HVAC PT Charts
RefrigerantASHRAE R-422B

R422B PT Chart

Updated October 12, 2026

R-422B

A1 Lower toxicity, no flame propagationHFC blend AIM Act HFC
R-422B AHRI Guideline N service cylinderIllustration 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. Label: R422B, safety class A1, GWP 2,526. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants.R422BA1GWP 2,526
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[1], section 4.8. Label: R-422B, safety class A1, GWP 2,526. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants[1], section 4.7.
R-125/R-134a/R-600a (55/42/3)

Ternary HFC blend with hydrocarbon (55% R-125 / 42% R-134a / 3% R-600a). A1 safety class, GWP 2,526. Mineral-oil-compatible R-22 retrofit for medium-temperature applications.

R-422B saturation pressure splits across its glide: dew 59.4 PSIG at 40°F, bubble 198.9 PSIG at 100°F, and 110.0–123.5 PSIG dew-to-bubble at 70°F. Use the dew column for superheat and the bubble column for subcooling. The full table below runs from −40°F to 150°F in 1°F steps.

Not yet checked against an independent source.

Saturation @ 70°F
123.5 / 110.0 PSIG
GWP (100-yr)
2,526 US EPA value, 40 CFR 84.64(b)
Temperature glide
7.6°F
Boiling point
bubble −42.6°F / dew −32.6°F
Sourced facts
Temperature glide
7.6°F at a 40°F dew point[3]
R-422B PT calculator Superheat

R-422B PT chart — printable saturation table

Looking for the R-422B 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-422B PT Chart — Pressure-Temperature Saturation Table

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

R-422B · 1° increments · °F / PSIG
Tinted rows: 32°F H₂O freeze
R-422B pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)Bubble (PSIG)Dew (PSIG)
−40°F 1.05.5 in. Hg vac.
−39°F 1.44.8 in. Hg vac.
−38°F 1.94.1 in. Hg vac.
−37°F 2.33.4 in. Hg vac.
−36°F 2.72.6 in. Hg vac.
−35°F 3.11.9 in. Hg vac.
−34°F 3.61.1 in. Hg vac.
−33°F 4.10.3 in. Hg vac.
−32°F 4.50.2
−31°F 5.00.6
−30°F 5.51.0
−29°F 6.01.5
−28°F 6.51.9
−27°F 7.02.3
−26°F 7.52.8
−25°F 8.03.2
−24°F 8.63.7
−23°F 9.14.2
−22°F 9.74.7
−21°F 10.35.2
−20°F 10.95.7
−19°F 11.46.2
−18°F 12.16.7
−17°F 12.77.2
−16°F 13.37.8
−15°F 13.98.3
−14°F 14.68.9
−13°F 15.29.5
−12°F 15.910.1
−11°F 16.610.7
−10°F 17.311.3
−9°F 18.011.9
−8°F 18.712.5
−7°F 19.413.2
−6°F 20.213.8
−5°F 20.914.5
−4°F 21.715.2
−3°F 22.515.9
−2°F 23.316.6
−1°F 24.117.3
0°F 24.918.0
1°F 25.718.8
2°F 26.619.5
3°F 27.420.3
4°F 28.321.1
5°F 29.221.9
6°F 30.122.7
7°F 31.023.5
8°F 31.924.4
9°F 32.925.2
10°F 33.826.1
11°F 34.827.0
12°F 35.827.8
13°F 36.828.8
14°F 37.829.7
15°F 38.830.6
16°F 39.931.6
17°F 40.932.5
18°F 42.033.5
19°F 43.134.5
20°F 44.235.5
21°F 45.436.6
22°F 46.537.6
23°F 47.638.7
24°F 48.839.8
25°F 50.040.8
26°F 51.242.0
27°F 52.443.1
28°F 53.744.2
29°F 54.945.4
30°F 56.246.6
31°F 57.547.8
32°F H₂O freeze58.849.0
33°F 60.250.2
34°F 61.551.5
35°F 62.952.7
36°F 64.354.0
37°F 65.755.3
38°F 67.156.7
39°F 68.558.0
40°F 70.059.4
41°F 71.560.8
42°F 73.062.2
43°F 74.563.6
44°F 76.065.0
45°F 77.666.5
46°F 79.268.0
47°F 80.869.5
48°F 82.471.0
49°F 84.072.5
50°F 85.774.1
51°F 87.475.7
52°F 89.177.3
53°F 90.878.9
54°F 92.580.6
55°F 94.382.2
56°F 96.183.9
57°F 97.985.6
58°F 99.787.4
59°F 101.689.1
60°F 103.490.9
61°F 105.392.7
62°F 107.394.6
63°F 109.296.4
64°F 111.298.3
65°F 113.2100.2
66°F 115.2102.1
67°F 117.2104.0
68°F 119.3106.0
69°F 121.4108.0
70°F 123.5110.0
71°F 125.6112.1
72°F 127.8114.1
73°F 129.9116.2
74°F 132.1118.4
75°F 134.4120.5
76°F 136.6122.7
77°F 138.9124.9
78°F 141.2127.1
79°F 143.6129.3
80°F 145.9131.6
81°F 148.3133.9
82°F 150.7136.3
83°F 153.2138.6
84°F 155.6141.0
85°F 158.1143.4
86°F 160.6145.8
87°F 163.2148.3
88°F 165.8150.8
89°F 168.4153.3
90°F 171.0155.9
91°F 173.7158.5
92°F 176.3161.1
93°F 179.1163.7
94°F 181.8166.4
95°F 184.6169.1
96°F 187.4171.8
97°F 190.2174.6
98°F 193.1177.4
99°F 196.0180.2
100°F 198.9183.1
101°F 201.8186.0
102°F 204.8188.9
103°F 207.8191.8
104°F 210.9194.8
105°F 213.9197.8
106°F 217.0200.9
107°F 220.2204.0
108°F 223.3207.1
109°F 226.5210.2
110°F 229.8213.4
111°F 233.0216.6
112°F 236.3219.9
113°F 239.7223.1
114°F 243.0226.5
115°F 246.4229.8
116°F 249.8233.2
117°F 253.3236.6
118°F 256.8240.1
119°F 260.3243.6
120°F 263.9247.1
121°F 267.5250.7
122°F 271.1254.3
123°F 274.8257.9
124°F 278.5261.6
125°F 282.2265.3
126°F 286.0269.1
127°F 289.8272.9
128°F 293.7276.7
129°F 297.5280.6
130°F 301.5284.5
131°F 305.4288.5
132°F 309.4292.5
133°F 313.4296.5
134°F 317.5300.6
135°F 321.6304.7
136°F 325.8308.9
137°F 330.0313.1
138°F 334.2317.3
139°F 338.4321.6
140°F 342.7325.9
141°F 347.1330.3
142°F 351.5334.7
143°F 355.9339.2
144°F 360.4343.7
145°F 364.9348.3
146°F 369.4352.9
147°F 374.0357.5
148°F 378.6362.2
149°F 383.3367.0
150°F 388.0371.8
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-422B PT chart data: CoolProp 7.2.0 (published Helmholtz equations of state / mixture models — see the source citations above).

