HVAC PT Charts
RefrigerantASHRAE R-407C

R407C PT Chart

Updated October 12, 2026

R-407C

A1 Lower toxicity, no flame propagationHFC blend AIM Act HFC
R-407C pre-2020 brown service cylinderIllustration of an R-407C cylinder painted brown, the color AHRI Guideline N-2017 lists for R-407C. Label: R407C, safety class A1, GWP 1,774. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants.R407CA1GWP 1,774
since 2020
R-407C 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: R407C, safety class A1, GWP 1,774. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants.R407CA1GWP 1,774
Before 2020, AHRI Guideline N assigned R-407C containers the color brown (PMS 471)[14], 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[14], section 4.8. Label: R-407C, safety class A1, GWP 1,774. No red band: AHRI Guideline N-2017 reserves it for flammable refrigerants[14], section 4.7.
R-32/R-125/R-134a (23/25/52)

A blend of 23% R-32, 25% R-125 and 52% R-134a by mass[5], A1[2], GWP 1,774 on the US EPA basis[6]. Its glide is about 11.1°F at 63.2 psig (computed from the table).

R-407C saturation pressure splits across its glide: dew 63.2 PSIG at 40°F, bubble 225.5 PSIG at 100°F, and 117.3–140.5 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.

Checked against the Arkema Forane® 407C pressure-temperature chart[15] at 55 points from −40°F to 150°F: largest difference 0.05 psi. The chart states it was generated with NIST REFPROP 9.0.

Saturation @ 70°F
140.5 / 117.3 PSIG
GWP (100-yr)
1,774 US EPA value, 40 CFR 84.64(b)
Temperature glide
11.1°F
Boiling point
bubble −46.5°F / dew −33.9°F
Sourced facts
ASHRAE safety class
A1[2]
Composition (mass)
23% R-32 / 25% R-125 / 52% R-134a[5]
GWP (100-yr)
1,774[6]
ODP
0[17]
Normal boiling point
bubble −46.5°F (−43.6°C), dew −33.9°F (−36.6°C)[3]
Temperature glide
11.1°F at a 40°F dew point[3]
Lubricant
POE[4]
Application
R-22 retrofit[4]
R-407C PT calculator Operating pressures Superheat

R-407C PT chart — printable saturation table

Looking for the R-407C 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-407C PT Chart — Pressure-Temperature Saturation Table

