R-407C pressure-temperature chart

Gauge pressure at sea level. Liquid (bubble) pressure is the one to use for subcooling and vapor (dew) pressure for superheat. Values marked inHg are vacuum, in inches of mercury.

°F and psig°C and kPa

R-407C saturation pressure by temperature, °F and psig
°F	Liquid (bubble) psig	Vapor (dew) psig
-40	2.7	4.6 inHg
-39	3.2	3.9 inHg
-38	3.7	3.2 inHg
-37	4.1	2.4 inHg
-36	4.6	1.6 inHg
-35	5.1	0.9 inHg
-34	5.6	0.1 inHg
-33	6.1	0.4
-32	6.6	0.8
-31	7.2	1.2
-30	7.7	1.6
-29	8.3	2.1
-28	8.8	2.5
-27	9.4	3.0
-26	10.0	3.5
-25	10.6	3.9
-24	11.2	4.4
-23	11.8	4.9
-22	12.4	5.4
-21	13.1	5.9
-20	13.7	6.5
-19	14.4	7.0
-18	15.1	7.6
-17	15.8	8.1
-16	16.5	8.7
-15	17.2	9.3
-14	17.9	9.9
-13	18.7	10.5
-12	19.4	11.1
-11	20.2	11.7
-10	20.9	12.3
-9	21.7	13.0
-8	22.5	13.7
-7	23.4	14.3
-6	24.2	15.0
-5	25.0	15.7
-4	25.9	16.4
-3	26.8	17.2
-2	27.7	17.9
-1	28.6	18.7
0	29.5	19.4
1	30.4	20.2
2	31.4	21.0
3	32.3	21.8
4	33.3	22.6
5	34.3	23.5
6	35.3	24.3
7	36.4	25.2
8	37.4	26.1
9	38.5	27.0
10	39.5	27.9
11	40.6	28.8
12	41.7	29.8
13	42.9	30.7
14	44.0	31.7
15	45.2	32.7
16	46.3	33.7
17	47.5	34.7
18	48.7	35.7
19	50.0	36.8
20	51.2	37.9
21	52.5	39.0
22	53.8	40.1
23	55.1	41.2
24	56.4	42.3
25	57.7	43.5
26	59.1	44.7
27	60.5	45.9
28	61.9	47.1
29	63.3	48.3
30	64.7	49.6
31	66.2	50.8
32	67.7	52.1
33	69.2	53.4
34	70.7	54.8
35	72.2	56.1
36	73.8	57.5
37	75.4	58.9
38	77.0	60.3
39	78.6	61.7
40	80.2	63.2
41	81.9	64.6
42	83.6	66.1
43	85.3	67.6
44	87.0	69.2
45	88.8	70.7
46	90.6	72.3
47	92.4	73.9
48	94.2	75.5
49	96.0	77.2
50	97.9	78.8
51	99.8	80.5
52	101.7	82.2
53	103.7	84.0
54	105.6	85.7
55	107.6	87.5
56	109.6	89.3
57	111.7	91.2
58	113.7	93.0
59	115.8	94.9
60	117.9	96.8
61	120.1	98.7
62	122.2	100.7
63	124.4	102.7
64	126.7	104.7
65	128.9	106.7
66	131.2	108.8
67	133.5	110.9
68	135.8	113.0
69	138.1	115.1
70	140.5	117.3
71	142.9	119.5
72	145.4	121.7
73	147.8	124.0
74	150.3	126.2
75	152.8	128.5
76	155.4	130.9
77	157.9	133.2
78	160.5	135.6
79	163.2	138.0
80	165.8	140.5
81	168.5	143.0
82	171.2	145.5
83	174.0	148.0
84	176.8	150.6
85	179.6	153.2
86	182.4	155.8
87	185.3	158.5
88	188.2	161.2
89	191.1	163.9
90	194.1	166.7
91	197.1	169.5
92	200.1	172.3
93	203.2	175.2
94	206.2	178.1
95	209.4	181.0
96	212.5	183.9
97	215.7	186.9
98	218.9	189.9
99	222.2	193.0
100	225.5	196.1
101	228.8	199.2
102	232.1	202.4
103	235.5	205.6
104	239.0	208.8
105	242.4	212.1
106	245.9	215.4
107	249.4	218.8
108	253.0	222.1
109	256.6	225.6
110	260.2	229.0
111	263.9	232.5
112	267.6	236.1
113	271.3	239.6
114	275.1	243.2
115	278.9	246.9
116	282.8	250.6
117	286.7	254.3
118	290.6	258.1
119	294.6	261.9
120	298.6	265.8
121	302.6	269.6
122	306.7	273.6
123	310.8	277.6
124	315.0	281.6
125	319.2	285.6
126	323.4	289.8
127	327.7	293.9
128	332.0	298.1
129	336.3	302.3
130	340.7	306.6
131	345.2	311.0
132	349.7	315.3
133	354.2	319.8
134	358.7	324.2
135	363.3	328.7
136	368.0	333.3
137	372.7	337.9
138	377.4	342.6
139	382.2	347.3
140	387.0	352.0
141	391.8	356.9
142	396.7	361.7
143	401.7	366.6
144	406.7	371.6
145	411.7	376.6
146	416.8	381.7
147	421.9	386.8
148	427.1	392.0
149	432.3	397.2
150	437.5	402.5