A1
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. See full reference.

Saturation pressure-temperature curve

Pressure
Temperature
°F
70°F: 123.5 PSIG (bubble)110.0 PSIG (dew)
Quick lookup — R-422B
123.5 / 110.0PSIG(851 / 759 kPa)
Bubble Dew· zeotropic blend
Range: −40 to 150°F Open full PT calculator →
Common service temperatures
32°F
59 / 49PSIG
Freezing
45°F
78 / 66PSIG
Heat-pump heat
70°F
123 / 110PSIG
Standard
75°F
134 / 120PSIG
Test ref
80°F
146 / 132PSIG
Warm
95°F
185 / 169PSIG
Summer peak

Saturation values from CoolProp 7.2.0 mixture model: R-125/R-134a/R-600a, 55/42/3% by mass[3]. Operating pressure on a running system differs — see the operating-pressure references for in-use values.

At a glance

Chemistry

R-125/R-134a/R-600a (55/42/3)
Ternary HFC blend with isobutane

Lubricant compatibility

MOABPOE

Mineral-oil-compatible R-22 retrofit. Less common than R-422A or R-422D in practice.

Blend composition

  • R-125 55.0%
  • R-134a 42.0%
  • R-600a 3.0%

Common applications

  • R-22 retrofit (medium-temperature)
  • Commercial AC retrofit

Properties

  • Boiling point (1 atm)
    bubble −42.6°F (−41.5°C), dew −32.6°F (−35.9°C)
  • Critical point
    No single point — blend critical locus
  • Molar mass
    108.52 g/mol
  • Temperature glide
    7.6°F
  • ODP
    0
  • GWP (100-yr)
    2,526 US EPA value, 40 CFR 84.64(b) IPCC: AR4 not assessed · AR5 not assessed · AR6 not assessed
  • New-equipment status (US)
    Restricted in 48 new-equipment categories — US new-equipment rules (40 CFR 84.54).

