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Interactive P/T lookup for R-410A, R-22, R-32, R-454B, R-134a, and R-404A. Enter pressure or temperature to find the corresponding value instantly.
Every HVAC technician needs to know the pressure-temperature relationship of the refrigerant they're working with. This relationship is fundamental to diagnosing charge levels, verifying subcooling and superheat, and identifying system problems.
Connect your gauges to the service ports. Read the high-side (liquid line) and low-side (suction line) pressures. Use this chart to find the corresponding saturation temperature. Compare that to the actual line temperature measured with a thermometer to calculate subcooling or superheat.
R-410A operates at roughly 60% higher pressures than R-22. At 45°F evaporator temperature, R-22 runs about 76 PSIG while R-410A runs about 128 PSIG. This is why R-410A systems require different components rated for higher pressures, including capacitors, contactors, and service valves.
As the industry transitions away from R-410A, R-32 and R-454B are becoming the standard for new equipment. Both have lower GWP (Global Warming Potential). R-454B is the direct R-410A replacement used by Carrier, while R-32 is used by Daikin and others. This chart includes both for field reference.
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