675 on the US EPA basis, the AIM Act exchange value for HFC-32. IPCC AR6 gives 771; US rules use 675.

RefrigerantASHRAE R-32

R32 PT Chart

Q: What is the normal operating pressure of R-32?

Operating pressure depends on evaporator load and ambient; for suction and discharge by outdoor temperature, see [What pressure should R-32 be?](/what-pressure-should-r32/). The saturation pressures are in the PT table and the comparison table on this page.

Q: Is R-32 flammable?

Yes. R-32 is in ASHRAE safety group A2L: lower flammability, with a burning velocity of 10 cm/s or less.

Q: Why is R-32 replacing R-410A?

Its GWP of 675 is under the 700 limit for new residential and light-commercial AC and heat pumps in 40 CFR 84.54; R-410A's 2,088 is not. R-454B (GWP 465), a blend of R-32 and R-1234yf, is also A2L and listed for the same equipment.

Q: What lubricant does R-32 use?

POE. Copeland lists POE-32B and POE-46 for R-32 compressors [copeland9311, R-32 row]. Use the oil the equipment maker specifies.

Q: Can I retrofit an R-410A system to R-32?

No. EPA lists it for new equipment only. R-410A is A1 and R-32 is A2L. Under SNAP Rule 23, EPA lists R-32 for residential and light-commercial AC and heat pumps in new equipment only (not as a retrofit), built to UL 60335-2-40.

Updated October 19, 2026

R-32

A2L Lower toxicity, lower flammabilityHFC (pure) AIM Act HFC

Illustration of a refrigerant cylinder painted light green gray (RAL 7044), the color AHRI Guideline N-2017 calls for on all new refrigerant containers from 2020^{[10], section 4.8}. Label: R-32, safety class A2L, GWP 675. Red band on the shoulder: AHRI Guideline N-2017 calls for one on containers of flammable refrigerants^{[10], section 4.7}.

CH2F2

Pure HFC-32 (difluoromethane)^[5], A2L^[1]. Its GWP (675) is under the 700 limit for new residential and light-commercial AC and heat pumps^[6]^[7].

R-32 saturation pressure is 121.0 PSIG at 40°F, 205.8 PSIG at 70°F, and 325.7 PSIG at 100°F. These are static saturation pressures. The full table below runs from −40°F to 150°F in 1°F steps. For running pressures by outdoor temperature, see R-32 operating pressures.

Checked against the NIST Chemistry WebBook (SRD 69) saturation data for R-32^[11] at 20 points from −29°F to 110°F: largest difference 0.01 psi.

Saturation @ 70°F

205.8 PSIG

GWP (100-yr)

675 AIM Act exchange value (IPCC AR4)

Boiling point

−61.0°F

Sourced facts

ASHRAE safety class: A2L^[1]
Chemical formula: CH₂F₂^[1]
GWP (100-yr): 675^[6]
GWP (AR6): 771^[2]
ODP: 0^[13]
Normal boiling point: −61.0°F (−51.7°C)^[4]
Critical temperature: 172.6°F (78.1°C)^[4]
Lubricant: POE^{[9], R-32 row}

R-32 PT calculator Operating pressures Superheat

R-32 PT chart — printable saturation table

Looking for the R-32 PT chart PDF for shop reference? The complete pressure-temperature saturation table is below: every 1° increment from −40°F to 150°F (or to the refrigerant's critical temperature). Use the Print / Save as PDF button in the table header to download a clean, table-only PDF (the rest of the page is hidden from the print output).

