HVAC / refrigeration field reference
Refrigerant PT Lookup
Find saturation pressure or temperature in seconds. Select your refrigerant, enter a temperature or gauge pressure, and see the matching saturation value.
Reference range: −40°F to 150°F. Values between 5°F rows are linearly interpolated; no extrapolation.
| Saturation temp | Pressure |
|---|---|
| -6.7°C | 78.7 psig |
| -1.1°C | 97.4 psig |
| 4.4°C | 118.8 psig |
| 15.6°C | 170.7 psig |
| 21.1°C | 201.8 psig |
| 26.7°C | 236.5 psig |
| 37.8°C | 318.6 psig |
| 48.9°C | 419.4 psig |
Select any temperature to update the finder. Full selected-refrigerant chart ↓
Easy-to-read field chart
R-410A Pressure Temperature Chart
R-410A saturation pressure at 5°F intervals. Changing refrigerants updates this table; blends show bubble and dew separately.
| Temp °F | Temp °C | Pressure psig |
|---|---|---|
| -40°F | -40.0°C | 10.8 |
| -35°F | -37.2°C | 14.1 |
| -30°F | -34.4°C | 17.8 |
| -25°F | -31.7°C | 21.9 |
| -20°F | -28.9°C | 26.3 |
| -15°F | -26.1°C | 31.2 |
| -10°F | -23.3°C | 36.5 |
| -5°F | -20.6°C | 42.2 |
| 0°F | -17.8°C | 48.4 |
| 5°F | -15.0°C | 55.2 |
| 10°F | -12.2°C | 62.4 |
| 15°F | -9.4°C | 70.3 |
| 20°F | -6.7°C | 78.7 |
| 25°F | -3.9°C | 87.7 |
| 30°F | -1.1°C | 97.4 |
| 35°F | 1.7°C | 107.7 |
| 40°F | 4.4°C | 118.8 |
| 45°F | 7.2°C | 130.6 |
| 50°F | 10.0°C | 143.2 |
| 55°F | 12.8°C | 156.5 |
| 60°F | 15.6°C | 170.7 |
| 65°F | 18.3°C | 185.8 |
| 70°F | 21.1°C | 201.8 |
| 75°F | 23.9°C | 218.7 |
| 80°F | 26.7°C | 236.5 |
| 85°F | 29.4°C | 255.4 |
| 90°F | 32.2°C | 275.4 |
| 95°F | 35.0°C | 296.4 |
| 100°F | 37.8°C | 318.6 |
| 105°F | 40.6°C | 341.9 |
| 110°F | 43.3°C | 366.4 |
| 115°F | 46.1°C | 392.3 |
| 120°F | 48.9°C | 419.4 |
| 125°F | 51.7°C | 447.9 |
| 130°F | 54.4°C | 477.9 |
| 135°F | 57.2°C | 509.4 |
| 140°F | 60.0°C | 542.5 |
| 145°F | 62.8°C | 577.3 |
| 150°F | 65.6°C | 613.9 |
Figures are gauge pressure. Some low-temperature rows are below atmospheric pressure (negative psig), not negative absolute pressure. R-410A uses a practical single-column near-azeotropic PT reference.
Saturation Pressure vs. Temperature
View how the selected refrigerant’s pressure changes with temperature. For blends, the line shows bubble and dew reference curves.
Highlighted point: R-410A at 40°F, 118.8 psig. Use arrow keys when graph is focused to move by chart row.
Superheat and Subcooling Quick Check
Enter actual gauge pressures and line temperatures to calculate these two field indicators from the selected refrigerant. This does not determine whether a system is correctly charged.
Superheat · vapor / dew
Enter both measurements to calculate superheat.
Subcooling · liquid / bubble
Enter both measurements to calculate subcooling.
Superheat = measured suction-line temperature − dew saturation temperature. Subcooling = bubble saturation temperature − measured liquid-line temperature. Use OEM target specifications, properly stabilized equipment, and qualified service procedures.
