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Refrigerant P-T Chart & Saturation Calculator

Interactive pressure-temperature saturation data for 13 common refrigerants including next-generation low-GWP replacements

Free interactive refrigerant P-T chart for HVAC technicians, refrigeration mechanics, and service engineers. Look up saturation temperature from gauge pressure or saturation pressure from temperature for R-410A, R-22, R-134a, R-404A, R-407C, R-32, R-290, R-1234yf, R-454B, R-513A, R-448A, R-449A, and R-744 (CO2). Shows separate bubble and dew point temperatures for R-407C (a zeotropic blend with significant glide), plus superheat and subcooling measurement reminders. Includes GWP, ODP, safety classification, and phase-out status for every refrigerant.

Pro Tip: For zeotropic blends like R-407C (which has about 8°F of temperature glide), use the dew point for superheat measurement and the bubble point for subcooling measurement. This tool shows both values and explains which to use. R-410A has negligible glide and can be treated as a pure substance for P-T purposes.

Calculate superheat and subcooling from line temperatures

Superheat & Subcooling Calculator →

Look up psychrometric air properties

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Refrigerant P-T Chart
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How It Works

  1. Select a Refrigerant

    Choose from 13 common refrigerants organized by group: Common (R-410A, R-22, R-134a, R-404A), Low-GWP (R-32, R-454B, R-1234yf, R-513A), Alternatives (R-407C, R-448A, R-449A, R-290), and Specialty (R-744 CO2).

  2. Choose Your Mode

    Use Pressure->Temperature to convert a gauge reading to saturation temp, Temperature->Pressure to find your target suction or discharge pressure, or Table mode for a full saturation table.

  3. Read the Results

    For pure and near-azeotropic refrigerants, you get a single saturation temperature. For R-407C (a zeotropic blend with significant glide), you get separate bubble and dew point values with guidance on which to use for superheat vs subcooling.

Built For

  • HVAC service technicians converting manifold gauge readings to saturation temperatures in the field
  • Refrigeration mechanics setting superheat and subcooling targets for system charging
  • Engineers evaluating low-GWP replacement refrigerants (R-454B for R-410A, R-513A for R-134a)
  • Instructors and apprentices learning pressure-temperature relationships for different refrigerants
  • Equipment specifiers comparing operating pressures across refrigerant options for new system design

References

  • ASHRAE Handbook , Fundamentals, Thermophysical Properties of Refrigerants
  • ASHRAE Standard 34 , Designation and Safety Classification of Refrigerants
  • Chemours , Refrigerant Product Data Sheets (R-407C, R-404A, R-134a, R-410A)
  • Honeywell , Solstice Product Line Technical Data (R-1234yf, R-448A, R-449A, R-513A)
  • Daikin/Chemours , Opteon XL41 (R-454B) Technical Data Sheet

Frequently Asked Questions

Zeotropic blends (like R-407C) are mixtures of refrigerants with different boiling points. As the blend evaporates, the lighter component boils first, so the temperature changes as the mixture changes phase. The difference between the bubble point (where the first vapor appears) and the dew point (where the last liquid evaporates) is the glide. R-407C has about 8°F of glide. For superheat measurement, you use the dew point; for subcooling, you use the bubble point.
Global Warming Potential (GWP) measures how much heat a greenhouse gas traps over 100 years relative to CO2 (which has a GWP of 1). R-410A has a GWP of 2,088 , meaning 1 pound of R-410A traps as much heat as 2,088 pounds of CO2. The AIM Act and Kigali Amendment are phasing down high-GWP refrigerants. R-454B (GWP 466) is the leading R-410A replacement.
ASHRAE Standard 34 classifies refrigerants by toxicity (A = lower toxicity, B = higher) and flammability (1 = no flame propagation, 2L = lower flammability with limited burning velocity, 2 = flammable, 3 = highly flammable). Most traditional refrigerants are A1. Many new low-GWP options are A2L (mildly flammable) , R-32, R-454B, and R-1234yf are all A2L. R-290 (propane) is A3.
R-22 production and import ceased in January 2020, but millions of existing systems still use it. Techs service these systems daily using recovered/recycled R-22. The P-T data is still essential for diagnosis and charging. R-22 will remain in service equipment for years until all legacy systems are replaced.
Disclaimer: Saturation data is interpolated from published ASHRAE and manufacturer tables. For zeotropic blends, composition shift during leaks can alter actual saturation properties. Always verify with a calibrated digital manifold for critical measurements.

Learn More

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Reading the Refrigerant P-T Chart: Superheat, Subcooling, and Blend Glide

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