HVAC Toolkit

Pressure-Temperature Charts

Saturation P-T data for common refrigerants

Select Refrigerant

HFC / HCFC

R-22 R-32 R-125 R-134a R-143a R-404A Z R-407C Z R-410A R-507A

Low GWP (HFO)

R-449A Z R-454B Z Low GWP R-513A R-1234yf Low GWP R-1234ze(E) Low GWP

Natural

R-290 (Propane) Low GWP R-600a (Isobutane) Low GWP R-744 (CO2) Low GWP R-717 (NH3) Low GWP

Pressure Unit

psig kPa bar kgf/cm²

R-744 (CO2)

Pure
GWP: 1
ODP: 0
Safety Class: A1

Natural refrigerant with ultra-low GWP. Operates at very high pressures (transcritical above 31.1°C). Non-flammable and non-toxic (A1). Requires specialized high-pressure equipment. Commonly used in supermarket cascade systems and heat pumps.

Quick P-T Lookup

kgf/cm²

* Results are interpolated from the P-T table data

Pressure Units: psig = Gauge pressure (relative to atmosphere) kPa / bar / kgf/cm² = Absolute pressure

°C °F kgf/cm²
-50 -58 6.9
-45 -49 8.3
-40 -40 9.9
-35 -31 11.7
-30 -22 13.8
-25 -13 16.2
-20 -4 18.8
-15 5 21.8
-10 14 25.1
-5 23 28.8
0 32 32.8
5 41 37.3
10 50 42.3
15 59 47.7
20 68 53.7
25 77 60.2
30 86 67.4
31 88 68.4