R-32 PT Chart — Pressure-Temperature Saturation Table

Computed with CoolProp 7.2.0 in 1°F steps · hvacptcharts.com

R-32 · 1° increments · °F / PSIG

Tinted rows: 32°F H₂O freeze

R-32 pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	11.0
−39°F	11.7
−38°F	12.4
−37°F	13.0
−36°F	13.7
−35°F	14.4
−34°F	15.2
−33°F	15.9
−32°F	16.6
−31°F	17.4
−30°F	18.2
−29°F	19.0
−28°F	19.8
−27°F	20.6
−26°F	21.5
−25°F	22.3
−24°F	23.2
−23°F	24.1
−22°F	25.0
−21°F	25.9
−20°F	26.8
−19°F	27.8
−18°F	28.7
−17°F	29.7
−16°F	30.7
−15°F	31.7
−14°F	32.8
−13°F	33.8
−12°F	34.9
−11°F	36.0
−10°F	37.1
−9°F	38.2
−8°F	39.4
−7°F	40.5
−6°F	41.7
−5°F	42.9
−4°F	44.2
−3°F	45.4
−2°F	46.7
−1°F	47.9
0°F	49.3
1°F	50.6
2°F	51.9
3°F	53.3
4°F	54.7
5°F	56.1
6°F	57.5
7°F	59.0
8°F	60.5
9°F	62.0
10°F	63.5
11°F	65.0
12°F	66.6
13°F	68.2
14°F	69.8
15°F	71.4
16°F	73.1
17°F	74.8
18°F	76.5
19°F	78.3
20°F	80.0
21°F	81.8
22°F	83.6
23°F	85.5
24°F	87.3
25°F	89.2
26°F	91.1
27°F	93.1
28°F	95.1
29°F	97.1
30°F	99.1
31°F	101.1
32°F H₂O freeze	103.2
33°F	105.3
34°F	107.5
35°F	109.7
36°F	111.9
37°F	114.1
38°F	116.3
39°F	118.6
40°F	121.0
41°F	123.3
42°F	125.7
43°F	128.1
44°F	130.5
45°F	133.0
46°F	135.5
47°F	138.0
48°F	140.6
49°F	143.2
50°F	145.8
51°F	148.5
52°F	151.2
53°F	153.9
54°F	156.7
55°F	159.5
56°F	162.4
57°F	165.2
58°F	168.1
59°F	171.1
60°F	174.0
61°F	177.1
62°F	180.1
63°F	183.2
64°F	186.3
65°F	189.5
66°F	192.7
67°F	195.9
68°F	199.2
69°F	202.5
70°F	205.8
71°F	209.2
72°F	212.6
73°F	216.1
74°F	219.6
75°F	223.2
76°F	226.7
77°F	230.4
78°F	234.0
79°F	237.7
80°F	241.5
81°F	245.3
82°F	249.1
83°F	253.0
84°F	256.9
85°F	260.9
86°F	264.9
87°F	268.9
88°F	273.0
89°F	277.1
90°F	281.3
91°F	285.5
92°F	289.8
93°F	294.1
94°F	298.5
95°F	302.9
96°F	307.4
97°F	311.9
98°F	316.4
99°F	321.0
100°F	325.7
101°F	330.4
102°F	335.1
103°F	339.9
104°F	344.8
105°F	349.6
106°F	354.6
107°F	359.6
108°F	364.6
109°F	369.7
110°F	374.9
111°F	380.1
112°F	385.3
113°F	390.7
114°F	396.0
115°F	401.4
116°F	406.9
117°F	412.4
118°F	418.0
119°F	423.6
120°F	429.3
121°F	435.1
122°F	440.9
123°F	446.8
124°F	452.7
125°F	458.7
126°F	464.7
127°F	470.8
128°F	477.0
129°F	483.2
130°F	489.5
131°F	495.8
132°F	502.2
133°F	508.7
134°F	515.2
135°F	521.8
136°F	528.5
137°F	535.2
138°F	542.0
139°F	548.8
140°F	555.8
141°F	562.8
142°F	569.8
143°F	576.9
144°F	584.1
145°F	591.4
146°F	598.7
147°F	606.2
148°F	613.6
149°F	621.2
150°F	628.8