What is R-422B?

R-422B is a ternary HFC blend with a small isobutane (R-600a, hydrocarbon) component. Composition by mass: 55% R-125, 42% R-134a, 3% R-600a. The R-125-R-134a backbone provides medium-temperature capacity matched to R-22; the R-600a addition aids miscibility with mineral oil.

R-422B is part of the broader R-422 family of R-22 retrofit blends: R-422A (low-temp focus, 85% R-125), R-422B (medium-temp, 55% R-125), R-422C (some markets, 82% R-125), R-422D (medium-temp, 65% R-125). It exists in the family for capacity-matching specific equipment configurations.

Where R-422B is used

  • R-22 retrofit, medium-temperature applications (commercial AC, light commercial cooling)
  • Existing equipment where mineral oil staying in the system is desirable
  • Service stock for properties where R-422D or R-422A isn't a better capacity match

Regulatory & phase-down status

R-422B is affected by the AIM Act HFC phase-down — its GWP of 2,526 is well above the 700-GWP limit for new residential and light-commercial AC and heat pumps (40 CFR 84.54(a)(1), (c)(1)). It remains commercially available for service of existing equipment. For new equipment R-422B is not an option; for legacy R-22 equipment that's worth keeping operational, R-422B and the rest of the R-422 family remain viable until full replacement.

Modern R-22 retrofit guidance favors full system replacement with R-32 (A2L, GWP 675) or R-454B (A2L, GWP 465) rather than HFC retrofit, because the new equipment is more efficient and the HFC retrofits face their own AIM Act phase-down.

Service notes

Mineral oil (MO), alkylbenzene (AB), and POE oils are all compatible. The 3% R-600a hydrocarbon component aids mineral oil return. R-422B has substantial temperature glide (~7°F) — use the dew curve for superheat and the bubble curve for subcooling, matching the procedure for any zeotropic blend.

EPA Section 608 Type II or Universal certification covers R-422B. Recovery is required.

Temperature glide

Temperature glide across evaporator at constant pressureR-422B at 70 PSIG suction→ refrigerant flow →Entry: 40.0°F Mid: 43.7°F Exit: 47.3°F Glide = 7.3°F Position along evaporator coil40°F 47°F

R-422B is a zeotropic blend: at constant pressure it boils across a temperature range rather than at a single point. Use the dew curve for superheat, bubble curve for subcooling.

Operating cycle

CompressorRaises pressureCondenserRejects heat to outdoorsExpansion deviceDrops pressureEvaporatorAbsorbs heat from indoorsDischarge: 230 PSIG, 180°F Liquid: 230 PSIG, 100°F Evap inlet: 59 PSIG, 40°F (two-phase)Suction: 59 PSIG, 50°F Example cycle for R-422B (40°F evap, 110°F condenser, 10°F superheat, 10°F subcooling)

Phase-down timeline

R-422B contains HFC-125 and HFC-134a, regulated substances under the AIM Act. Its GWP under 40 CFR 84.64 is 2,526, at or above the limit in 48 of the categories 40 CFR 84.54 restricts (listed under “All 84.54 categories restricting R-422B”).

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)).

Full 40 CFR 84.54 new-equipment rules for R-422B →

US new-equipment rules (40 CFR 84.54)

R-422B contains HFC-125 and HFC-134a, regulated substances under the AIM Act. Under 40 CFR 84.64(b) its GWP is 2,526: each component's GWP times its mass fraction; components without a GWP under 84.64 are left out (84.64(c)). That value is compared against each 40 CFR 84.54 subsector limit below.

