RefrigerantASHRAE R-22

R22 PT Chart

Q: Why is R-22 being phased out?

R-22 contains chlorine, and its ODP is 0.055. R-22 is an HCFC; the Montreal Protocol's 1992 Copenhagen Amendment brought HCFCs under control. The US implemented this through the EPA class II ozone phaseout (40 CFR Part 82 Subpart A): from January 1, 2010, no production or import of R-22 except for use in equipment manufactured before that date; from January 1, 2020, no production or import.

Updated October 19, 2026

R-22

A1 Lower toxicity, no flame propagationHCFC ODS — HCFC Production/import ended · 2020

since 2020

Before 2020, AHRI Guideline N assigned R-22 containers the color light green (PMS 352)^{[17], Table 1}. 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^{[17], section 4.8}. Label: R-22, safety class A1, GWP 1,810. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants^{[17], section 4.7}.

CHClF2

Pure HCFC-22 (chlorodifluoromethane)^[5]. US production and import ended on January 1, 2020; existing systems can still be serviced with reclaimed or pre-2020 R-22^[7]^[8].

R-22 saturation pressure is 68.6 PSIG at 40°F, 121.4 PSIG at 70°F, and 195.9 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-22 operating pressures.

Checked against the NIST Chemistry WebBook (SRD 69) saturation data for R-22^[18] at 19 points from −39°F to 136°F: largest difference 0.01 psi.

Saturation @ 70°F

121.4 PSIG

GWP (100-yr)

1,810 IPCC AR4

Boiling point

−41.5°F

Sourced facts

ASHRAE safety class: A1^[1]
Chemical formula: CHClF₂^[1]
ODP: 0.055^[6]
GWP (100-yr): 1,810^{[19], Table 2.14}
Normal boiling point: −41.5°F (−40.8°C)^[2]
Critical temperature: 205.1°F (96.1°C)^[2]
US production and import: Ended January 1, 2020^[7]
Lubricant: Mineral oil or alkylbenzene^{[3], R-22 row}

R-22 PT calculator Operating pressures Superheat

R-22 PT chart — printable saturation table

Looking for the R-22 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-22 PT Chart — Pressure-Temperature Saturation Table

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

R-22 · 1° increments · °F / PSIG

Tinted rows: 32°F H₂O freeze

R-22 pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)	Pressure (PSIG)
−40°F	0.6
−39°F	1.0
−38°F	1.4
−37°F	1.8
−36°F	2.2
−35°F	2.6
−34°F	3.1
−33°F	3.5
−32°F	4.0
−31°F	4.5
−30°F	4.9
−29°F	5.4
−28°F	5.9
−27°F	6.4
−26°F	6.9
−25°F	7.4
−24°F	8.0
−23°F	8.5
−22°F	9.1
−21°F	9.6
−20°F	10.2
−19°F	10.8
−18°F	11.4
−17°F	12.0
−16°F	12.6
−15°F	13.2
−14°F	13.9
−13°F	14.5
−12°F	15.2
−11°F	15.9
−10°F	16.5
−9°F	17.2
−8°F	17.9
−7°F	18.7
−6°F	19.4
−5°F	20.1
−4°F	20.9
−3°F	21.7
−2°F	22.4
−1°F	23.2
0°F	24.0
1°F	24.9
2°F	25.7
3°F	26.5
4°F	27.4
5°F	28.3
6°F	29.2
7°F	30.1
8°F	31.0
9°F	31.9
10°F	32.8
11°F	33.8
12°F	34.8
13°F	35.8
14°F	36.8
15°F	37.8
16°F	38.8
17°F	39.9
18°F	40.9
19°F	42.0
20°F	43.1
21°F	44.2
22°F	45.3
23°F	46.5
24°F	47.6
25°F	48.8
26°F	50.0
27°F	51.2
28°F	52.4
29°F	53.7
30°F	55.0
31°F	56.2
32°F H₂O freeze	57.5
33°F	58.8
34°F	60.2
35°F	61.5
36°F	62.9
37°F	64.3
38°F	65.7
39°F	67.1
40°F	68.6
41°F	70.0
42°F	71.5
43°F	73.0
44°F	74.5
45°F	76.1
46°F	77.6
47°F	79.2
48°F	80.8
49°F	82.4
50°F	84.1
51°F	85.7
52°F	87.4
53°F	89.1
54°F	90.8
55°F	92.6
56°F	94.4
57°F	96.1
58°F	98.0
59°F	99.8
60°F	101.6
61°F	103.5
62°F	105.4
63°F	107.3
64°F	109.3
65°F	111.2
66°F	113.2
67°F	115.3
68°F	117.3
69°F	119.4
70°F	121.4
71°F	123.5
72°F	125.7
73°F	127.8
74°F	130.0
75°F	132.2
76°F	134.5
77°F	136.7
78°F	139.0
79°F	141.3
80°F	143.6
81°F	146.0
82°F	148.4
83°F	150.8
84°F	153.2
85°F	155.7
86°F	158.2
87°F	160.7
88°F	163.2
89°F	165.8
90°F	168.4
91°F	171.0
92°F	173.7
93°F	176.4
94°F	179.1
95°F	181.8
96°F	184.6
97°F	187.4
98°F	190.2
99°F	193.0
100°F	195.9
101°F	198.8
102°F	201.8
103°F	204.7
104°F	207.7
105°F	210.8
106°F	213.8
107°F	216.9
108°F	220.0
109°F	223.2
110°F	226.4
111°F	229.6
112°F	232.8
113°F	236.1
114°F	239.4
115°F	242.8
116°F	246.1
117°F	249.5
118°F	253.0
119°F	256.4
120°F	260.0
121°F	263.5
122°F	267.1
123°F	270.7
124°F	274.3
125°F	278.0
126°F	281.7
127°F	285.4
128°F	289.2
129°F	293.0
130°F	296.9
131°F	300.8
132°F	304.7
133°F	308.6
134°F	312.6
135°F	316.7
136°F	320.7
137°F	324.8
138°F	329.0
139°F	333.2
140°F	337.4
141°F	341.6
142°F	345.9
143°F	350.3
144°F	354.6
145°F	359.0
146°F	363.5
147°F	368.0
148°F	372.5
149°F	377.1
150°F	381.7

