Instant saturation lookup
Interactive Refrigerant Pressure-Temperature Lookup
Enter a temperature or pressure. The saturation result and graph marker 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 PT reference
Refrigerant Pressure-Temperature Reference
Use the working lookup above for instant conversion, then use this reference area for refrigerant coverage, bubble/dew guidance, and the detailed R-410A table.
Common Refrigerants at a Glance
This page keeps the proven interactive lookup unchanged for five common refrigerants. R-454B and R-32 are included as current reference topics with manufacturer-source guidance so the page remains useful for newer A2L equipment without mixing unverified values into the working calculator.
| Refrigerant | Safety class | PT behavior | On this page |
|---|---|---|---|
| R-410A | A1 | Near-azeotropic; very small glide | Interactive lookup + full table |
| R-454B | A2L | Blend; use bubble/dew manufacturer data | Modern refrigerant guidance |
| R-32 | A2L | Single-component saturation curve | Modern refrigerant guidance |
| R-22 | A1 | Single-component saturation curve | Interactive legacy reference |
| R-134a | A1 | Single-component saturation curve | Interactive lookup |
| R-404A | A1 | Near-azeotropic blend | Interactive field-reference curve |
| R-407C | A1 | Zeotropic; separate bubble/dew values | Interactive bubble/dew lookup |
R-410A Pressure-Temperature Table
Detailed R-410A saturation values at 5°F increments. Sort, search, copy a row, or download the visible values after the shared CORE enhancement loads.
Search by temperature or pressure, or use the advanced controls for filtering and CSV download.
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.
Refrigerant-Specific PT Chart Guidance
R-410A Pressure Temperature Chart
R-410A is a near-azeotropic A1 blend with very small temperature glide. The interactive lookup and detailed table on this page provide the primary field reference for temperature-to-pressure and pressure-to-temperature conversion.
R-454B Pressure Temperature Chart
R-454B is an A2L blend used in newer air-conditioning and heat-pump equipment. For superheat and subcooling work, use manufacturer-published saturated-vapor (dew) and saturated-liquid (bubble) values rather than assuming it is identical to R-410A.
R-32 Pressure Temperature Chart
R-32 is an A2L single-component refrigerant, so it follows one saturation pressure-temperature relationship rather than a bubble/dew glide pair. Verify service values against the equipment manufacturer’s R-32 documentation.
R-22 Pressure Temperature Chart
R-22 remains useful as a legacy service reference. The interactive lookup is intended for saturation reference only; it does not establish a target suction or discharge pressure for a running system.
R-134a Pressure Temperature Chart
R-134a is a single-component A1 refrigerant. A PT lookup maps equilibrium saturation pressure and temperature; measured line temperature is still required when calculating superheat or subcooling.
R-404A Pressure Temperature Chart
R-404A is a near-azeotropic A1 blend. The calculator provides a practical field-reference curve, but manufacturer blend data should be used whenever a procedure specifically calls for separate saturated-liquid or saturated-vapor values.
R-407C Pressure Temperature Chart
R-407C has meaningful temperature glide. Use the dew value for superheat and the bubble value for subcooling; the interactive lookup displays both values separately.
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.
- Chemours Pressure-Temperature Guide for A/CManufacturer reference covering R-410A, R-454B, R-407C, R-22, and R-32, including dew/bubble guidance for superheat and subcooling.
- Daikin R-32 Service and Troubleshooting ReferenceManufacturer service documentation with R-32 saturated pressure-temperature reference values.
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.
No. R-454B has its own pressure-temperature relationship and is a gliding A2L blend. Use the equipment or refrigerant manufacturer’s R-454B bubble/dew data rather than substituting an R-410A value.
No. R-32 is a single-component refrigerant, so it uses one saturation pressure-temperature curve. Follow the equipment manufacturer’s A2L service procedures and published R-32 PT data.
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.