Free Tool
Refrigerant Pressure Temperature Chart
Instant saturation lookups for R-410A, R-22, R-134a, R-404A, R-407C, R-32, and R-454B. Type a temperature or pressure — the table updates in real time. Works on your phone in the field.
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R-410A Saturation Data
41 data points| Temperature | Pressure (psig) |
|---|---|
| -40°F | 10.1 |
| -35°F | 13.1 |
| -30°F | 16.4 |
| -25°F | 20.1 |
| -20°F | 24.2 |
| -15°F | 28.7 |
| -10°F | 33.7 |
| -5°F | 39.1 |
| 0°F | 45 |
| 5°F | 51.5 |
| 10°F | 58.6 |
| 15°F | 66.3 |
| 20°F | 74.6 |
| 25°F | 83.6 |
| 30°F | 93.4 |
| 35°F | 103.9 |
| 40°F | 115.2 |
| 45°F | 127.4 |
| 50°F | 140.5 |
| 55°F | 154.5 |
| 60°F | 169.5 |
| 65°F | 185.5 |
| 70°F | 202.6 |
| 75°F | 220.8 |
| 80°F | 240.2 |
| 85°F | 260.9 |
| 90°F | 282.9 |
| 95°F | 306.3 |
| 100°F | 331.2 |
| 105°F | 357.6 |
| 110°F | 385.6 |
| 115°F | 415.4 |
| 120°F | 447 |
| 125°F | 480.5 |
| 130°F | 515.9 |
| 135°F | 553.4 |
| 140°F | 593.2 |
| 145°F | 635.3 |
| 150°F | 679.8 |
| 155°F | 727 |
| 160°F | 776.9 |
Source: ASHRAE Fundamentals. Pressures are gauge (psig) at sea level. Negative values indicate vacuum conditions.
How to Use a PT Chart
Select your refrigerant using the tabs at the top of the tool. Then either type a temperature to find the corresponding saturation pressure, or type a pressure to find the saturation temperature. The table will highlight the nearest matching row and scroll it into view automatically.
Step 1
Select your refrigerant
Tap the pill for the refrigerant you are working with. The chart updates immediately.
Step 2
Enter temperature or pressure
Type into either input field. Values between data points are interpolated automatically.
Step 3
Read the result
The corresponding value appears instantly. The nearest table row highlights and scrolls into view for context.
Key Facts About Refrigerant Pressures
The pressure-temperature relationship is a fundamental property of every refrigerant, used by HVAC technicians to calculate superheat, subcooling, and diagnose system performance.
R-410A operates at approximately 60% higher pressure than R-22 at the same temperature, which is why R-410A systems require different components rated for higher pressures.
At a common operating temperature of 40°F, R-410A saturates at approximately 115 psig while R-22 saturates at approximately 67 psig and R-134a saturates at approximately 51 psig.
R-454B is the primary EPA-approved lower-GWP replacement for R-410A, with similar but slightly lower operating pressures. Many major manufacturers have begun shipping R-454B equipment for new installations.
Negative psig values (shown as “vac” in the table) indicate that the refrigerant is below atmospheric pressure at that temperature — common for R-134a below 0°F. These are called vacuum conditions and require special attention during service to prevent moisture ingress.
Frequently Asked Questions
What is a PT chart?
A PT chart (pressure-temperature chart) shows the relationship between a refrigerant's saturation pressure and its saturation temperature. At any given pressure, a refrigerant in a saturated state will have a corresponding temperature — and vice versa. HVAC technicians use PT charts daily to verify system operating conditions, calculate superheat and subcooling, and diagnose whether a system is overcharged, undercharged, or has a restriction.
How do I use a PT chart for leak detection?
Connect your manifold gauge set to the system's service ports. Read the suction and discharge pressures, then use the PT chart to find the corresponding saturation temperatures. Compare those against your actual measured temperatures using a thermometer or clamp probe. If actual suction line temperature is higher than saturation temperature, you have superheat — normal for residential systems is 10-20°F. Abnormally high superheat combined with low suction pressure can indicate a refrigerant leak.
Why does R-410A have higher pressure than R-22?
R-410A operates at approximately 60% higher pressure than R-22 at the same temperature. For example, at 40°F, R-410A saturates at roughly 115 psig while R-22 saturates at roughly 67 psig. This is due to R-410A's thermodynamic properties as a blend of R-32 and R-125. Because of these higher operating pressures, R-410A systems require components — compressors, copper tubing, service valves — specifically rated for higher pressure service. Never use R-22 components on an R-410A system.
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Start Free — No Credit CardLast updated: April 2026
Researched by the RefrigerantTrack Research Team