R-22 pressure-temperature saturation table in Celsius and kPa
Temp (°C)	Pressure (kPa)
−40°C	4
−39°C	9
−38°C	14
−37°C	19
−36°C	25
−35°C	31
−34°C	37
−33°C	43
−32°C	49
−31°C	56
−30°C	63
−29°C	70
−28°C	77
−27°C	84
−26°C	92
−25°C	100
−24°C	108
−23°C	117
−22°C	126
−21°C	135
−20°C	144
−19°C	154
−18°C	163
−17°C	174
−16°C	184
−15°C	195
−14°C	206
−13°C	217
−12°C	229
−11°C	241
−10°C	253
−9°C	266
−8°C	279
−7°C	293
−6°C	306
−5°C	320
−4°C	335
−3°C	350
−2°C	365
−1°C	381
0°C H₂O freeze	397
1°C	413
2°C	430
3°C	447
4°C	465
5°C	483
6°C	501
7°C	520
8°C	540
9°C	559
10°C	580
11°C	600
12°C	622
13°C	643
14°C	665
15°C	688
16°C	711
17°C	735
18°C	759
19°C	784
20°C	809
21°C	834
22°C	861
23°C	887
24°C	915
25°C	943
26°C	971
27°C	1,000
28°C	1,030
29°C	1,060
30°C	1,091
31°C	1,122
32°C	1,154
33°C	1,186
34°C	1,220
35°C	1,253
36°C	1,288
37°C	1,323
38°C	1,359
39°C	1,395
40°C	1,432
41°C	1,470
42°C	1,508
43°C	1,548
44°C	1,587
45°C	1,628
46°C	1,669
47°C	1,711
48°C	1,754
49°C	1,797
50°C	1,841
51°C	1,886
52°C	1,932
53°C	1,978
54°C	2,026
55°C	2,074
56°C	2,123
57°C	2,172
58°C	2,223
59°C	2,274
60°C	2,326
61°C	2,379
62°C	2,433
63°C	2,488
64°C	2,543
65°C	2,600
66°C	2,657

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-22 PT chart data: CoolProp 7.2.0 (published Helmholtz equations of state / mixture models — see the source citations above).

Lower toxicity, no flame propagation

Lower toxicity (Occupational Exposure Limit ≥ 400 ppm). No flame propagation in air at standard atmospheric pressure and 60°C. R-134a, R-22, R-410A, R-404A, R-744 (CO2) are A1.

Flammability: None (no flame propagation)
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-22

Temp:°F

121.4PSIG(837 kPa)

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

Common service temperatures

32°F

58PSIG

Freezing

45°F

76PSIG

Heat-pump heat

70°F

121PSIG

Standard

75°F

132PSIG

Test ref

80°F

144PSIG

Warm

95°F

182PSIG

Summer peak

Saturation values from CoolProp 7.2.0^[2]. Operating pressure on a running system differs — see what R-22 operating pressures should be.