Complete Refrigerant Pressure Temperature Comparison
Use this wide chart only when comparing multiple refrigerants. On smaller screens, the selected-refrigerant table above is easier to read.
View complete 7-refrigerant comparison (39 rows × 10 pressure columns)
| Temp °F | Temp °C | R-410Apsig | R-454B bubblepsig | R-454B dewpsig | R-32psig | R-22psig | R-134apsig | R-404A bubblepsig | R-404A dewpsig | R-407C bubblepsig | R-407C dewpsig |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -40°F | -40.0 | 10.8 | 9.5 | 8.4 | 11.0 | 0.6 | -7.3 | 4.9 | 4.3 | 2.7 | -2.3 |
| -35°F | -37.2 | 14.1 | 12.7 | 11.4 | 14.4 | 2.6 | -6.1 | 7.5 | 6.8 | 5.1 | -0.4 |
| -30°F | -34.4 | 17.8 | 16.2 | 14.8 | 18.2 | 4.9 | -4.8 | 10.3 | 9.6 | 7.7 | 1.6 |
| -25°F | -31.7 | 21.9 | 20.1 | 18.5 | 22.3 | 7.4 | -3.4 | 13.4 | 12.7 | 10.6 | 3.9 |
| -20°F | -28.9 | 26.3 | 24.3 | 22.6 | 26.8 | 10.2 | -1.8 | 16.8 | 16.0 | 13.7 | 6.5 |
| -15°F | -26.1 | 31.2 | 28.9 | 27.0 | 31.7 | 13.2 | 0.0 | 20.5 | 19.7 | 17.2 | 9.3 |
| -10°F | -23.3 | 36.5 | 33.9 | 31.8 | 37.1 | 16.5 | 1.9 | 24.6 | 23.6 | 20.9 | 12.3 |
| -5°F | -20.6 | 42.2 | 39.4 | 37.0 | 42.9 | 20.1 | 4.1 | 28.9 | 27.9 | 25.0 | 15.7 |
| 0°F | -17.8 | 48.4 | 45.3 | 42.7 | 49.3 | 24.0 | 6.5 | 33.7 | 32.6 | 29.5 | 19.4 |
| 5°F | -15.0 | 55.2 | 51.7 | 48.8 | 56.1 | 28.3 | 9.1 | 38.8 | 37.7 | 34.3 | 23.5 |
| 10°F | -12.2 | 62.4 | 58.5 | 55.4 | 63.5 | 32.8 | 11.9 | 44.3 | 43.1 | 39.5 | 27.9 |
| 15°F | -9.4 | 70.3 | 66.0 | 62.6 | 71.4 | 37.8 | 15.0 | 50.2 | 49.0 | 45.2 | 32.7 |
| 20°F | -6.7 | 78.7 | 73.9 | 70.3 | 80.0 | 43.1 | 18.4 | 56.6 | 55.3 | 51.2 | 37.9 |
| 25°F | -3.9 | 87.7 | 82.5 | 78.5 | 89.2 | 48.8 | 22.1 | 63.4 | 62.1 | 57.7 | 43.5 |
| 30°F | -1.1 | 97.4 | 91.7 | 87.4 | 99.1 | 55.0 | 26.1 | 70.7 | 69.3 | 64.7 | 49.6 |
| 35°F | 1.7 | 107.7 | 101.5 | 96.9 | 109.7 | 61.5 | 30.4 | 78.6 | 77.1 | 72.2 | 56.1 |
| 40°F | 4.4 | 118.8 | 112.0 | 107.0 | 121.0 | 68.6 | 35.0 | 86.9 | 85.4 | 80.2 | 63.2 |
| 45°F | 7.2 | 130.6 | 123.1 | 117.8 | 133.0 | 76.1 | 40.1 | 95.8 | 94.2 | 88.8 | 70.7 |
| 50°F | 10.0 | 143.2 | 135.0 | 129.3 | 145.9 | 84.1 | 45.4 | 105.3 | 103.6 | 97.9 | 78.8 |
