R-32 PT Chart
HVAC Cheat Sheet · hvaccheatsheet.com/charts/r-32-pt-chart
At 40°F, R-32 is about 121.0 psig. At 100°F it's about 325.7 psig. Look up any reading below, or print the full chart.
A single-component A2L refrigerant used in many mini-splits and in newer ducted systems. It runs slightly higher pressure than R-410A.
Prints the full chart on one page.
| °F | °C | psig |
|---|---|---|
| -38 | -38.9 | 12.4 |
| -36 | -37.8 | 13.7 |
| -34 | -36.7 | 15.2 |
| -32 | -35.6 | 16.6 |
| -30 | -34.4 | 18.2 |
| -28 | -33.3 | 19.8 |
| -26 | -32.2 | 21.4 |
| -24 | -31.1 | 23.2 |
| -22 | -30.0 | 25.0 |
| -20 | -28.9 | 26.8 |
| -18 | -27.8 | 28.7 |
| -16 | -26.7 | 30.7 |
| -14 | -25.6 | 32.8 |
| -12 | -24.4 | 34.9 |
| -10 | -23.3 | 37.1 |
| -8 | -22.2 | 39.4 |
| -6 | -21.1 | 41.7 |
| -4 | -20.0 | 44.1 |
| -2 | -18.9 | 46.7 |
| 0 | -17.8 | 49.2 |
| 2 | -16.7 | 51.9 |
| 4 | -15.6 | 54.7 |
| 6 | -14.4 | 57.5 |
| 8 | -13.3 | 60.5 |
| 10 | -12.2 | 63.5 |
| 12 | -11.1 | 66.6 |
| 14 | -10.0 | 69.8 |
| 16 | -8.9 | 73.1 |
| 18 | -7.8 | 76.5 |
| 20 | -6.7 | 80.0 |
| 22 | -5.6 | 83.6 |
| 24 | -4.4 | 87.3 |
| 26 | -3.3 | 91.1 |
| 28 | -2.2 | 95.1 |
| 30 | -1.1 | 99.1 |
| 32 | 0.0 | 103.2 |
| 34 | 1.1 | 107.5 |
| 36 | 2.2 | 111.8 |
| 38 | 3.3 | 116.3 |
| 40 | 4.4 | 121.0 |
| 42 | 5.6 | 125.7 |
| 44 | 6.7 | 130.5 |
| 46 | 7.8 | 135.5 |
| 48 | 8.9 | 140.6 |
| 50 | 10.0 | 145.8 |
| 52 | 11.1 | 151.2 |
| 54 | 12.2 | 156.7 |
| 56 | 13.3 | 162.4 |
| 58 | 14.4 | 168.1 |
| 60 | 15.6 | 174.0 |
| 62 | 16.7 | 180.1 |
| 64 | 17.8 | 186.3 |
| 66 | 18.9 | 192.7 |
| 68 | 20.0 | 199.2 |
| 70 | 21.1 | 205.8 |
| 72 | 22.2 | 212.6 |
| 74 | 23.3 | 219.6 |
| 76 | 24.4 | 226.7 |
| 78 | 25.6 | 234.0 |
| 80 | 26.7 | 241.5 |
| 82 | 27.8 | 249.1 |
| 84 | 28.9 | 256.9 |
| 86 | 30.0 | 264.9 |
| 88 | 31.1 | 273.0 |
| 90 | 32.2 | 281.3 |
| 92 | 33.3 | 289.8 |
| 94 | 34.4 | 298.5 |
| 96 | 35.6 | 307.4 |
| 98 | 36.7 | 316.4 |
| 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 |
| °F | °C | psig |
|---|---|---|
| -38 | -38.9 | 12.4 |
| -36 | -37.8 | 13.7 |
| -34 | -36.7 | 15.2 |
| -32 | -35.6 | 16.6 |
| -30 | -34.4 | 18.2 |
| -28 | -33.3 | 19.8 |
| -26 | -32.2 | 21.4 |
| -24 | -31.1 | 23.2 |
| -22 | -30.0 | 25.0 |
| -20 | -28.9 | 26.8 |
| -18 | -27.8 | 28.7 |
| -16 | -26.7 | 30.7 |
| -14 | -25.6 | 32.8 |
| -12 | -24.4 | 34.9 |
| -10 | -23.3 | 37.1 |
| -8 | -22.2 | 39.4 |
| -6 | -21.1 | 41.7 |
| -4 | -20.0 | 44.1 |
| -2 | -18.9 | 46.7 |
| 0 | -17.8 | 49.2 |
| 2 | -16.7 | 51.9 |
| 4 | -15.6 | 54.7 |