At a glance

Chemistry

CHClF2

Chlorodifluoromethane

Lubricant compatibility

MOABPOE

Common applications

Air conditioners, heat pumps and medium-temperature refrigeration (existing R-22 systems)

Properties

Boiling point (1 atm)
−41.5°F (−40.8°C)
Critical point
205.1°F (96.1°C) at 709 PSIG
Molar mass
86.47 g/mol
ODP
0.055
GWP (100-yr)
1,810 IPCC AR4 IPCC: AR4 1,810 · AR5 1,760 · AR6 1,960
Atmospheric lifetime
11.9 years
New-equipment status (US)
Class II ODS (HCFC) — US production/import phased out (see timeline).

What is R-22?

R-22 is pure chlorodifluoromethane (CHClF₂), a single-molecule hydrochlorofluorocarbon. It is not a blend and has no temperature glide^[5].

Its ODP is 0.055 (Montreal Protocol value)^[6]. As a class II ozone-depleting substance, R-22 is controlled by the US Clean Air Act ozone phaseout (EPA 40 CFR Part 82 Subpart A): no production or import from January 1, 2010 except for use in equipment manufactured before that date, and no production or import at all from January 1, 2020^[7].

Regulatory & phase-down status

R-22 (HCFC-22) is a class II ozone-depleting substance controlled by the US Clean Air Act ozone phaseout (EPA 40 CFR Part 82 Subpart A), not the AIM Act — the AIM Act and its 40 CFR 84.54 GWP limits apply to HFCs, not to R-22^[6]^[9]. Existing R-22 systems can keep running and be serviced; supply comes from reclaimed R-22 and R-22 produced before 2020^[8].

Service notes

Servicing R-22 equipment requires Section 608 certification; Type II covers high-pressure appliances, the class R-22 falls in^[10]^[11]. Venting R-22 while servicing or disposing of equipment is illegal under Clean Air Act section 608^[12].

Operating cycle

Phase-down timeline

R-22 is an ozone-depleting substance controlled under the US Clean Air Act (class II — HCFC). Milestones below are US production/import limits.

January 1, 2010 — No production or import, except for use in equipment manufactured before January 1, 2010^[7].
January 1, 2020 — No production or import^[7].

Servicing. Existing R-22 systems can stay in use for as long as necessary^[8]. US production and import of R-22 ended on January 1, 2020^[7], so service relies on recovered and reclaimed R-22 and on R-22 produced before 2020^[8].

Global warming potential, in context

Residential air conditioning

Retrofit and replacement paths

Replacements for R-22

Reading the R-22 pressure-temperature chart

The PT chart above plots saturation pressure on the vertical axis against temperature on the horizontal axis. The curve is the liquid–vapor boundary. Above it (higher pressure than saturation at that temperature) the refrigerant is subcooled liquid; below it, superheated vapor; on the curve, liquid and vapor coexist.

R-22 is a pure refrigerant with no temperature glide, so a single saturation curve fully describes the phase boundary^[1]. Read across from a measured temperature to find the saturation pressure that should appear at that point in the cycle; read up from a measured manifold pressure to find the saturation temperature.

Pure refrigerant = simple measurement

No bubble/dew distinction means superheat math = suction line temp − saturation temp directly; subcooling math = saturation temp − liquid line temp directly. No glide correction needed.

R-22 vs R-410A, R-407C, R-422D, R-427A: saturation pressure

Saturation pressure (PSIG, gauge) for R-22 vs R-410A, R-407C, R-422D, R-427A — zeotropic blends shown as dew / bubble. Each column shows the percent difference from R-22. Source: CoolProp 7.2.0 dataset.
Temp	R-22	R-410A	R-407C	R-422D	R-427A
0°F	24.0	48.4(+102%)	19.4 / 29.5(+23%)	21.7 / 28.2(+18%)	18.7 / 28.0(+17%)
40°F	68.6	118.8(+73%)	63.2 / 80.2(+17%)	66.5 / 76.5(+12%)	61.2 / 76.8(+12%)
70°F	121.4	201.8(+66%)	117.3 / 140.5(+16%)	120.9 / 133.3(+10%)	113.7 / 134.7(+11%)
100°F	195.9	318.5(+63%)	196.1 / 225.5(+15%)	198.8 / 213.2(+9%)	190.0 / 216.2(+10%)

Frequently asked

›What is the normal operating pressure of R-22?

Operating pressure depends on evaporator load and ambient; for suction and discharge by outdoor temperature, see What pressure should R-22 be?. The saturation pressures are in the PT table and the comparison table on this page.

›Is R-22 still legal to use?

Yes. EPA says you may keep using R-22 in an existing system for as long as necessary^[8]. Production and import of R-22 ended on January 1, 2020 under the EPA class II ozone phaseout (40 CFR Part 82 Subpart A)^[7]. Service supply now comes from reclaimed R-22 and R-22 produced before 2020^[8].

