Instant saturation lookup
Interactive Refrigerant Pressure-Temperature Lookup
Enter a temperature or pressure. The result, graph marker, and nearby reference values update together.
Move across the graph, tap a curve, or use the left and right arrow keys to inspect values. Bubble and dew lines are shown separately for R-407C.
Saturation data—not target operating pressure
Running pressures vary with load, airflow, ambient conditions, equipment design, metering device, charge, and system state. Verify the refrigerant and follow the equipment manufacturer’s service procedure.
Crawlable default reference
R-410A Pressure-Temperature Table
Default saturation values at 5°F increments. Use the interactive chart above for other refrigerants and exact interpolated lookup.
Sort the table, copy a row, or use the advanced controls to filter and download the visible values.
No R-410A rows match the current filters.
Scroll horizontally to view additional columns and vertically to view additional rows. Column headers remain visible while scrolling.
| Copy | ||||
|---|---|---|---|---|
| -40°F | -40.0°C | 10.8 psig | 74 kPa(g) | |
| -35°F | -37.2°C | 14.3 psig | 99 kPa(g) | |
| -30°F | -34.4°C | 17.8 psig | 123 kPa(g) | |
| -25°F | -31.7°C | 22.1 psig | 152 kPa(g) | |
| -20°F | -28.9°C | 26.3 psig | 181 kPa(g) | |
| -15°F | -26.1°C | 31.4 psig | 216 kPa(g) | |
| -10°F | -23.3°C | 36.5 psig | 252 kPa(g) | |
| -5°F | -20.6°C | 42.5 psig | 293 kPa(g) | |
| 0°F | -17.8°C | 48.4 psig | 334 kPa(g) | |
| 5°F | -15.0°C | 55.4 psig | 382 kPa(g) | |
| 10°F | -12.2°C | 62.4 psig | 430 kPa(g) | |
| 15°F | -9.4°C | 70.5 psig | 486 kPa(g) | |
| 20°F | -6.7°C | 78.7 psig | 543 kPa(g) | |
| 25°F | -3.9°C | 88.1 psig | 607 kPa(g) | |
| 30°F | -1.1°C | 97.5 psig | 672 kPa(g) | |
| 35°F | 1.7°C | 108.2 psig | 746 kPa(g) | |
| 40°F | 4.4°C | 118.8 psig | 819 kPa(g) | |
| 45°F | 7.2°C | 130.7 psig | 901 kPa(g) | |
| 50°F | 10.0°C | 142.6 psig | 983 kPa(g) | |
| 55°F | 12.8°C | 155.4 psig | 1071 kPa(g) | |
| 60°F | 15.6°C | 168.2 psig | 1160 kPa(g) | |
| 65°F | 18.3°C | 185.0 psig | 1276 kPa(g) | |
| 70°F | 21.1°C | 201.8 psig | 1391 kPa(g) | |
| 75°F | 23.9°C | 219.4 psig | 1513 kPa(g) | |
| 80°F | 26.7°C | 237.0 psig | 1634 kPa(g) | |
| 85°F | 29.4°C | 255.6 psig | 1762 kPa(g) | |
| 90°F | 32.2°C | 274.1 psig | 1890 kPa(g) | |
| 95°F | 35.0°C | 295.6 psig | 2038 kPa(g) | |
| 100°F | 37.8°C | 317.0 psig | 2186 kPa(g) | |
| 105°F | 40.6°C | 340.9 psig | 2350 kPa(g) | |
| 110°F | 43.3°C | 364.7 psig | 2515 kPa(g) | |
| 115°F | 46.1°C | 392.0 psig | 2703 kPa(g) | |
| 120°F | 48.9°C | 419.4 psig | 2892 kPa(g) | |
| 125°F | 51.7°C | 447.6 psig | 3086 kPa(g) | |
| 130°F | 54.4°C | 475.9 psig | 3281 kPa(g) | |
| 135°F | 57.2°C | 506.9 psig | 3495 kPa(g) | |
| 140°F | 60.0°C | 538.0 psig | 3709 kPa(g) | |
| 145°F | 62.8°C | 572.5 psig | 3947 kPa(g) | |
| 150°F | 65.6°C | 607.0 psig | 4185 kPa(g) |
Gauge pressure uses 14.6959 psi as the standard-atmosphere reference. Negative gauge pressure is valid when saturation pressure is below atmospheric pressure.
Table tools and download
How to Read a Refrigerant PT Chart
- Select the refrigerant shown on the equipment nameplate.
- Choose temperature-to-pressure or pressure-to-temperature lookup.
- Use dew saturation temperature for superheat and bubble saturation temperature for subcooling when a blend has meaningful glide.