R-32 pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−40°C	76
−39°C	84
−38°C	93
−37°C	102
−36°C	111
−35°C	120
−34°C	130
−33°C	140
−32°C	150
−31°C	161
−30°C	172
−29°C	184
−28°C	195
−27°C	208
−26°C	220
−25°C	233
−24°C	247
−23°C	260
−22°C	275
−21°C	289
−20°C	304
−19°C	320
−18°C	336
−17°C	352
−16°C	369
−15°C	387
−14°C	405
−13°C	423
−12°C	442
−11°C	461
−10°C	481
−9°C	502
−8°C	523
−7°C	544
−6°C	567
−5°C	589
−4°C	613
−3°C	636
−2°C	661
−1°C	686
0°C H₂O freeze	712
1°C	738
2°C	765
3°C	793
4°C	821
5°C	850
6°C	880
7°C	910
8°C	941
9°C	973
10°C	1,006
11°C	1,039
12°C	1,073
13°C	1,108
14°C	1,143
15°C	1,179
16°C	1,217
17°C	1,255
18°C	1,293
19°C	1,333
20°C	1,373
21°C	1,415
22°C	1,457
23°C	1,500
24°C	1,544
25°C	1,588
26°C	1,634
27°C	1,681
28°C	1,728
29°C	1,777
30°C	1,826
31°C	1,877
32°C	1,928
33°C	1,981
34°C	2,034
35°C	2,089
36°C	2,144
37°C	2,201
38°C	2,258
39°C	2,317
40°C	2,377
41°C	2,438
42°C	2,500
43°C	2,563
44°C	2,628
45°C	2,693
46°C	2,760
47°C	2,828
48°C	2,898
49°C	2,968
50°C	3,040
51°C	3,113
52°C	3,187
53°C	3,263
54°C	3,340
55°C	3,419
56°C	3,498
57°C	3,580
58°C	3,662
59°C	3,746
60°C	3,832
61°C	3,919
62°C	4,008
63°C	4,098
64°C	4,190
65°C	4,283
66°C	4,378

CoolProp 7.2.0 · PSIG/kPa = gauge · PSIA = PSIG + 14.6959 · kPa(abs) = kPa(gauge) + 101.325

Full saturation values at 1° increments. Toggle between °F / PSIG and °C / kPa. Use Print / Save as PDF for laminated shop reference, or download the CSV / JSON below for use in other tools. R-32 PT chart data: CoolProp 7.2.0 (published Helmholtz equations of state / mixture models — see the source citations above).

A2L

Lower toxicity, lower flammability

Lower toxicity. Flame propagates in air at 60°C, but with a low burning velocity (≤ 10 cm/s) and a heat of combustion < 19,000 kJ/kg. ASHRAE safety group A2L: lower toxicity and lower flammability. R-32, R-454B, R-1234yf, R-1234ze(E), R-452B, R-454C, R-455A, R-516A are A2L.

Flammability: Low (burning velocity ≤ 10 cm/s)
Toxicity: Lower (OEL ≥ 400 ppm)

Classification per ANSI/ASHRAE Standard 34-2022^{[1], safety group definitions and refrigerant safety classifications}. See full reference.

Saturation pressure-temperature curve

Pressure

Temperature

Highlight at°F

Quick lookup — R-32

Temp:°F

205.8PSIG(1,419 kPa)

Range: −40 to 150°F Open full PT calculator →

Common service temperatures

32°F

103PSIG

Freezing

45°F

133PSIG

Heat-pump heat

70°F

206PSIG

Standard

75°F

223PSIG

Test ref

80°F

241PSIG

Warm

95°F

303PSIG

Summer peak

Saturation values from CoolProp 7.2.0^[4]. Operating pressure on a running system differs — see what R-32 operating pressures should be.

At a glance

Chemistry

CH2F2

Difluoromethane

Lubricant compatibility

POEMOAB

POE required. A2L (lower flammability)^[1]. Under SNAP Rule 23, EPA lists R-32 for residential and light-commercial AC and heat pumps in new equipment only — not as a retrofit — built to UL 60335-2-40^[8].

Common applications

Residential and light-commercial air conditioning and heat pumps (new equipment)

Properties

Boiling point (1 atm)
−61.0°F (−51.7°C)
Critical point
172.6°F (78.1°C) at 824 PSIG
Molar mass
52.02 g/mol
ODP
0
GWP (100-yr)
675 AIM Act exchange value (IPCC AR4) IPCC: AR4 675 · AR5 677 · AR6 771
Atmospheric lifetime
5.2 years
New-equipment status (US)
Restricted in 20 new-equipment categories — US new-equipment rules (40 CFR 84.54).