| 55°F | 12.8 | 156.5 | 147.7 | 141.6 | 159.5 | 92.6 | 51.2 | 115.3 | 113.6 | 107.6 | 87.5 |
| 60°F | 15.6 | 170.7 | 161.1 | 154.6 | 174.1 | 101.6 | 57.4 | 126.0 | 124.2 | 118.0 | 96.8 |
| 65°F | 18.3 | 185.8 | 175.4 | 168.5 | 189.5 | 111.3 | 64.0 | 137.3 | 135.5 | 128.9 | 106.7 |
| 70°F | 21.1 | 201.8 | 190.5 | 183.1 | 205.8 | 121.4 | 71.1 | 149.3 | 147.4 | 140.5 | 117.3 |
| 75°F | 23.9 | 218.7 | 206.5 | 198.7 | 223.2 | 132.2 | 78.7 | 162.0 | 160.1 | 152.8 | 128.6 |
| 80°F | 26.7 | 236.5 | 223.4 | 215.2 | 241.5 | 143.6 | 86.7 | 175.4 | 173.4 | 165.8 | 140.5 |
| 85°F | 29.4 | 255.4 | 241.2 | 232.6 | 260.9 | 155.7 | 95.2 | 189.5 | 187.5 | 179.6 | 153.2 |
| 90°F | 32.2 | 275.4 | 260.0 | 251.0 | 281.3 | 168.4 | 104.3 | 204.5 | 202.4 | 194.1 | 166.7 |
| 95°F | 35.0 | 296.4 | 279.9 | 270.4 | 302.9 | 181.8 | 114.0 | 220.2 | 218.1 | 209.4 | 181.0 |
| 100°F | 37.8 | 318.6 | 300.8 | 290.9 | 325.7 | 195.9 | 124.2 | 236.8 | 234.6 | 225.5 | 196.1 |
| 105°F | 40.6 | 341.9 | 322.8 | 312.5 | 349.7 | 210.8 | 135.0 | 254.2 | 252.1 | 242.4 | 212.1 |
| 110°F | 43.3 | 366.4 | 345.9 | 335.2 | 374.9 | 226.4 | 146.4 | 272.5 | 270.4 | 260.3 | 229.0 |
| 115°F | 46.1 | 392.3 | 370.2 | 359.1 | 401.4 | 242.8 | 158.4 | 291.8 | 289.6 | 279.0 | 246.9 |
| 120°F | 48.9 | 419.4 | 395.7 | 384.3 | 429.3 | 260.0 | 171.2 | 312.1 | 309.9 | 298.6 | 265.8 |
| 125°F | 51.7 | 447.9 | 422.4 | 410.8 | 458.7 | 278.0 | 184.6 | 333.3 | 331.2 | 319.2 | 285.7 |
| 130°F | 54.4 | 477.9 | 450.5 | 438.7 | 489.5 | 296.9 | 198.7 | 355.7 | 353.5 | 340.7 | 306.7 |
| 135°F | 57.2 | 509.4 | 479.9 | 468.0 | 521.8 | 316.7 | 213.6 | 379.1 | 377.0 | 363.3 | 328.8 |
| 140°F | 60.0 | 542.5 | 510.7 | 498.8 | 555.8 | 337.4 | 229.2 | 403.7 | 401.7 | 387.0 | 352.1 |
| 145°F | 62.8 | 577.3 | 543.0 | 531.3 | 591.4 | 359.0 | 245.7 | 429.6 | 427.7 | 411.7 | 376.6 |
| 150°F | 65.6 | 613.9 | 576.8 | 565.4 | 628.8 | 381.7 | 262.9 | 456.8 | 455.1 | 437.5 | 402.5 |
How to Use a Refrigerant PT Chart
- Confirm the nameplate refrigerant. Similar pressures do not identify a refrigerant, and refrigerants are not interchangeable.
