Refrigerant PT Chart

Pressure-temperature chart for R-410A, R-32, R-454B, R-22 and R-404A. Enter a gauge pressure to get the saturation temperature, or a temperature to get the pressure — then scan the full chart below.

Refrigerant

Reading Taken On

Gauge Pressure (psig)

Saturation Temperature

—

Enter a value above and click calculate.

R-410A PT Chart

Pressures are gauge (psig). R-410A has a single saturation curve, so one pressure column covers liquid and vapour.

Temp (°F)	Pressure (psig)
-40	10.7
-35	14.0
-30	17.7
-25	21.8
-20	26.2
-15	31.0
-10	36.3
-5	42.0
0	48.2
5	54.9
10	62.2
15	70.0
20	78.4
25	87.4
30	97.0
35	107.4
40	118.4
45	130.2
50	142.6
55	156.6
60	170.7
65	185.8
70	201.8
75	218.7
80	236.5
85	255.5
90	275.4
95	296.4
100	318.5
105	341.9
110	366.4
115	392.3
120	419.4
125	448.0
130	477.9
135	509.4
140	542.5
145	578.2
150	613.9

How It Works

A PT chart lists the pressure at which a refrigerant boils or condenses (its saturation point) at each temperature. Wherever liquid and vapour exist together — inside the evaporator and the condenser — the pressure on your gauge tells you the refrigerant's temperature.

Using it on a service call

Superheat = Suction Line Temp − Saturation Temp at Suction Pressure

Subcooling = Saturation Temp at Liquid Pressure − Liquid Line Temp

Read the suction pressure, look up its saturation temperature, and compare it to the actual suction line temperature to get superheat. Do the same on the liquid line for subcooling. The Superheat & Subcooling calculator does both steps for you.

Blends and glide

R-454B and R-404A are zeotropic blends: they boil across a small temperature range instead of at one point. This is called glide — about 2°F (1°C) for R-454B and under 1.5°F for R-404A. Use the dew point (vapour) for superheat and the bubble point (liquid) for subcooling. R-410A's glide is small enough to ignore, and R-32 and R-22 have none.

Gauge vs absolute pressure

All pressures here are gauge pressure (psig or kPa gauge) — what a manifold or digital gauge reads. Like printed PT charts, it assumes sea-level atmospheric pressure; at high elevation a gauge reads slightly higher for the same saturation temperature (about 2.5 psi / 17 kPa at 5,000 ft). Values between published rows are linearly interpolated.