What is R-32?

R-32 is pure difluoromethane (CH₂F₂), a single-molecule HFC with no temperature glide and no chlorine^[1]^{[5], R-32}.

Compared with R-410A (A1), R-32 is class A2L (lower flammability)^[1].

Where R-32 is used

Residential central air conditioning (new equipment)^[8]
A component of R-410A (50% by mass) and of blends such as R-454B, R-454C and R-452B^[5].

Service notes

Use the oil the equipment maker specifies.

Operating cycle

Phase-down timeline

R-32 is a regulated substance under the AIM Act^{[3], 42 U.S.C. 7675(c)(1)}. Its GWP under 40 CFR 84.64 is 675, at or above the limit in 20 of the categories 40 CFR 84.54 restricts (listed under “All 84.54 categories restricting R-32”).

R-32 is not restricted in new residential & light-commercial AC and heat pumps (its 84.64 GWP 675 is below that subsector's limit).^{[7], §84.54(a)(1), (c)(1), (c)(2)}

HFC production & consumption allowances step down to 30% of baseline in 2029–2033, 20% of baseline in 2034–2035, and 15% of baseline in 2036 and later (42 U.S.C. 7675(e)(2)(C))^[3].

Full 40 CFR 84.54 new-equipment rules for R-32 →

US new-equipment rules (40 CFR 84.54)

R-32 is a regulated substance under the AIM Act^{[3], 42 U.S.C. 7675(c)(1)}. Under 40 CFR 84.64(a) its GWP is 675, the AIM Act exchange value. That value is compared against each 40 CFR 84.54 subsector limit below.

Its GWP (675) is under every 40 CFR 84.54 limit for residential & light-commercial AC and heat pumps, so those restrictions don't apply there.

Not restricted in new residential & light-commercial AC and heat pumps.

All 84.54 categories restricting R-32 (20)^[7]

Refrigeration, air conditioning & heat pumps (13)
January 1, 2025	Household refrigerators and freezers	GWP ≥ 150	(a)(3)
January 1, 2025	Retail food refrigeration — stand-alone units	GWP ≥ 150	(a)(4)
January 1, 2025	Vending machines	GWP ≥ 150	(a)(5)
January 1, 2026	Industrial process refrigeration products (non-chiller), charge 200 lb or greater, refrigerant entering the evaporator warmer than −22°F (−30°C)	GWP ≥ 150	(a)(12)(i)
January 1, 2026	Industrial process refrigeration products (non-chiller), charge less than 200 lb, refrigerant entering the evaporator warmer than −22°F (−30°C)	GWP ≥ 300	(a)(12)(ii)
January 1, 2026	Ice makers — batch type up to 1,000 lb of ice per 24 h and continuous type up to 1,200 lb per 24 h	GWP ≥ 150	(a)(8)(i)
January 1, 2026	Industrial process refrigeration systems (non-chiller), charge 200 lb or greater, evaporator inlet warmer than −22°F (−30°C), not the high-temperature side of a cascade	GWP ≥ 150	(c)(10)(i)
January 1, 2026	Industrial process refrigeration systems (non-chiller), charge less than 200 lb, evaporator inlet warmer than −22°F (−30°C)	GWP ≥ 300	(c)(10)(ii)
January 1, 2026	Industrial process refrigeration — high-temperature side of cascade systems, evaporator inlet warmer than −22°F (−30°C)	GWP ≥ 300	(c)(10)(iii)
January 1, 2027	Refrigerated food processing and dispensing products outside the scope of UL 621, charge 500 g or less	GWP ≥ 150	(a)(9)(i)
January 1, 2032	Retail food refrigeration — remote condensing units	GWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)	(c)(11)(ii)
January 1, 2032	Supermarket systems	GWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)	(c)(12)(ii)
January 1, 2032	Cold storage warehouse systems	GWP ≥ 150 (200 lb or greater, not the cascade high side); GWP ≥ 300 (less than 200 lb); GWP ≥ 300 (cascade high side)	(c)(9)(ii)
Motor vehicle air conditioning (3)
October 24, 2024	Motor vehicle air-conditioning in Model Year 2025 and later light-duty passenger cars and trucks (gross vehicle weight rating under 8,500 lb)	GWP ≥ 150	(a)(13)(i)
Model Year 2028	Motor vehicle air-conditioning in medium-duty passenger vehicles, heavy-duty pickup trucks and complete heavy-duty vans whose air-conditioning will not be modified by upfitters	GWP ≥ 150	(a)(13)(ii)
January 1, 2028	Motor vehicle air-conditioning in certain nonroad vehicles (agricultural tractors over 40 horsepower; self-propelled agricultural machinery; compact equipment; construction, forestry and mining equipment; and commercial utility vehicles)	GWP ≥ 150	(a)(13)(iii)
Foam blowing agents (2)
January 1, 2025	Foam products: rigid polyurethane appliance foam, commercial refrigeration foam, laminated boardstock, marine flotation foam, sandwich panels, slabstock; flexible polyurethane; integral skin polyurethane; polystyrene (extruded boardstock, billet, extruded sheet); phenolic insulation board and bunstock; polyisocyanurate laminated boardstock; polyolefin; rigid polyurethane spray foam	GWP ≥ 150	(a)(14)
January 1, 2026	Foam products in the (a)(14) formulations for use in space and military applications	GWP ≥ 150	(a)(15)
Aerosol propellants / solvents (2)
January 1, 2025	Aerosol products	GWP ≥ 150	(a)(16)(i)
January 1, 2028	Aerosol products (all, except defense sprays as defined in 84.3)	GWP ≥ 150	(a)(16)(ii)