All 84.54 categories restricting R-422B (48)
Refrigeration, air conditioning & heat pumps (41)
January 1, 2025Self-contained residential & light-commercial AC and heat pump productsGWP ≥ 700(a)(1)
January 1, 2025Chillers for comfort coolingGWP ≥ 700(a)(10)(i)
January 1, 2025Chillers for ice rinksGWP ≥ 700(a)(10)(ii)
January 1, 2025Residential dehumidifiersGWP ≥ 700(a)(2)
January 1, 2025Household refrigerators and freezersGWP ≥ 150(a)(3)
January 1, 2025Retail food refrigeration — stand-alone unitsGWP ≥ 150(a)(4)
January 1, 2025Vending machinesGWP ≥ 150(a)(5)
January 1, 2025Refrigerated transport — road and marine (self-contained products)listed refrigerant(a)(7)
January 1, 2025Residential & light-commercial AC and heat pump systems (except VRF)GWP ≥ 700(c)(1)
January 1, 2025Chillers for comfort coolingGWP ≥ 700(c)(3)
January 1, 2025Ice rinksGWP ≥ 700(c)(4)
January 1, 2025Refrigerated transport — road or marine systemslisted refrigerant(c)(8)
January 1, 2026Chillers for industrial process refrigeration, fluid exiting the chiller warmer than −22°F (−30°C)GWP ≥ 700(a)(10)(iii)
January 1, 2026Industrial 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, 2026Industrial 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, 2026Ice makers — batch type up to 1,000 lb of ice per 24 h and continuous type up to 1,200 lb per 24 hGWP ≥ 150(a)(8)(i)
January 1, 2026Industrial 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 cascadeGWP ≥ 150(c)(10)(i)
January 1, 2026Industrial 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, 2026Industrial process refrigeration — high-temperature side of cascade systems, evaporator inlet warmer than −22°F (−30°C)GWP ≥ 300(c)(10)(iii)
January 1, 2026Variable refrigerant flow (VRF) residential & light-commercial AC and heat pump systemsGWP ≥ 700(c)(2)
January 1, 2026Chillers for industrial process refrigeration, fluid exiting the chiller warmer than −22°F (−30°C)GWP ≥ 700(c)(5)(i)
July 27, 2026Refrigerated transport — intermodal containers with a box temperature of −31°F (−35°C) or higherGWP ≥ 700(a)(6)
July 27, 2026Retail food refrigeration — remote condensing unitsGWP ≥ 1,400(c)(11)(i)
July 27, 2026Refrigerated transport — intermodal containers with a box temperature of −31°F (−35°C) or higherGWP ≥ 700(c)(7)
July 27, 2026Cold storage warehouse systemsGWP ≥ 700(c)(9)(i)
January 1, 2027Self-contained products in data center, information technology equipment facility, and computer room coolingGWP ≥ 700(a)(11)
January 1, 2027Ice makers — batch type above 1,000 lb of ice per 24 h and continuous type above 1,200 lb per 24 hlisted refrigerant(a)(8)(ii)
January 1, 2027Refrigerated food processing and dispensing products outside the scope of UL 621, charge 500 g or lessGWP ≥ 150(a)(9)(i)
January 1, 2027Refrigerated food processing and dispensing products outside the scope of UL 621, charge greater than 500 glisted refrigerant(a)(9)(ii)
January 1, 2027Supermarket systemsGWP ≥ 1,400(c)(12)(i)
January 1, 2027Data center, information technology equipment facility, and computer room cooling systemsGWP ≥ 700(c)(13)
January 1, 2027Automatic commercial ice machines with a remote condenserlisted refrigerant(c)(14)
January 1, 2027Refrigerated food processing and dispensing equipment with a remote condenserlisted refrigerant(c)(15)
January 1, 2028Chillers for industrial process refrigeration, fluid exiting the chiller from −58°F to −22°F (−50°C to −30°C)GWP ≥ 700(a)(10)(iv)
January 1, 2028Industrial process refrigeration products (non-chiller), refrigerant entering the evaporator from −58°F to −22°F (−50°C to −30°C)GWP ≥ 700(a)(12)(iii)
January 1, 2028Refrigerated food processing and dispensing products within the scope of UL 621 (ice cream makers)listed refrigerant(a)(9)(iii)
January 1, 2028Industrial process refrigeration systems (non-chiller), evaporator inlet from −58°F to −22°F (−50°C to −30°C)GWP ≥ 700(c)(10)(iv)
January 1, 2028Chillers for industrial process refrigeration, fluid exiting the chiller from −58°F to −22°F (−50°C to −30°C)GWP ≥ 700(c)(6)(i)
January 1, 2032Retail food refrigeration — remote condensing unitsGWP ≥ 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, 2032Supermarket systemsGWP ≥ 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, 2032Cold storage warehouse systemsGWP ≥ 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, 2024Motor 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 2028Motor 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 upfittersGWP ≥ 150(a)(13)(ii)
January 1, 2028Motor 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, 2025Foam 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 foamGWP ≥ 150(a)(14)
January 1, 2026Foam products in the (a)(14) formulations for use in space and military applicationsGWP ≥ 150(a)(15)
Aerosol propellants / solvents (2)
January 1, 2025Aerosol productsGWP ≥ 150(a)(16)(i)
January 1, 2028Aerosol 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-422B 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-422B equipment in supermarket systems, refrigerated transport or automatic commercial ice makers must be done with reclaimed refrigerant[2].

