R-454B PT chart

R-454B reads 107.0 psig dew and 112.1 psig bubble at 40°F, and 300.8 psig bubble at 100°F.

R-454B lookup

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Blends: liquid (bubble) pressure is for subcooling; vapor (dew) pressure is for superheat.

R-454B at a glance

Safety group: A2L
Type: HFC/HFO blend, low glide
Composition: R-32 / R-1234yf, 68.9 / 31.1 % by weight
GWP (100-yr): 465 (AR4) · 467 (AR5)
Lubricant: POE
Boiling point: -58.9°F bubble, -57.1°F dew (1 atm)
Glide: about 2.4°F at 40°F
Critical temperature: 173.5°F
Used in: Residential and light commercial air conditioning (splits, mini-splits, PTACs); Heat pumps; DX chillers
Replaces: R-410A
Also sold as: Opteon XL41, Solstice 454B, Puron Advance

EPA lists R-454B as acceptable, subject to use conditions, for new residential and light commercial AC and heat pumps under its SNAP program (May 2021). Its GWP is under the 700 limit that EPA's Technology Transitions rule applies to that equipment from January 1, 2025, and Chemours positions it as a replacement for R-410A in new equipment.

R-454B pressure-temperature table

Every 5°F shown. Liquid = bubble point (use for subcooling); vapor = dew point (use for superheat). ″ Hg = inches of mercury vacuum. * = interpolated.