Servicing. 40 CFR 84.54 restricts new manufacture/import, later sale/distribution, and installation. "Installation" is defined in 84.54(e); repairing or servicing existing R-32 equipment is not an installation unless it meets 84.54(e), so existing systems can keep being serviced. From January 1, 2029, servicing or repairing R-32 equipment in supermarket systems, refrigerated transport or automatic commercial ice makers must be done with reclaimed refrigerant^[12].

Source: 40 CFR 84.54, current through 91 FR 31329 (May 26, 2026). Installation defined at 40 CFR 84.54(e).

Global warming potential, in context

Residential air conditioning

Retrofit and replacement paths

R-32 replaces

R-410A A1 · GWP 2,088

Reading the R-32 pressure-temperature chart

R-32's PT chart is a single curve because R-32 is a pure single-component refrigerant: no blend means no temperature glide and no bubble/dew distinction^[1]. The curve plots saturation pressure on the vertical axis against temperature on the horizontal axis; the line is the phase boundary at thermodynamic equilibrium.

Because R-32 is a single compound, superheat = suction-line temperature − saturation temperature at suction pressure, and subcooling = saturation temperature at liquid-line pressure − liquid-line temperature, with no glide correction.

R-32 vs R-410A, R-454B: saturation pressure

Saturation pressure (PSIG, gauge) for R-32 vs R-410A, R-454B — zeotropic blends shown as dew / bubble. Each column shows the percent difference from R-32. Source: CoolProp 7.2.0 dataset.
Temp	R-32	R-410A	R-454B
0°F	49.3	48.4(−2%)	42.7 / 45.3(−8%)
40°F	121.0	118.8(−2%)	107.0 / 112.0(−7%)
70°F	205.8	201.8(−2%)	183.1 / 190.5(−7%)
100°F	325.7	318.5(−2%)	290.9 / 300.8(−8%)

Frequently asked

›What is the normal operating pressure of R-32?

Operating pressure depends on evaporator load and ambient; for suction and discharge by outdoor temperature, see What pressure should R-32 be?. The saturation pressures are in the PT table and the comparison table on this page.

›Is R-32 flammable?

Yes. R-32 is in ASHRAE safety group A2L: lower flammability, with a burning velocity of 10 cm/s or less^[1].

›What is R-32's GWP?

675 on the US EPA basis, the AIM Act exchange value for HFC-32^[6]^[3]. IPCC AR6 gives 771^[2]; US rules use 675^[6].

›Why is R-32 replacing R-410A?

Its GWP of 675 is under the 700 limit for new residential and light-commercial AC and heat pumps in 40 CFR 84.54; R-410A's 2,088 is not^[6]^[7].

