R-449A pressure-temperature chart

Gauge pressure at sea level. Liquid (bubble) pressure is the one to use for subcooling and vapor (dew) pressure for superheat.

°F and psig°C and kPa

R-449A saturation pressure by temperature, °F and psig
°F	Liquid (bubble) psig	Vapor (dew) psig
-40	4.5	0.0
-39	5.0	0.4
-38	5.5	0.8
-37	6.0	1.2
-36	6.6	1.7
-35	7.1	2.1
-34	7.6	2.6
-33	8.2	3.0
-32	8.8	3.5
-31	9.3	4.0
-30	9.9	4.4
-29	10.5	4.9
-28	11.1	5.4
-27	11.8	6.0
-26	12.4	6.5
-25	13.0	7.0
-24	13.7	7.6
-23	14.4	8.1
-22	15.0	8.7
-21	15.7	9.3
-20	16.4	9.9
-19	17.2	10.5
-18	17.9	11.1
-17	18.6	11.7
-16	19.4	12.3
-15	20.1	13.0
-14	20.9	13.7
-13	21.7	14.3
-12	22.5	15.0
-11	23.4	15.7
-10	24.2	16.4
-9	25.0	17.1
-8	25.9	17.9
-7	26.8	18.6
-6	27.7	19.4
-5	28.6	20.2
-4	29.5	21.0
-3	30.5	21.8
-2	31.4	22.6
-1	32.4	23.4
0	33.4	24.3
1	34.4	25.1
2	35.4	26.0
3	36.4	26.9
4	37.5	27.8
5	38.5	28.7
6	39.6	29.7
7	40.7	30.6
8	41.8	31.6
9	42.9	32.6
10	44.1	33.6
11	45.3	34.6
12	46.4	35.6
13	47.6	36.6
14	48.9	37.7
15	50.1	38.8
16	51.4	39.9
17	52.6	41.0
18	53.9	42.1
19	55.2	43.3
20	56.6	44.5
21	57.9	45.6
22	59.3	46.8
23	60.7	48.1
24	62.1	49.3
25	63.5	50.6
26	64.9	51.8
27	66.4	53.1
28	67.9	54.5
29	69.4	55.8
30	70.9	57.1
31	72.5	58.5
32	74.0	59.9
33	75.6	61.3
34	77.2	62.8
35	78.9	64.2
36	80.5	65.7
37	82.2	67.2
38	83.9	68.7
39	85.6	70.3
40	87.4	71.8
41	89.1	73.4
42	90.9	75.0
43	92.7	76.6
44	94.6	78.3
45	96.4	80.0
46	98.3	81.7
47	100.2	83.4
48	102.1	85.1
49	104.1	86.9
50	106.1	88.7
51	108.1	90.5
52	110.1	92.3
53	112.1	94.2
54	114.2	96.1
55	116.3	98.0
56	118.4	99.9
57	120.6	101.9
58	122.8	103.8
59	125.0	105.9
60	127.2	107.9
61	129.5	109.9
62	131.7	112.0
63	134.1	114.1
64	136.4	116.3
65	138.8	118.5
66	141.1	120.6
67	143.6	122.9
68	146.0	125.1
69	148.5	127.4
70	151.0	129.7
71	153.5	132.0
72	156.1	134.4
73	158.7	136.8
74	161.3	139.2
75	163.9	141.7
76	166.6	144.1
77	169.3	146.6
78	172.0	149.2
79	174.8	151.7
80	177.6	154.3
81	180.4	157.0
82	183.3	159.6
83	186.1	162.3
84	189.0	165.0
85	192.0	167.8
86	195.0	170.6
87	198.0	173.4
88	201.0	176.2
89	204.1	179.1
90	207.2	182.0
91	210.3	185.0
92	213.5	188.0
93	216.7	191.0
94	219.9	194.0
95	223.2	197.1
96	226.5	200.2
97	229.8	203.4
98	233.2	206.6
99	236.6	209.8
100	240.1	213.1
101	243.5	216.4
102	247.0	219.7
103	250.6	223.1
104	254.2	226.5
105	257.8	229.9
106	261.4	233.4
107	265.1	236.9
108	268.8	240.5
109	272.6	244.1
110	276.4	247.7
111	280.2	251.4
112	284.1	255.1
113	288.0	258.9
114	291.9	262.7
115	295.9	266.5
116	299.9	270.4
117	303.9	274.3
118	308.0	278.2
119	312.2	282.2
120	316.3	286.3
121	320.6	290.4
122	324.8	294.5
123	329.1	298.7
124	333.4	302.9
125	337.8	307.2
126	342.2	311.5
127	346.6	315.8
128	351.1	320.2
129	355.7	324.7
130	360.2	329.2
131	364.8	333.7
132	369.5	338.3
133	374.2	342.9
134	378.9	347.6
135	383.7	352.4
136	388.5	357.1
137	393.4	362.0
138	398.3	366.9
139	403.3	371.8
140	408.3	376.8
141	413.3	381.8
142	418.4	386.9
143	423.5	392.1
144	428.7	397.3
145	433.9	402.5
146	439.2	407.9
147	444.5	413.2
148	449.9	418.7
149	455.3	424.1
150	460.7	429.7