›Can I retrofit my R-22 system to R-410A?

No. Chemours says R-410A cannot be used for retrofit: it runs at higher pressures than R-22 and is meant for new equipment designed for it^[13].

Blends sold for R-22 retrofits include R-407C^[4] and R-438A (Freon™ MO99)^[14]; Copeland also lists R-422D and R-427A as similar to R-22^[3].

›Why is R-22 being phased out?

R-22 contains chlorine, and its ODP is 0.055^[6]. R-22 is an HCFC; the Montreal Protocol's 1992 Copenhagen Amendment brought HCFCs under control^[15].

The US implemented this through the EPA class II ozone phaseout (40 CFR Part 82 Subpart A): from January 1, 2010, no production or import of R-22 except for use in equipment manufactured before that date; from January 1, 2020, no production or import^[7].

›What lubricant does R-22 use?

Mineral oil or alkylbenzene. Copeland's approved-lubricant list gives both for R-22 compressors^[3]. Converting an R-22 system to R-407C means replacing that oil with POE until residual mineral oil is about 5% or less of the total lubricant^{[4], p. 2}.

›What's the difference between R-22 and Freon?

Freon™ is a Chemours trademark. "Freon 22" is R-22, but "Freon" on its own is not a refrigerant designation^[16].

Download this dataset

Full PT chart for R-22 · 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]
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
[3]
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)
[4]
Freon™ 407C Refrigerant (R-407C) Retrofit Guidelines. Chemours. C-11107 (2/17). https://www.freon.com/en/-/media/files/freon/freon-407c-retrofit-guidelines.pdf (accessed October 2, 2026)
[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]
Ozone-Depleting Substances. US EPA. last updated April 9, 2026. https://www.epa.gov/ozone-layer-protection/ozone-depleting-substances (accessed October 2, 2026)
[7]
Phaseout of Class II Ozone-Depleting Substances. US EPA. last updated April 1, 2026. https://www.epa.gov/ods-phaseout/phaseout-class-ii-ozone-depleting-substances (accessed October 2, 2026)
[8]
Residential Air Conditioning and the Phaseout of HCFC-22: What You Need to Know (EPA-430-FR-20001). US EPA. February 2020. https://www.epa.gov/sites/production/files/2020-03/documents/residential_air_conditioning_and_the_phaseout_of_hcfc-22_what_you_need_to_know_final_508.pdf (accessed October 2, 2026)
[9]
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)
[10]
Section 608 Technician Certification — Test Topics. US EPA. last updated December 5, 2025. https://www.epa.gov/node/121047 (accessed October 2, 2026)
[11]
40 CFR 82.152 — Definitions (Section 608). eCFR (Office of the Federal Register). current. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-82/subpart-F/section-82.152 (accessed October 2, 2026)
[12]
Stationary Refrigeration — Prohibition on Venting Refrigerants. US EPA. last updated December 8, 2025. https://www.epa.gov/section608/stationary-refrigeration-prohibition-venting-refrigerants (accessed October 2, 2026)
[13]
Freon™ 410A Refrigerant (R-410A) Product Information. Chemours. C-10906 (10/16). https://www.freon.com/en/-/media/files/freon/freon-410a-product-information.pdf (accessed October 2, 2026)
[14]
Refrigerant Solutions for Retrofits and New Equipment. Chemours. GRG (1/24). https://www.opteon.com/en/-/media/files/opteon/us-refrigerant-replacement-guide.pdf?rev=96c2a3e55a4846dfa41b438df6bff27c (accessed October 2, 2026)
[15]
Copenhagen Amendment (1992). UNEP Ozone Secretariat. web page. https://ozone.unep.org/treaties/montreal-protocol/amendments/copenhagen-amendment-1992-amendment-montreal-protocol-agreed (accessed October 2, 2026)
[16]
Freon™ 134a Refrigerant (R-134a) Properties, Uses, Storage, and Handling. Chemours. C-11062 (7/26). https://www.freon.com/en/-/media/files/freon/freon-134a-push-bulletin.pdf (accessed October 2, 2026)
[17]
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)
[18]
NIST Chemistry WebBook (SRD 69) saturation data for R-22. NIST. https://webbook.nist.gov/cgi/fluid.cgi?TLow=-40&THigh=150&TInc=10&Digits=6&ID=C75456&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
[19]
IPCC AR4 WG1 (2007), Chapter 2, Table 2.14, 100-year Global Warming Potentials. IPCC AR4 Working Group I. 2007. https://www.ipcc.ch/site/assets/uploads/2018/02/ar4-wg1-chapter2-1.pdf (accessed October 2, 2026)