- Measure gauge pressure. Read the relevant service port under correct operating conditions. The table gives psig, not psia.
- Convert pressure to saturation temperature. For gliding blends, use dew for superheat and bubble for subcooling.
- Compare to the actual line temperature. Use the line temperatures to compute superheat or subcooling, then follow the OEM charging/diagnostic procedure.
Why bubble and dew differ: Blended refrigerants may evaporate or condense over a temperature glide. Saturated liquid (bubble) and saturated vapor (dew) are distinct conditions, so reversing pressure into temperature may correctly yield two different answers.
Safety: R-454B and R-32 are A2L refrigerants. Only use properly rated equipment and follow refrigerant-specific manufacturer procedures and applicable safety requirements. Never use a PT chart alone to set charge.
Refrigerants in This Chart
R-410A
A1 near-azeotropic blend. Practical single-column reference for many existing A/C systems.
R-454B
A2L blend for approved newer equipment; bubble and dew must be distinguished.
R-32
A2L single-component refrigerant; use the specific equipment manufacturer’s procedures.
R-22
Legacy A1 refrigerant reference for compatible existing systems.
R-134a
A1 single-component refrigerant with a single saturation curve.
R-404A
A1 near-azeotropic refrigerant blend; this chart retains separate bubble/dew data.
R-407C
A1 zeotropic blend with substantial temperature glide; correct phase selection is especially important.
Manufacturer PT Data and Method
These reference rows use the manufacturer values in the uploaded chart, which were checked against published Arkema, Daikin, and Chemours tables. They are not live operating pressure targets. Intermediate values use straight-line interpolation between adjacent 5°F rows; the page does not extrapolate.
- Arkema Forane Refrigerants Technical Digest — R-410A, R-32, R-22, R-134a, R-404A and R-407C base reference points
- Arkema R-404A Thermodynamic Properties — separate saturated liquid and vapor pressures
- Chemours Opteon XL41 (R-454B) Properties — bubble and dew psia converted to psig using 14.696 psia atmospheric reference
- Chemours Pressure–Temperature Guide — phase use for superheat and subcooling
- Daikin R-407C Technical Data — independent bubble/dew cross-check
Data scope: −40°F to 150°F, every 5°F. Gauge pressure: psig. SI conversion: 1 psi = 6.894757 kPa. Conversion: °C = (°F − 32) × 5/9. Values shown to one decimal place. Atmospheric reference of 14.696 psia is used for converting manufacturer absolute pressures to gauge.
Refrigerant Pressure Temperature Chart FAQ
What is the R-410A pressure at 40°F?
The chart gives 118.8 psig at 40°F saturation temperature. Actual system running pressure is not determined by temperature alone.
What is R-454B pressure at 40°F?
Approximately 112.0 psig bubble (saturated liquid) and 107.0 psig dew (saturated vapor) at 40°F on this manufacturer’s reference chart.
Do I use bubble or dew for superheat?
Use the dew/saturated-vapor reference temperature for superheat on gliding blends, unless the equipment manufacturer states otherwise.
Do I use bubble or dew for subcooling?
Use the bubble/saturated-liquid reference temperature for subcooling on gliding blends, unless the manufacturer specifies otherwise.
What is the difference between psig and psia?
Psig is gauge pressure relative to local atmospheric pressure; psia is absolute pressure. Near standard sea-level atmospheric pressure, psia is about psig + 14.696 psi.
Can a PT chart tell me the correct refrigerant charge?
No. A PT chart only relates pressure to saturation temperature. Diagnose or charge equipment using the manufacturer instructions, actual line temperatures, airflow, equipment load, and applicable methods.
Why are some low-temperature chart pressures negative?
Negative psig indicates a pressure below local atmospheric pressure (vacuum relative to the atmosphere), not a negative absolute pressure.