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

R-407C · 1° increments · °F / PSIG
Tinted rows: 32°F H₂O freeze
R-407C pressure-temperature saturation table in Fahrenheit and PSIG
Temp (°F)Bubble (PSIG)Dew (PSIG)
−40°F 2.74.6 in. Hg vac.
−39°F 3.23.9 in. Hg vac.
−38°F 3.73.2 in. Hg vac.
−37°F 4.12.4 in. Hg vac.
−36°F 4.61.6 in. Hg vac.
−35°F 5.10.9 in. Hg vac.
−34°F 5.60.1 in. Hg vac.
−33°F 6.10.4
−32°F 6.60.8
−31°F 7.21.2
−30°F 7.71.6
−29°F 8.32.1
−28°F 8.82.5
−27°F 9.43.0
−26°F 10.03.5
−25°F 10.63.9
−24°F 11.24.4
−23°F 11.84.9
−22°F 12.45.4
−21°F 13.15.9
−20°F 13.76.5
−19°F 14.47.0
−18°F 15.17.6
−17°F 15.88.1
−16°F 16.58.7
−15°F 17.29.3
−14°F 17.99.9
−13°F 18.710.5
−12°F 19.411.1
−11°F 20.211.7
−10°F 20.912.3
−9°F 21.713.0
−8°F 22.513.7
−7°F 23.414.3
−6°F 24.215.0
−5°F 25.015.7
−4°F 25.916.4
−3°F 26.817.2
−2°F 27.717.9
−1°F 28.618.7
0°F 29.519.4
1°F 30.420.2
2°F 31.421.0
3°F 32.321.8
4°F 33.322.6
5°F 34.323.5
6°F 35.324.3
7°F 36.425.2
8°F 37.426.1
9°F 38.527.0
10°F 39.527.9
11°F 40.628.8
12°F 41.729.8
13°F 42.930.7
14°F 44.031.7
15°F 45.232.7
16°F 46.333.7
17°F 47.534.7
18°F 48.735.7
19°F 50.036.8
20°F 51.237.9
21°F 52.539.0
22°F 53.840.1
23°F 55.141.2
24°F 56.442.3
25°F 57.743.5
26°F 59.144.7
27°F 60.545.9
28°F 61.947.1
29°F 63.348.3
30°F 64.749.6
31°F 66.250.8
32°F H₂O freeze67.752.1
33°F 69.253.4
34°F 70.754.8
35°F 72.256.1
36°F 73.857.5
37°F 75.458.9
38°F 77.060.3
39°F 78.661.7
40°F 80.263.2
41°F 81.964.6
42°F 83.666.1
43°F 85.367.6
44°F 87.069.2
45°F 88.870.7
46°F 90.672.3
47°F 92.473.9
48°F 94.275.5
49°F 96.077.2
50°F 97.978.8
51°F 99.880.5
52°F 101.782.2
53°F 103.784.0
54°F 105.685.7
55°F 107.687.5
56°F 109.689.3
57°F 111.791.2
58°F 113.793.0
59°F 115.894.9
60°F 117.996.8
61°F 120.198.7
62°F 122.3100.7
63°F 124.4102.7
64°F 126.7104.7
65°F 128.9106.7
66°F 131.2108.8
67°F 133.5110.9
68°F 135.8113.0
69°F 138.1115.1
70°F 140.5117.3
71°F 142.9119.5
72°F 145.4121.7
73°F 147.8124.0
74°F 150.3126.2
75°F 152.8128.5
76°F 155.4130.9
77°F 157.9133.2
78°F 160.5135.6
79°F 163.2138.1
80°F 165.8140.5
81°F 168.5143.0
82°F 171.2145.5
83°F 174.0148.0
84°F 176.8150.6
85°F 179.6153.2
86°F 182.4155.9
87°F 185.3158.5
88°F 188.2161.2
89°F 191.1163.9
90°F 194.1166.7
91°F 197.1169.5
92°F 200.1172.3
93°F 203.2175.2
94°F 206.3178.1
95°F 209.4181.0
96°F 212.5183.9
97°F 215.7186.9
98°F 219.0190.0
99°F 222.2193.0
100°F 225.5196.1
101°F 228.8199.3
102°F 232.2202.4
103°F 235.6205.6
104°F 239.0208.9
105°F 242.4212.1
106°F 245.9215.4
107°F 249.5218.8
108°F 253.0222.2
109°F 256.6225.6
110°F 260.3229.0
111°F 263.9232.5
112°F 267.6236.1
113°F 271.4239.6
114°F 275.1243.3
115°F 279.0246.9
116°F 282.8250.6
117°F 286.7254.3
118°F 290.6258.1
119°F 294.6261.9
120°F 298.6265.8
121°F 302.6269.7
122°F 306.7273.6
123°F 310.8277.6
124°F 315.0281.6
125°F 319.2285.7
126°F 323.4289.8
127°F 327.7293.9
128°F 332.0298.1
129°F 336.3302.4
130°F 340.7306.6
131°F 345.2311.0
132°F 349.6315.4
133°F 354.2319.8
134°F 358.7324.2
135°F 363.3328.8
136°F 368.0333.3
137°F 372.6337.9
138°F 377.4342.6
139°F 382.1347.3
140°F 386.9352.1
141°F 391.8356.9
142°F 396.7361.7
143°F 401.6366.6
144°F 406.6371.6
145°F 411.7376.6
146°F 416.7381.7
147°F 421.8386.8
148°F 427.0392.0
149°F 432.2397.2
150°F 437.5402.5
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-407C 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[2], safety group definitions and refrigerant safety classifications. See full reference.

Saturation pressure-temperature curve

Pressure
Temperature
°F
70°F: 140.5 PSIG (bubble)117.3 PSIG (dew)
Quick lookup — R-407C
140.5 / 117.3PSIG(969 / 809 kPa)
Bubble Dew· zeotropic blend
Range: −40 to 150°F Open full PT calculator →
Common service temperatures
32°F
68 / 52PSIG
Freezing
45°F
89 / 71PSIG
Heat-pump heat
70°F
141 / 117PSIG
Standard
75°F
153 / 129PSIG
Test ref
80°F
166 / 141PSIG
Warm
95°F
209 / 181PSIG
Summer peak

Saturation values from CoolProp 7.2.0 mixture model: R-32/R-125/R-134a, 23/25/52% by mass[3]. Operating pressure on a running system differs — see what R-407C operating pressures should be.

At a glance

Chemistry

R-32/R-125/R-134a (23/25/52)
Ternary HFC blend

Lubricant compatibility

POEMO

POE required. Sold as a replacement for R-22 in air conditioners and heat pumps[4], p. 1. Chemours calls it the similar-pressure replacement for R-22[4], p. 1.