| 6 | -14.4 | 57.5 |
| 8 | -13.3 | 60.5 |
| 10 | -12.2 | 63.5 |
| 12 | -11.1 | 66.6 |
| 14 | -10.0 | 69.8 |
| 16 | -8.9 | 73.1 |
| 18 | -7.8 | 76.5 |
| 20 | -6.7 | 80.0 |
| 22 | -5.6 | 83.6 |
| 24 | -4.4 | 87.3 |
| 26 | -3.3 | 91.1 |
| 28 | -2.2 | 95.1 |
| 30 | -1.1 | 99.1 |
| 32 | 0.0 | 103.2 |
| 34 | 1.1 | 107.5 |
| 36 | 2.2 | 111.8 |
| 38 | 3.3 | 116.3 |
| 40 | 4.4 | 121.0 |
| °F | °C | psig |
|---|---|---|
| 42 | 5.6 | 125.7 |
| 44 | 6.7 | 130.5 |
| 46 | 7.8 | 135.5 |
| 48 | 8.9 | 140.6 |
| 50 | 10.0 | 145.8 |
| 52 | 11.1 | 151.2 |
| 54 | 12.2 | 156.7 |
| 56 | 13.3 | 162.4 |
| 58 | 14.4 | 168.1 |
| 60 | 15.6 | 174.0 |
| 62 | 16.7 | 180.1 |
| 64 | 17.8 | 186.3 |
| 66 | 18.9 | 192.7 |
| 68 | 20.0 | 199.2 |
| 70 | 21.1 | 205.8 |
| 72 | 22.2 | 212.6 |
| 74 | 23.3 | 219.6 |
| 76 | 24.4 | 226.7 |
| 78 | 25.6 | 234.0 |
| 80 | 26.7 | 241.5 |
| 82 | 27.8 | 249.1 |
| 84 | 28.9 | 256.9 |
| 86 | 30.0 | 264.9 |
| 88 | 31.1 | 273.0 |
| 90 | 32.2 | 281.3 |
| 92 | 33.3 | 289.8 |
| 94 | 34.4 | 298.5 |
| 96 | 35.6 | 307.4 |
| 98 | 36.7 | 316.4 |
| 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 |
- No glide: one column works for superheat and subcooling.
- Pressures run about 2–10 psig above R-410A across the normal service range, so don't read an R-32 system on an R-410A chart.
- A2L means mildly flammable. Use A2L-rated tools and follow the manufacturer's instructions.
- Gauge pressure at sea level. At high elevation a gauge reads slightly higher for the same temperature (roughly 0.5 psi per 1,000 ft).
How to use a PT chart
A PT chart gives the temperature at which a refrigerant boils or condenses at a given pressure. Read your gauge, find the saturation temperature, then compare it with the line temperature you measure:
- Superheat = suction line temperature − saturation temperature at suction pressure.
- Subcooling = saturation temperature at liquid pressure − liquid line temperature.
The superheat and subcooling calculator does the math, and how to read a PT chart walks through it step by step. Always charge to the equipment manufacturer's instructions.
Source
Values are from the Daikin Comfort Technologies A1 vs. A2L pressure-temperature chart (data provided by Weitron), and were spot-checked against other manufacturer charts. Interpolated lookups are estimates.
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Field reference only. Confirm against the refrigerant manufacturer's data and the equipment manufacturer's charging instructions. Spot an error? Tell us.