R-410A Pressure-Temperature Chart
Saturation pressure in psig by temperature for R-410A, from -40°F to 140°F — the gauge pressures a technician reads to find the saturation temperature for superheat and subcooling. R-410A is near-azeotropic, so a single pressure column applies. Values are cross-checked against manufacturer P-T charts.
R-410A saturation pressure
| Temp (°F) | Pressure (psig) |
|---|---|
| -40°F | 11 |
| -30°F | 18 |
| -20°F | 26 |
| -10°F | 37 |
| 0°F | 48 |
| 10°F | 62 |
| 20°F | 79 |
| 30°F | 97 |
| 40°F | 118 |
| 45°F | 130 |
| 50°F | 142 |
| 55°F | 156 |
| 60°F | 170 |
| 70°F | 201 |
| 80°F | 236 |
| 90°F | 275 |
| 100°F | 317 |
| 110°F | 366 |
| 120°F | 418 |
| 130°F | 477 |
| 140°F | 540 |
How to use a P-T chart
A pressure-temperature chart is the bridge between the gauge and the thermometer. Read the pressure on the low side, find it in the table, and the matching temperature is the refrigerant's saturation temperature in the evaporator. Subtract that from the actual suction-line temperature and you have superheat. Do the same on the high side to get the condensing saturation temperature, then subtract the liquid-line temperature for subcooling. The superheat & subcooling chart walks through both, and the refrigerant charge calculator runs the numbers.
R-410A runs at noticeably higher pressures than the R-22 it replaced — compare the R-22 chart, where 40°F is about 69 psig against R-410A's 118 psig. That is why R-410A gauges, hoses, and components are rated for higher pressure and are not interchangeable with R-22 equipment.
Common questions
What is the normal operating pressure for R-410A?
It depends on temperature, since the P-T chart tracks saturation. On a typical cooling system the low side runs around a 40°F saturation temperature — about 118 psig — and the high side around 110–120°F saturation, roughly 366–418 psig. Actual gauge readings depend on indoor and outdoor conditions and the charge; always compare against target superheat or subcooling, not just raw pressure.
Is R-410A being phased out?
Yes — R-410A production is being phased down under the AIM Act HFC phasedown, and as of the 2025 changeover new residential and light-commercial equipment uses the A2L refrigerants R-454B and R-32 instead. R-410A remains widely serviced in installed equipment for years to come.
Does R-410A have temperature glide?
Almost none. R-410A is a near-azeotropic blend of R-32 and R-125 (50/50), so its bubble-point and dew-point pressures differ by only about 1 psi across the whole range. That is why this chart uses a single pressure column, unlike the zeotropic R-454B, which needs separate liquid and vapor columns.
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