R-454B saturation pressure, psig at sea level
°F	°C	Liquid psig	Vapor psig
-40	-40.0	9.5	8.4
-39	-39.4	10.2	9.0
-38	-38.9	10.8	9.6
-37	-38.3	11.4	10.2
-36	-37.8	12.1	10.8
-35	-37.2	12.7	11.5
-34	-36.7	13.4	12.1
-33	-36.1	14.1	12.8
-32	-35.6	14.8	13.4
-31	-35.0	15.5	14.1
-30	-34.4	16.3	14.8
-29	-33.9	17.0	15.5
-28	-33.3	17.8	16.3
-27	-32.8	18.5	17.0
-26	-32.2	19.3	17.8
-25	-31.7	20.1	18.5
-24	-31.1	20.9	19.3
-23	-30.6	21.8	20.1
-22	-30.0	22.6	20.9
-21	-29.4	23.5	21.7
-20	-28.9	24.3	22.6
-19	-28.3	25.2	23.4
-18	-27.8	26.1	24.3
-17	-27.2	27.1	25.2
-16	-26.7	28.0	26.1
-15	-26.1	28.9	27.0
-14	-25.6	29.9	27.9
-13	-25.0	30.9	28.9
-12	-24.4	31.9	29.8
-11	-23.9	32.9	30.8
-10	-23.3	34.0	31.8
-9	-22.8	35.0	32.8
-8	-22.2	36.1	33.9
-7	-21.7	37.2	34.9
-6	-21.1	38.3	36.0
-5	-20.6	39.4	37.0
-4	-20.0	40.5	38.1
-3	-19.4	41.7	39.3
-2	-18.9	42.9	40.4
-1	-18.3	44.1	41.5
0	-17.8	45.3	42.7
1	-17.2	46.5	43.9
2	-16.7	47.8	45.1
3	-16.1	49.1	46.3
4	-15.6	50.4	47.6
5	-15.0	51.7	48.9
6	-14.4	53.0	50.1
7	-13.9	54.4	51.4
8	-13.3	55.8	52.8
9	-12.8	57.2	54.1
10	-12.2	58.6	55.5
11	-11.7	60.0	56.9
12	-11.1	61.5	58.3
13	-10.6	63.0	59.7
14	-10.0	64.5	61.1
15	-9.4	66.0	62.6
16	-8.9	67.6	64.1
17	-8.3	69.2	65.6
18	-7.8	70.8	67.2
19	-7.2	72.4	68.7
20	-6.7	74.0	70.3
21	-6.1	75.7	71.9
22	-5.6	77.4	73.5
23	-5.0	79.1	75.2
24	-4.4	80.8	76.9
25	-3.9	82.6	78.6
26	-3.3	84.4	80.3
27	-2.8	86.2	82.0
28	-2.2	88.0	83.8
29	-1.7	89.9	85.6
30	-1.1	91.8	87.4
31	-0.6	93.7	89.3
32	0.0	95.6	91.1
33	0.6	97.6	93.0
34	1.1	99.6	94.9
35	1.7	101.6	96.9
36	2.2	103.6	98.8
37	2.8	105.7	100.8
38	3.3	107.8	102.9
39	3.9	109.9	104.9
40	4.4	112.1	107.0
41	5.0	114.2	109.1
42	5.6	116.5	111.2
43	6.1	118.7	113.4
44	6.7	121.0	115.6
45	7.2	123.2	117.8
46	7.8	125.6	120.0
47	8.3	127.9	122.3
48	8.9	130.3	124.6
49	9.4	132.7	126.9
50	10.0	135.2	129.3
51	10.6	137.6	131.7
52	11.1	140.1	134.1
53	11.7	142.7	136.6
54	12.2	145.2	139.0
55	12.8	147.8	141.5
56	13.3	150.4	144.1
57	13.9	153.1	146.7
58	14.4	155.8	149.3
59	15.0	158.5	151.9
60	15.6	161.3	154.6
61	16.1	164.0	157.3
62	16.7	166.8	160.0
63	17.2	169.7	162.8
64	17.8	172.6	165.6
65	18.3	175.5	168.4
66	18.9	178.5	171.2
67	19.4	181.4	174.1
68	20.0	184.5	177.1
69	20.6	187.5	180.0
70	21.1	190.6	183.0
71	21.7	193.7	186.1
72	22.2	196.9	189.1
73	22.8	200.1	192.2
74	23.3	203.3	195.4
75	23.9	206.6	198.6
76	24.4	209.9	201.8
77	25.0	213.2	205.0
78	25.6	216.6	208.3
79	26.1	220.0	211.6
80	26.7	223.5	215.0
81	27.2	227.0	218.4
82	27.8	230.5	221.8
83	28.3	234.1	225.3
84	28.9	237.7	228.8
85	29.4	241.3	232.3
86	30.0	245.0	235.9
87	30.6	248.7	239.6
88	31.1	252.5	243.2
89	31.7	256.3	246.9
90	32.2	260.1	250.7
91	32.8	264.0	254.5
92	33.3	267.9	258.3
93	33.9	271.9	262.2
94	34.4	275.9	266.1
95	35.0	280.0	270.0
96	35.6	284.1	274.0
97	36.1	288.2	278.1
98	36.7	292.4	282.2
99	37.2	296.6	286.3
100	37.8	300.8	290.4
101	38.3	305.1	294.7
102	38.9	309.5	298.9
103	39.4	313.9	303.2
104	40.0	318.3	307.6
105	40.6	322.8	312.0
106	41.1	327.3	316.4
107	41.7	331.9	320.9
108	42.2	336.5	325.4
109	42.8	341.2	330.0
110	43.3	345.9	334.6
111	43.9	350.6	339.3
112	44.4	355.4	344.0
113	45.0	360.3	348.8
114	45.6	365.2	353.6
115	46.1	370.1	358.4
116	46.7	375.1	363.4
117	47.2	380.1	368.3
118	47.8	385.2	373.4
119	48.3	390.4	378.4
120	48.9	395.6	383.5
121	49.4	400.8	388.7
122	50.0	406.1	393.9
123	50.6	411.4	399.2
124	51.1	416.8	404.5
125	51.7	422.3	409.9
126	52.2	427.8	415.3
127	52.8	433.3	420.8
128	53.3	438.9	426.4
129	53.9	444.6	432.0
130	54.4	450.3	437.6
131	55.0	456.0	443.4
132	55.6	461.8	449.1
133*	56.1	467.7	454.9
134*	56.7	473.6	460.8
135*	57.2	479.6	466.8
136*	57.8	485.6	472.8
137*	58.3	491.7	478.9
138	58.9	497.8	485.0
139	59.4	504.0	491.2
140	60.0	510.3	497.4
141	60.6	516.6	503.7
142	61.1	523.0	510.1
143	61.7	529.4	516.5
144*	62.2	535.9	523.1
145*	62.8	542.5	529.6
146*	63.3	549.1	536.3
147*	63.9	555.8	543.0
148	64.4	562.5	549.8
149	65.0	569.3	556.6
150	65.6	576.1	563.5
151*	66.1	583.0	570.5
152	66.7	590.0	577.6
153	67.2	597.1	584.7
154	67.8	604.2	591.9
155	68.3	611.4	599.2
156	68.9	618.6	606.6
157	69.4	625.9	614.0
158	70.0	633.3	621.6
159	70.6	640.7	629.2

Saturation pressures computed with CoolProp 8.0.0 (R454B.mix) on October 10, 2026, gauge pressure at sea level. Checked against Chemours published chart at 16 points; largest difference 0.80 psi. How these numbers are made.