Blend composition

  • R-32 23.0%
  • R-125 25.0%
  • R-134a 52.0%

Trade names

  • Freon™ 407C — Chemours[4]
  • Forane® 407C — Arkema[15]

Common applications

  • DX air conditioners and heat pumps (R-22 replacement)
  • Medium-temperature refrigeration (R-22 replacement)

Properties

  • Boiling point (1 atm)
    bubble −46.5°F (−43.6°C), dew −33.9°F (−36.6°C)
  • Critical point
    No single point — blend critical locus
  • Molar mass
    86.20 g/mol
  • Temperature glide
    11.1°F
  • ODP
    0
  • GWP (100-yr)
    1,774 US EPA value, 40 CFR 84.64(b) IPCC: AR4 1,774 · AR5 1,624 · AR6 1,908
  • New-equipment status (US)
    Restricted in 45 new-equipment categories — US new-equipment rules (40 CFR 84.54).

What is R-407C?

R-407C is a ternary blend of 23% R-32, 25% R-125, and 52% R-134a by mass[5].

Where R-407C is used

  • Replacement for R-22 in DX air conditioners and heat pumps, and in many medium-temperature refrigeration systems[4], p. 1

Service notes

POE absorbs water — minimize its contact with air and keep it in a sealed metal container[4], p. 2.

Use dew temperature for superheat (suction line) and bubble temperature for subcooling (liquid line)[7]. Single-curve approximation introduces measurement error equal to the glide. Charge it by removing liquid from the cylinder[4], p. 3.

Temperature glide

Temperature glide across evaporator at constant pressureR-407C at 80 PSIG suction→ refrigerant flow →Entry: 40.0°F Mid: 45.4°F Exit: 50.8°F Glide = 10.8°F Position along evaporator coil40°F 51°F

R-407C 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: 260 PSIG, 180°F Liquid: 260 PSIG, 100°F Evap inlet: 63 PSIG, 40°F (two-phase)Suction: 63 PSIG, 50°F Example cycle for R-407C (40°F evap, 110°F condenser, 10°F superheat, 10°F subcooling)

Phase-down timeline

R-407C contains HFC-32, HFC-125 and HFC-134a, regulated substances under the AIM Act[1], 42 U.S.C. 7675(c)(1). Its GWP under 40 CFR 84.64 is 1,774, at or above the limit in 45 of the categories 40 CFR 84.54 restricts (listed under “All 84.54 categories restricting R-407C”).

  • From January 1, 2025 — new self-contained residential & light-commercial AC and heat pump products: manufacture / import restricted (GWP ≥ 700)[11], §84.54(a)(1).
  • From January 1, 2025 — new residential & light-commercial AC and heat pump systems (except VRF): installation restricted (GWP ≥ 700), unless every specified component was manufactured or imported before January 1, 2025[11], §84.54(c)(1).
  • From January 1, 2026 — new variable refrigerant flow (VRF) residential & light-commercial AC and heat pump systems: installation restricted (GWP ≥ 700); systems whose specified components were all manufactured or imported before January 1, 2026 may be installed until January 1, 2027, or until January 1, 2028 when a building permit issued before October 5, 2023 specifies the refrigerant[11], §84.54(c)(2).
  • From January 1, 2028 — new self-contained residential & light-commercial AC and heat pump products: sale and distribution restricted (GWP ≥ 700)[11], §84.54(b).

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))[1].

Full 40 CFR 84.54 new-equipment rules for R-407C →

US new-equipment rules (40 CFR 84.54)

R-407C contains HFC-32, HFC-125 and HFC-134a, regulated substances under the AIM Act[1], 42 U.S.C. 7675(c)(1). Under 40 CFR 84.64(b) its GWP is 1,774: 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.

EffectiveEquipment subsectorLimitRestriction
January 1, 2025Self-contained residential & light-commercial AC and heat pump productsGWP ≥ 700Manufacture / import(a)(1)
January 1, 2025Residential & light-commercial AC and heat pump systems (except VRF)GWP ≥ 700Installation(c)(1)
January 1, 2026Variable refrigerant flow (VRF) residential & light-commercial AC and heat pump systemsGWP ≥ 700Installation(c)(2)
January 1, 2028Self-contained residential & light-commercial AC and heat pump productsGWP ≥ 700Sale / distribution(b)
All 84.54 categories restricting R-407C (45)[11]
Refrigeration, air conditioning & heat pumps (38)
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, 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, 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, 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-407C 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-407C equipment in supermarket systems, refrigerated transport or automatic commercial ice makers must be done with reclaimed refrigerant[16].