R-407C saturation pressure by temperature, °C and kPa
°C	Liquid (bubble) kPa	Vapor (dew) kPa
-40	19	-16
-39	25	-11
-38	30	-7
-37	37	-2
-36	43	3
-35	49	8
-34	56	14
-33	63	19
-32	71	25
-31	78	31
-30	86	37
-29	94	44
-28	102	51
-27	111	58
-26	119	65
-25	129	72
-24	138	80
-23	148	88
-22	158	96
-21	168	105
-20	179	113
-19	190	122
-18	201	132
-17	212	142
-16	224	152
-15	237	162
-14	249	173
-13	262	184
-12	276	195
-11	289	206
-10	303	218
-9	318	231
-8	333	244
-7	348	257
-6	364	270
-5	380	284
-4	396	298
-3	413	313
-2	431	328
-1	448	343
0	467	359
1	485	376
2	504	393
3	524	410
4	544	427
5	565	446
6	586	464
7	607	483
8	629	503
9	652	523
10	675	544
11	699	565
12	723	586
13	748	608
14	773	631
15	799	654
16	825	678
17	852	702
18	879	727
19	908	753
20	936	779
21	966	806
22	995	833
23	1,026	861
24	1,057	889
25	1,089	919
26	1,121	948
27	1,154	979
28	1,188	1,010
29	1,223	1,042
30	1,258	1,074
31	1,293	1,108
32	1,330	1,142
33	1,367	1,176
34	1,405	1,212
35	1,444	1,248
36	1,483	1,285
37	1,523	1,322
38	1,564	1,361
39	1,605	1,400
40	1,648	1,440
41	1,691	1,481
42	1,734	1,522
43	1,779	1,565
44	1,825	1,608
45	1,871	1,652
46	1,918	1,697
47	1,966	1,743
48	2,015	1,790
49	2,064	1,838
50	2,115	1,886
51	2,166	1,936
52	2,218	1,986
53	2,271	2,038
54	2,325	2,090
55	2,380	2,144
56	2,436	2,199
57	2,492	2,254
58	2,550	2,311
59	2,609	2,368
60	2,668	2,427
61	2,729	2,487
62	2,790	2,548
63	2,853	2,610
64	2,916	2,674
65	2,981	2,739

You're free to reuse this chart's numbers under CC BY 4.0. Just credit Pocket HVAC and link back to this page.

From pockethvac.com/r407c-pt-chart/. Each row is solved at its exact temperature with CoolProp 8.0.0. Free to reuse under CC BY 4.0.

What is an R-407C PT chart?

An R-407C PT chart lists the pressure R-407C boils and condenses at for each temperature. At 40°F that's 63.2 psig on the vapor (dew) side and 80.2 psig on the liquid (bubble) side, 17 psi apart, because R-407C has around 10°F of glide. It's sold as Freon 407C, Forane 407C, Genetron 407C and Klea 407C.

Anywhere liquid and vapor are together in a system, like inside the evaporator and condenser coils, the pressure and temperature are locked together, so one tells you the other. On the job, the chart turns gauge readings into saturation temperatures: the suction pressure gives the temperature the evaporator is boiling at, and the liquid line pressure gives the temperature the condenser is condensing at. Compare those with your line temperatures and you have superheat and subcooling.

R-407C is a blend of R-32, R-125 and R-134a (safety class A1) that was developed to replace R-22 in air conditioning, and it runs at similar pressures. Its large glide is why its liquid and vapor columns sit so far apart.

How it's calculated

Absolute pressure = gauge pressure + 14.696 psi (101.325 kPa, one standard atmosphere)
Saturation data: R-407C: CoolProp 8.0.0, R407C
Between table points (every 0.5 °C): ln(pressure) is interpolated linearly in 1 ÷ absolute temperature
Blends have separate liquid (bubble) and vapor (dew) curves
Glide = dew temperature − bubble temperature at the same pressure
Printed chart rows are solved by CoolProp at each exact temperature

Sources

If a number doesn't match your chart, email me what you entered and what you expected, and I'll check it against the source. You can also read how the numbers are checked.

Checked by Paul Williams · Updated October 31, 2026

Questions

What is the R-407C pressure at 40°F?

At 40°F, R-407C saturates at 63.2 psig on the vapor (dew) side and 80.2 psig on the liquid (bubble) side. At 100°F it's 196.1 psig vapor and 225.5 psig liquid.

Why are the liquid and vapor pressures so far apart?

R-407C is a blend of R-32, R-125 and R-134a (23/25/52 by weight) with a lot of glide: about 11°F at evaporator pressures and about 9°F at condenser pressures. At one pressure it starts boiling at the bubble point and finishes at the dew point, several degrees warmer.

Which column do I use for superheat and subcooling?

Vapor (dew) for superheat and liquid (bubble) for subcooling. With R-407C, reading the wrong column throws the answer off by about 9 to 11°F.

How accurate is this chart?

It comes from NIST's equation of state for R-407C (Lemmon, 2003) through CoolProp. It matches Arkema's Forane 407C chart, which uses NIST REFPROP, to its printed 0.1 psi.

R-407C PT Chart