8 |
| 140 | 60.0 | 555.8 |
| 145 | 62.8 | 591.4 |
| 150 | 65.6 | 628.8 |
Need a reading between rows, or your elevation corrected? Use the tool above: type a temperature or a pressure and it fills in the other.
About R-32
R-32 is a single-component HFC and the other main replacement for R-410A in new AC and heat pumps (it is also half of R-410A). It is classed A2L, mildly flammable, so follow the manufacturer's A2L procedures and use tools and recovery equipment rated for A2L refrigerants.
It runs a little higher than R-410A: about 121 psig at 40 °F against 118. As a single component it has no glide, so the chart has one pressure column.
How to read a PT chart
A pressure-temperature chart gives the saturation temperature: the temperature at which the refrigerant boils or condenses at a given pressure. Inside the evaporator and condenser, where liquid and vapor are both present, pressure and temperature are locked together, so one gauge reading tells you the other.
- Find your pressure on the chart (or type it into the tool) and read the saturation temperature next to it.
- Superheat = suction line temperature − saturation temperature at suction pressure. Use the superheat calculator.
- Subcooling = saturation temperature at liquid line pressure − liquid line temperature. Use the subcooling calculator.
- Gauges read psig, pressure above the air around you. Charts are built for sea level (14.696 psi). At 5,000 ft your gauge reads about 2.5 psi high against the chart; enter your elevation in the tool and it corrects for it.
Working on refrigerant circuits?
Opening the refrigerant circuit on stationary equipment using the refrigerants on this page requires EPA Section 608 certification, and suppliers can only sell you most refrigerants if you have it. See how to get EPA 608 certified or take the free EPA 608 practice tests.
Where the numbers come from
Saturation pressures for R-32: NIST Chemistry WebBook (NIST Standard Reference Database 69). Converted to gauge pressure at sea level (psig = psia − 14.696); below 0 psig the chart shows inches of mercury of vacuum. Values are for pure refrigerant: air, moisture or a mixed charge will throw readings off. The equipment manufacturer's charging chart and data plate govern.
FAQ
What is R-32 pressure at 40 degrees?
121.0 psig at sea level.
Is R-32 higher pressure than R-410A?
Slightly. At 40 °F R-32 is about 121 psig against 118 for R-410A, and at 105 °F about 350 against 342.
Is this tool free?
Yes. No account, no email, no download. It runs in your browser and works on your phone at the unit.