R-134a PT table
The table below is saturation pressure calculated with CoolProp. Reference only. Verify with manufacturer data and gauges.
For a broader overview, visit the PT chart hub or start at the HVAC Refrigerant Log home page.
Pressure in psig and temperature in F
The chart will pair gauge pressure with saturation temperature. Use it as a reference only, and confirm the system target on the equipment data plate.
Metric view
A metric view can be added alongside the imperial view once the source values are verified.
Source and revision
Values are calculated with CoolProp, not copied from a manufacturer chart. See the glossary for chart terms used on this site.
Bubble point and dew point
For blends, subcooling and superheat can use different reference points. This page will note which point to use once the manufacturer or ASHRAE guidance is verified.
Glide
Glide is the difference between the temperature where a blend starts to boil and the temperature where it finishes. Use the correct reference point for the calculation you are doing.
Using the R-134a chart with gauges
Match your gauge reading to the chart, then compare the result with the system target. If you want a guided check, use the superheat and subcooling calculator after the chart values are confirmed.
Superheat
Superheat compares the suction line temperature to the saturation temperature at the measured pressure. Follow the equipment data plate for the correct target.
Subcooling
Subcooling compares liquid line temperature to the saturation temperature at the measured pressure. Use the correct reference method for the refrigerant type.
R-134a safety and handling notes
R-134a is an HFC refrigerant. Before servicing, confirm the safety class and follow the recovery steps required by your equipment and local rules. See our AIM Act guide for related rule updates.
Safety class
The safety class and handling notes should be taken from the verified product documentation before use.
Recovery
Recover refrigerant according to the applicable equipment instructions and legal requirements. Do not vent refrigerant.
Compare with other refrigerants
R-134a is often compared with other common refrigerants, but the right comparison depends on system design, charge, and service targets. Check the correct chart for each refrigerant before interpreting readings.
For more maintenance reminders and record keeping, you can also explore the waitlist page.
Reference only. Verify with manufacturer data and gauges. Follow the manufacturer chart and EPA rules. This site is not an approval from EPA.
| Temp F | Saturation psig |
|---|---|
| -20 | -1.8 |
| -10 | 1.9 |
| 0 | 6.5 |
| 10 | 11.9 |
| 20 | 18.4 |
| 30 | 26.1 |
| 40 | 35.0 |
| 50 | 45.4 |
| 60 | 57.4 |
| 70 | 71.1 |
| 80 | 86.7 |
| 90 | 104.3 |
| 100 | 124.2 |
| 110 | 146.4 |
| 120 | 171.2 |
CoolProp is used under the MIT license. This page is not an approval from EPA.