A refrigerant PT chart pairs saturation pressure with saturation temperature so you can match a gauge reading to a temperature. Pick the refrigerant first, then read the chart for that refrigerant. For blends, bubble and dew points matter, so superheat and subcooling use different reference points.
Pick a refrigerant
Which PT chart do I need? Use the chart that matches the refrigerant in the system, such as R-454B or R-32 for A2L refrigerants, and R-410A, R-22, R-134a, or R-404A for A1 refrigerants. If you are not sure, start with the system nameplate and then check the matching refrigerant PT chart page for that refrigerant.
How to read a PT chart
How do you use a PT chart? Find the refrigerant, locate the gauge pressure, and then read across to the saturation temperature. Saturation is the point where liquid and vapor can exist together at the same pressure. For blends, use the correct reference point for the job, and compare the result with a superheat and subcooling calculator when you need a quick check.
Safety classes
What is A2L? A2L is a safety classification for refrigerants with lower flammability, and A1 is a classification for refrigerants with no flame propagation under the same system used for classification. If you are handling an A2L refrigerant such as R-454B or R-32, review the handling guidance in our A2L refrigerant handling guide. You can also jump to a specific chart like R-410A or R-22.
Reference only. Verify with manufacturer data and gauges. Follow the manufacturer chart and EPA rules. This site is not an approval from EPA.