R-454B (GWP 465), a blend of R-32 and R-1234yf, is also A2L and listed for the same equipment^[6]^[1]^[8].

›What lubricant does R-32 use?

POE. Copeland lists POE-32B and POE-46 for R-32 compressors^{[9], R-32 row}. Use the oil the equipment maker specifies.

›Can I retrofit an R-410A system to R-32?

No. EPA lists it for new equipment only^[8]. R-410A is A1 and R-32 is A2L^[1]. Under SNAP Rule 23, EPA lists R-32 for residential and light-commercial AC and heat pumps in new equipment only (not as a retrofit), built to UL 60335-2-40^[8].

Download this dataset

Full PT chart for R-32 · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

[1]
ANSI/ASHRAE Standard 34-2022, Designation and Safety Classification of Refrigerants (free read-only version). ASHRAE. 2022. https://www.ashrae.org/technical-resources/standards-and-guidelines/read-only-versions-of-ashrae-standards (accessed October 2, 2026)
[2]
IPCC AR6 WG1 (2021), Chapter 7, Supplementary Material, Table 7.SM.7. IPCC AR6 Working Group I. 2021. https://www.ipcc.ch/report/ar6/wg1/ (accessed October 2, 2026)
[3]
42 U.S.C. 7675 — American Innovation and Manufacturing Act. US Code (via Cornell LII). current. https://www.law.cornell.edu/uscode/text/42/7675 (accessed October 2, 2026)
[4]
CoolProp 7.2.0. CoolProp (I. H. Bell, J. Wronski, S. Quoilin, V. Lemort). https://coolprop.org/ (accessed October 2, 2026). Bell, I. H.; Wronski, J.; Quoilin, S.; Lemort, V. Pure and Pseudo-pure Fluid Thermophysical Property Evaluation and the Open-Source Thermophysical Property Library CoolProp. Ind. Eng. Chem. Res. 53, 2498–2508 (2014). https://doi.org/10.1021/ie4033999
[5]
ASHRAE Refrigerant Designations. ASHRAE. web page, updated May 25, 2021. https://www.ashrae.org/technical-resources/standards-and-guidelines/ashrae-refrigerant-designations (accessed October 2, 2026)
[6]
Technology Transitions GWP Reference Table. US EPA. updated April 2, 2026. https://www.epa.gov/hfcs/technology-transitions-gwp-reference-table (accessed October 2, 2026)
[7]
40 CFR 84.54 — Restrictions on the use of hydrofluorocarbons. eCFR (Office of the Federal Register). up to date as of 9/29/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84/subpart-B/section-84.54 (accessed October 2, 2026)
[8]
Protection of Stratospheric Ozone: Listing of Substitutes Under the SNAP Program (SNAP Rule 23), 86 FR 24444. US EPA (Federal Register). May 6, 2021; effective June 7, 2021. https://www.federalregister.gov/documents/2021/05/06/2021-08968/protection-of-stratospheric-ozone-listing-of-substitutes-under-the-significant-new-alternatives (accessed October 2, 2026)
[9]
Refrigerants and lubricants approved for use in Copeland compressors. Copeland. Form 93-11 R41 (5/24). https://webapps.copeland.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=93-11 (accessed October 2, 2026)
[10]
2017 Guideline for Assignment of Refrigerant Container Colors (AHRI Guideline N-2017). AHRI. 2017. https://www.ahrinet.org/system/files/2023-06/AHRI_Guideline_N_2017.pdf (accessed October 2, 2026)
[11]
NIST Chemistry WebBook (SRD 69) saturation data for R-32. NIST. https://webbook.nist.gov/cgi/fluid.cgi?TLow=-40&THigh=150&TInc=10&Digits=6&ID=C75105&Action=Load&Type=SatT&TUnit=F&PUnit=psia&DUnit=lbm%2Fft3&HUnit=Btu%2Flbm&WUnit=ft%2Fs&VisUnit=uPa*s&STUnit=lb%2Fin&RefState=DEF (accessed October 2, 2026). NIST reference equation of state for this fluid
[12]
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