The HFO R-1234yf is the refrigerant of the future. Or, at least, that is how it has been marketed. Yf was the first HFO refrigerant to see mainstream attention. A few years back there was immense pressure in the European Union to stop using the HFC R-134a for automotive air conditioning. The pressure was there due to the extremely high Global Warming Potential (GWP) that R-134a has. R-134a has a GWP of one-thousand four-hundred and thirty. It is classified as a super pollutant.
The answer to the world’s problems came with the announcement of the new HFO refrigerant known as R-1234yf. Yf refrigerant has a Global Warming Potential of only four. That is a huge difference when comparing it to other refrigerants on the market today. The only downside for yf is that it is rated as slightly flammable or 2L from ASHRAE and other air conditioning organizations.
The European Union quickly phased down and out R-134a and had their new vehicles start taking R-1234yf. While the acceptance of yf is much slower here in the United States there are numerous vehicle manufacturers who have begun using this refrigerant in their newer model vehicles. With each year that passes more and more vehicles begin taking yf.
To read more about 1234yf please check out our official refrigerant fact sheet on yf.
1234yf PT Chart
One of the very first steps when it comes to diagnosing a vehicle’s air conditioner is understanding the temperature and the current pressure that your system is operating at. Having these facts along with the saturation point, the subcool, and the superheat numbers for the refrigerant you are working on are essential when it comes to really understanding what is going wrong with your system.
The chart below details the pressures and the saturation point, or boiling point, R-1234yf:
| °F | °C | PSI | KPA |
| -94 | -70 | -9.82 | -67.7 |
| -90.4 | -68 | -9.26 | -63.8 |
| -86.8 | -66 | -8.65 | -59.6 |
| -83.2 | -64 | -7.99 | -55.1 |
| -79.6 | -62 | -7.27 | -50.1 |
| -76 | -60 | -6.49 | -44.7 |
| -72.4 | -58 | -5.65 | -39.0 |
| -68.8 | -56 | -4.73 | -32.6 |
| -65.2 | -54 | -3.75 | -25.9 |
| -61.6 | -52 | -2.69 | -18.5 |
| -58 | -50 | -1.55 | -10.7 |
| -54.4 | -48 | -0.33 | -2.3 |
| -50.8 | -46 | 0.99 | 6.8 |
| -47.2 | -44 | 2.39 | 16.5 |
| -43.6 | -42 | 3.89 | 26.8 |
| -40 | -40 | 5.49 | 37.9 |
| -36.4 | -38 | 7.19 | 49.6 |
| -32.8 | -36 | 9.01 | 62.1 |
| -29.2 | -34 | 10.94 | 75.4 |
| -25.6 | -32 | 12.99 | 89.6 |
| -22 | -30 | 15.17 | 104.6 |
| -18.4 | -28 | 17.47 | 120.5 |
| -14.8 | -26 | 19.91 | 137.3 |
| -11.2 | -24 | 22.49 | 155.1 |
| -7.6 | -22 | 25.21 | 173.8 |
| -4 | -20 | 28.08 | 193.6 |
| -0.4 | -18 | 31.11 | 214.5 |
| 3.2 | -16 | 34.29 | 236.4 |
| 6.8 | -14 | 37.64 | 259.5 |
| 10.4 | -12 | 41.17 | 283.9 |
| 14 | -10 | 44.87 | 309.4 |
| 17.6 | -8 | 48.75 | 336.1 |
| 21.2 | -6 | 52.82 | 364.2 |
| 24.8 | -4 | 57.09 | 393.6 |
| 28.4 | -2 | 61.56 | 424.4 |
| 32 | 0 | 66.23 | 456.6 |
| 35.6 | 2 | 71.11 | 490.3 |
| 39.2 | 4 | 76.21 | 525.4 |
| 42.8 | 6 | 81.54 | 562.2 |
| 46.4 | 8 | 87.09 | 600.5 |
| 50 | 10 | 92.89 | 640.5 |
| 53.6 | 12 | 98.92 | 682.0 |
| 57.2 | 14 | 105.21 | 725.4 |
| 60.8 | 16 | 111.75 | 770.5 |
| 64.4 | 18 | 118.55 | 817.4 |
| 68 | 20 | 125.63 | 866.2 |
| 71.6 | 22 | 132.98 | 916.9 |
| 75.2 | 24 | 140.62 | 969.5 |
| 78.8 | 26 | 148.54 | 1024.1 |
| 82.4 | 28 | 156.77 | 1080.9 |
| 86 | 30 | 165.3 | 1139.7 |
| 89.6 | 32 | 174.15 | 1200.7 |
| 93.2 | 34 | 183.32 | 1263.9 |
| 96.8 | 36 | 192.82 | 1329.4 |
| 100.4 | 38 | 202.65 | 1397.2 |
| 104 | 40 | 212.85 | 1467.5 |
| 107.6 | 42 | 223.39 | 1540.2 |
| 111.2 | 44 | 234.29 | 1615.4 |
| 114.8 | 46 | 245.57 | 1693.1 |
| 118.4 | 48 | 257.24 | 1773.6 |
| 122 | 50 | 269.31 | 1856.8 |
| 125.6 | 52 | 281.76 | 1942.7 |
| 129.2 | 54 | 94.75 | 653.3 |
| 132.8 | 56 | 100.09 | 690.1 |
| 136.4 | 58 | 105.62 | 728.2 |
| 140 | 60 | 111.34 | 767.7 |
| 143.6 | 62 | 117.26 | 808.5 |
| 147.2 | 64 | 123.38 | 850.7 |
| 150.8 | 66 | 129.71 | 894.3 |
| 154.4 | 68 | 136.26 | 939.5 |
| 158 | 70 | 143 | 986.0 |
Conclusion
There you have it folks. I hope this article was helpful and if you find that something is inaccurate here in my chart please do not hesitate to reach out to me. I have sourced this the best I could but there is always going to be conflicting data. I’ve seen it multiple times on various refrigerants. I’ll search for a refrigerant’s pressure chart and get various results all showing different pounds per square inch temperatures.
The aim with this article is to give you accurate information so again, if you see anything incorrect please let me know by contacting me here. On top of this post we are also working on a comprehensive refrigerant pressure/temperature listing. The goal is to have every refrigerant out there listed with a pressure/temperature chart that is easily available.