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

R-22 retrofit blends

R-407C1.8kR-221.8kR-427A2.1kR-438A2.3kR-417A2.3kR-422B2.5kR-421A2.6kR-422D2.7kR-422A3.1k

Retrofit and replacement paths

R-422B replaces

Replacements for R-422B

R-422B vs R-22, R-32, R-454B: saturation pressure

Saturation pressure (PSIG, gauge) for R-422B vs R-22, R-32, R-454B — zeotropic blends shown as dew / bubble. Each column shows the percent difference from R-422B. Source: CoolProp 7.2.0 dataset.
TempR-422BR-22R-32R-454B
0°F18.0 / 24.924.0(−3%)49.3(+98%)42.7 / 45.3(+82%)
40°F59.4 / 70.068.6(−2%)121.0(+73%)107.0 / 112.0(+60%)
70°F110.0 / 123.5121.4(−2%)205.8(+67%)183.1 / 190.5(+54%)
100°F183.1 / 198.9195.9(−1%)325.7(+64%)290.9 / 300.8(+51%)

Frequently asked

›What's the difference between R-422A, R-422B, and R-422D?

All three are HFC ternary blends with small hydrocarbon for mineral oil miscibility. R-422A is R-125/R-134a/R-600a at 85.1/11.5/3.4 — low-temperature focus, high R-125 for high vapor pressure. R-422B is 55/42/3 — medium-temperature focus, more R-134a content. R-422D is R-125/R-134a/R-600a at 65.1/31.5/3.4 — between the other two, for medium-temperature AC and refrigeration. R-422A is preferred for low-temperature; R-422B exists as a capacity-specific option.

›Why does R-422B have glide while R-422A is closer to azeotropic?

R-422A's 85% R-125 content makes it close to pure R-125 behavior — small fractions of other components produce small glide. R-422B's more balanced 55/42 R-125/R-134a composition spans a wider range of pure-component boiling points (R-125 at −49°C vs R-134a at −26°C), producing larger glide. Larger glide affects how superheat and subcooling are measured (use dew for superheat, bubble for subcooling) but does not preclude use in equipment originally designed for azeotropic refrigerants.

›What lubricant does R-422B use?

Mineral oil (MO), alkylbenzene (AB), and POE are all compatible. The 3% R-600a component aids HFC-mineral-oil miscibility that would otherwise be poor for a 55/42 R-125/R-134a blend alone.

›Should I retrofit to R-422B or do a full system replacement?

Decision factors: (1) equipment age — over 15 years and full replacement is usually more cost-effective; (2) leak history — multiple leaks point to system condition issues that retrofit won't fix; (3) future-proofing — R-422B faces its own AIM Act phase-down, so retrofit buys time but not permanently; (4) energy cost differential — new R-32 or R-454B equipment is more efficient than R-22 era equipment. For systems under 10 years with no leaks where capital is constrained, R-422B retrofit is reasonable. For older systems, replace.

›What is the GWP of R-422B?

2526, mass-weighted from components: R-125 (3,500) at 55%, R-134a (1,430) at 42%, R-600a (1) at 3%. This is well above the 700-GWP limit for new residential and light-commercial AC and heat pumps (40 CFR 84.54(a)(1), (c)(1)) but adequate-to-better than R-22's GWP 1,810 (though R-22 has ODP, which R-422B does not — different concerns).

Download this dataset

Full PT chart for R-422B · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

  1. [1]
    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)
  2. [2]
    40 CFR 84.112 — Reclamation. eCFR (Office of the Federal Register). up to date as of 9/25/2026. https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84/subpart-C/section-84.112 (accessed October 2, 2026). 89 FR 82859, Oct. 11, 2024
  3. [3]
    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

Data sources & provenance

PT chart
CoolProp 7.2.0 mixture model: R-125/R-134a/R-600a, 55/42/3% by mass
Properties
CoolProp 7.2.0 + ASHRAE Standard 34-2022
GWP (100-yr)
US EPA value, 40 CFR 84.64(b) · IPCC AR4/AR5/AR6 on the GWP rankings
Table computed
October 2026

Reference material. Always verify pressure values against the equipment data plate and manufacturer service literature before charging or troubleshooting a specific system. Saturation pressure differs from operating pressure — see superheat & subcooling fundamentals. See how this PT table is calculated in our methodology.