What R-454B is and where it is used

R-454B is a blend of R-32 and the HFO R-1234yf, 68.9/31.1 by weight. Chemours sells it as Opteon XL41, Honeywell's PT chart lists it as Solstice 454B, and Carrier markets it as Puron Advance. Chemours positions it as a direct replacement for R-410A in new equipment only: window units, portables, ducted splits, mini-splits, multi-splits, PTACs, heat pumps and DX chillers. Its GWP is 465 (AR4, as listed by EPA), which Chemours puts at 78% below R-410A.

R-454B is ASHRAE safety group A2L: lower toxicity and lower flammability. Chemours notes that the latest UL 60335-2-40 equipment standard and ASHRAE 15, which covers field applications, have completed their evaluation of A2L refrigerants, and it says to check local regulations and standards such as UL, IEC or ASHRAE for the allowable system charge and safe handling requirements. Carrier says its Puron Advance products include a sensor that monitors for leaks and starts a fan to dissipate refrigerant if one is found. Follow the installation manual for charge limits and line sets, and read what A2L refrigerants change for techs before a first install.

How to read the R-454B chart

Chemours describes the glide of R-454B as very low, but it is a blend, so each temperature has two pressures. At 110 psig the dew point is 41.4°F and the bubble point is 39.0°F. Chemours' A/C guide uses the saturated vapor value for superheat and the saturated liquid value for subcooling.

Superheat: convert suction pressure with the dew column. A 107 psig suction reading is 40.0°F. Subtract it from the suction line temperature.
Subcooling: convert liquid line pressure with the bubble column. At 375 psig the bubble point is 116.0°F. Subtract the liquid line temperature from it.

Honeywell's Solstice 454B chart is laid out pressure-first: each gauge pressure lists an average, a bubble and a dew temperature. Chemours' Opteon XL41 data gives both a pressure-first and a temperature-first table. When charging a unit, follow the equipment manufacturer's chart or charging table.

The superheat calculator and subcooling calculator pick the right column. See bubble point, dew point and glide for why blends have two.

Example R-454B pressures on an air conditioner

The figures below are worked examples at assumed coil temperatures, not targets for any unit:

Suction: at a 40°F evaporator dew point, R-454B reads about 107.0 psig, a little below R-410A at 118.4 psig.
Head: at 115°F and 125°F condensing (bubble) temperatures, R-454B reads 370.1 psig and 422.3 psig. R-410A would read 392.3 psig and 448.0 psig.

At a 45°F evaporator and a 115°F condenser, Chemours rates R-454B at 97% of R-410A's capacity and 102% of its COP, with 82% of its mass flow. Charge to the method and values in the unit's installation manual, not to a pressure.

Service notes

New equipment only: Chemours states that A2L refrigerants can only be used in new equipment and are not to be used as retrofit refrigerants, and that its Opteon XL refrigerants were developed for new equipment design only. Do not put R-454B in an R-410A system, and do not mix refrigerants.
Charging: Chemours says to remove refrigerant blends from the cylinder as liquid. It also says the very low glide of R-454B means it can be topped off after leaks.
Oil: Chemours lists R-454B as miscible with POE lubricant.
Tools: for its Opteon XL refrigerants, Chemours lists 2L-certified recovery machines, leak detectors and gas detectors, recovery cylinders labeled flammable with left-hand threads, and a vacuum pump with its switch away from the work zone. It lists gauge manifolds, charging hoses and scales as routine, the same as for R-410A.

R-454B, R-410A and R-32

R-454B and R-32 are both A2L refrigerants that EPA lists under SNAP for new residential and light commercial AC and heat pumps, and both have GWPs under 700. At 40°F, R-410A dew reads 118.4 psig, R-454B dew reads 107.0 psig and R-32 reads 121.0 psig. Chemours says not to mix refrigerants, so charge only the refrigerant on the unit's nameplate. Compare them in R-410A vs R-454B and R-454B vs R-32.

Last reviewed October 10, 2026.