R-449A saturation pressure by temperature, °C and kPa
°C	Liquid (bubble) kPa	Vapor (dew) kPa
-40	31	0
-39	37	5
-38	44	10
-37	50	16
-36	57	21
-35	64	27
-34	72	33
-33	79	40
-32	87	46
-31	95	53
-30	104	60
-29	112	67
-28	121	75
-27	130	82
-26	140	90
-25	150	99
-24	160	107
-23	170	116
-22	181	125
-21	192	135
-20	203	145
-19	215	155
-18	227	165
-17	240	176
-16	252	187
-15	266	198
-14	279	210
-13	293	222
-12	307	234
-11	322	247
-10	337	260
-9	352	273
-8	368	287
-7	384	302
-6	401	316
-5	418	331
-4	436	347
-3	454	363
-2	472	379
-1	491	396
0	511	413
1	530	431
2	551	449
3	572	467
4	593	487
5	615	506
6	637	526
7	660	547
8	683	568
9	707	589
10	731	611
11	756	634
12	782	657
13	808	681
14	835	705
15	862	730
16	890	755
17	918	781
18	947	808
19	976	835
20	1,007	863
21	1,037	891
22	1,069	920
23	1,101	950
24	1,134	980
25	1,167	1,011
26	1,201	1,043
27	1,236	1,075
28	1,271	1,108
29	1,307	1,142
30	1,344	1,176
31	1,382	1,211
32	1,420	1,247
33	1,459	1,284
34	1,499	1,321
35	1,539	1,359
36	1,580	1,398
37	1,622	1,438
38	1,665	1,478
39	1,708	1,519
40	1,752	1,561
41	1,797	1,604
42	1,843	1,648
43	1,890	1,693
44	1,937	1,738
45	1,985	1,785
46	2,034	1,832
47	2,084	1,880
48	2,135	1,929
49	2,187	1,980
50	2,239	2,031
51	2,293	2,083
52	2,347	2,136
53	2,402	2,190
54	2,459	2,245
55	2,516	2,301
56	2,573	2,358
57	2,632	2,416
58	2,692	2,476
59	2,753	2,536
60	2,815	2,598
61	2,878	2,661
62	2,942	2,725
63	3,006	2,790
64	3,072	2,857
65	3,139	2,924

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/r449a-pt-chart/. Every °F row is from Chemours' Opteon XP40 tables, and the °C rows are filled in from them. Free to reuse under CC BY 4.0.

What is an R-449A PT chart?

An R-449A PT chart lists the pressure R-449A boils and condenses at for each temperature. At 40°F that's 71.8 psig on the vapor (dew) side and 87.4 psig on the liquid (bubble) side, about 16 psi apart, because R-449A has about 9°F of glide. It's sold as Opteon XP40 and Forane 449A.

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-449A is a blend of R-32, R-125, R-1234yf and R-134a (safety class A1) made to replace R-404A, R-507A, R-22 and the R-407 blends in low and medium temperature refrigeration, in new equipment and as a retrofit. Its global warming potential (GWP) is about 1,400.

How it's calculated

Absolute pressure = gauge pressure + 14.696 psi (101.325 kPa, one standard atmosphere)
Saturation data: R-449A: Chemours, Thermodynamic Properties of Opteon XP40 (R-449A), engineering units, C-10319 (8/23) (NIST REFPROP 10), every 1 °F from -40 to 175 °F
Between the published table's rows: ln(pressure) follows a cubic spline (not-a-knot) in 1 ÷ absolute temperature, through every printed row
Between table points (every 0.5 °F): 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 °F rows are the published table's own; °C rows come from the spline

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-449A pressure at 40°F?

At 40°F, R-449A saturates at 71.8 psig on the vapor (dew) side and 87.4 psig on the liquid (bubble) side. At 100°F it's 213.1 psig vapor and 240.1 psig liquid.

Which column do I use for superheat and subcooling?

Vapor (dew) for superheat and liquid (bubble) for subcooling. R-449A is a blend of R-32, R-125, R-1234yf and R-134a (24.3/24.7/25.3/25.7 by weight) with about 9 to 10°F of glide at evaporator pressures and about 8°F at condenser pressures, so reading the wrong column throws the answer off by that much.

Is R-449A the same as R-448A?

No, but they're close. Both are A1 blends made to replace R-404A, and their vapor (dew) pressures are within half a psi of each other: 71.8 against 72.1 psig at 40°F. The liquid side runs a little lower on R-449A, 87.4 psig against 89.0. Use the chart for the refrigerant that's in the system.

How accurate is this chart?

Every °F row is Chemours' own number, from its Opteon XP40 property tables (NIST REFPROP 10), and the °C rows are filled in along a smooth curve through them. It matches Arkema's Forane chart, also from REFPROP 10, to its printed 0.1 psi on every row from -40 to 150°F.

R-449A PT Chart