- Compare the saturation result with measured line temperature—not with an assumed “normal” operating pressure.
Important Limits and Safety Notes
Do not identify or charge a refrigerant from pressure alone. Different refrigerants can produce similar pressures at some temperatures, and mixed or contaminated refrigerant can produce misleading readings.
- The lookup is limited to −40°F through 150°F and does not extrapolate beyond that range.
- The page reports saturation values, not compressor discharge limits, charging targets, or equipment operating envelopes.
- R-22 is included as a legacy service reference; U.S. virgin production and import ended in 2020.
- Refrigerant safety, recovery, leak repair, and service-tool requirements remain refrigerant- and jurisdiction-specific.
Bubble Point, Dew Point, and Temperature Glide
- Bubble point
- The saturated-liquid condition where the first bubble of vapor forms. Use the bubble temperature for liquid-line subcooling on gliding blends.
- Dew point
- The saturated-vapor condition where the first droplet of liquid forms. Use the dew temperature for suction-line superheat on gliding blends.
- Temperature glide
- The difference between bubble and dew saturation temperatures at a common pressure. R-407C requires separate values; R-410A has comparatively small glide.
Gauge pressure versus absolute pressure
Property formulations calculate with absolute pressure. Field gauges usually display gauge pressure. This page converts between them using a standard atmosphere of 14.6959 psi, or 101.325 kPa.
Worked Refrigerant PT Examples
R-410A at 40°F
Lookup: Select R-410A, temperature → pressure, and enter 40°F.
Result: Approximately 118.8 psig saturation pressure.
Interpretation: This is the pressure at which R-410A changes phase at 40°F—not a universal suction-pressure target.
R-407C blend at 70°F
Lookup: Select R-407C and enter 70°F.
Result: The tool reports separate bubble and dew pressures because R-407C is zeotropic.
Interpretation: Do not substitute an unlabeled midpoint for bubble or dew data when calculating subcooling or superheat.
Using PT Data for Superheat and Subcooling
Superheat
Convert suction pressure to saturated-vapor temperature, then subtract that saturation temperature from the measured suction-line temperature.
Superheat = line temperature − dew saturation temperature
Subcooling
Convert liquid-side pressure to saturated-liquid temperature, then subtract the measured liquid-line temperature from that saturation temperature.
Subcooling = bubble saturation temperature − line temperature
Always use the equipment manufacturer’s specified charging method. Fixed-orifice and TXV systems may use different procedures and target values.
Data Basis, Scope, and Sources
Educational saturation lookup for common HVAC/R refrigerants; not a replacement for licensed property software or manufacturer service data.
The interactive curves use bounded interpolation between reviewed source-aligned checkpoints. No extrapolation is permitted. Values are displayed at field-reference precision rather than research-grade precision.
- CoolProp thermophysical-property projectSupports refrigerant equations of state, fluid limits, saturation states, and open-source provenance.
- NIST REFPROPAuthoritative commercial reference for thermodynamic and transport property validation; its proprietary database is not redistributed here.
- 2025 ASHRAE Handbook—Fundamentals, Chapter 30Supports bubble/dew interpretation and refrigerant thermophysical-property context.
Dataset and Review Details
- Publisher
- Turn2Engineering Editorial Team
- Model basis
- Source-aligned saturation checkpoints with bounded interpolation
- Default dataset
- R-410A, −40°F to 150°F
- Internal units
- °F and psig; converted directly to °C and kPa(g)
- Extrapolation
- Not permitted
- Rights status
- Original transformed reference; proprietary REFPROP/ASHRAE tables are not reproduced
Refrigerant Pressure-Temperature Chart FAQ
The chart gives saturation pressure for the selected refrigerant at that temperature. Actual running pressure depends on system design, load, airflow, ambient conditions, and operating state.
For a gliding blend, use dew saturation temperature for superheat and bubble saturation temperature for subcooling unless the equipment manufacturer specifies otherwise.
The chart describes equilibrium saturation. A running system may be superheated, subcooled, loaded unevenly, affected by airflow or ambient conditions, or measured with an inaccurate gauge.
No. Psig is referenced to atmospheric pressure, while psia is referenced to a vacuum. This page displays gauge pressure and uses absolute pressure only as the internal thermodynamic basis.
No. Pressure alone is not a reliable refrigerant identifier or charging method. Confirm the refrigerant from equipment documentation and use the specified service procedure.
Use the PT Chart as a Saturation Reference
Start with the refrigerant nameplate, enter a measured pressure or desired saturation temperature, and use the correct bubble or dew basis. Treat the result as one step in a complete manufacturer-approved diagnostic or charging procedure.