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

R-454B465R-32675R-452B698R-407C1.8kR-221.8kR-410A2.1k

Retrofit and replacement paths

R-407C replaces

Replacements for R-407C

Reading the R-407C PT chart — significant glide, dew/bubble matter

The PT chart shows two distinct curves: bubble (saturated liquid) and dew (saturated vapor). Service measurement requires selecting the correct curve based on which line of the system is being measured.

For suction-line superheat measurement, use the dew curve[7]. The dew temperature at the measured suction pressure is the saturation reference[7]. At 63.2 psig, where R-407C's dew point is 40°F, its bubble point is 28.9°F — so reading the bubble column instead of the dew column overstates superheat by 11.1°F.

For liquid-line subcooling measurement, use the bubble curve[7].

R-407C vs R-22, R-32, R-454B, R-452B: saturation pressure

Saturation pressure (PSIG, gauge) for R-407C vs R-22, R-32, R-454B, R-452B — zeotropic blends shown as dew / bubble. Each column shows the percent difference from R-407C. Source: CoolProp 7.2.0 dataset.
TempR-407CR-22R-32R-454BR-452B
0°F19.4 / 29.524.0(−19%)49.3(+67%)42.7 / 45.3(+54%)43.5 / 45.8(+55%)
40°F63.2 / 80.268.6(−15%)121.0(+51%)107.0 / 112.0(+40%)108.8 / 113.2(+41%)
70°F117.3 / 140.5121.4(−14%)205.8(+46%)183.1 / 190.5(+36%)185.9 / 192.5(+37%)
100°F196.1 / 225.5195.9(−13%)325.7(+44%)290.9 / 300.8(+33%)295.1 / 303.9(+35%)

Frequently asked

›What is the normal operating pressure of R-407C?

Operating pressure depends on evaporator load and ambient; for suction and discharge by outdoor temperature, see What pressure should R-407C be?. The saturation pressures are in the PT table and the comparison table on this page.

›Can I retrofit R-22 to R-407C in my existing AC system?

Yes, with an oil change. Chemours' retrofit guidelines for Freon™ 407C call for replacing the mineral oil with POE until residual mineral oil is about 5% or less of the total lubricant — usually three or four oil changes — and put the optimum charge at 90–95% of the original R-22 charge by weight, starting at about 80%[4], pp. 2, 4–5.

›What does R-407C's GWP of 1,774 mean?

On the US EPA basis R-407C's GWP is 1,774, so releasing 1 kg absorbs about 1,774 times as much energy over 100 years as releasing 1 kg of CO₂[6][8]. Its GWP (1,774) is close to R-22's 1,810[6][9].

›Why does R-407C have 11°F glide while R-22 has none?

R-22 is a pure single-component refrigerant — no glide. R-407C is a zeotropic blend of three components with widely different boiling points (R-32 at −61°F, R-125 at −55°F, R-134a at −15°F). Its bubble and dew points differ by about 11.1°F at 63.2 psig, the pressure where its dew point is 40°F.

›What lubricant does R-407C use?

Polyolester (POE) oil[10].

›How do I measure superheat on R-407C?

Use the dew temperature at suction pressure[7].

›Is R-407C being phased out?

Yes — in the subsectors where its GWP (1,774) is at or above the 40 CFR 84.54 limit. See the US new-equipment rules section on this page[11].

40 CFR 84.54 does not restrict servicing existing R-407C equipment[11].

›Is R-407C safe to handle?

ASHRAE safety group A1: lower toxicity and no flame propagation[2]. Servicing it requires Section 608 certification; Type II covers high-pressure appliances, the class R-407C falls in[12][13].

Download this dataset

Full PT chart for R-407C · CC BY 4.0 · attribute the source

CSV JSON

Sources & citations

  1. [1]
    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)
  2. [2]
    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)
  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
  4. [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. [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. [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. [7]
    Opteon™ XP40 Retrofit Guidelines to Replace R-404A/R-507. Chemours. C-10023 (1/16). https://www.opteon.com/en/-/media/files/opteon/opteon-xp40-retrofit-guidelines-r-404a-r-507.pdf (accessed October 5, 2026)
  8. [8]
    Understanding Global Warming Potentials. US EPA. last updated December 29, 2025. https://www.epa.gov/ghgemissions/understanding-global-warming-potentials (accessed October 2, 2026)
  9. [9]
    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)
  10. [10]
    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)
  11. [11]
    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)
  12. [12]
    Section 608 Technician Certification — Test Topics. US EPA. last updated December 5, 2025. https://www.epa.gov/node/121047 (accessed October 2, 2026)
  13. [13]
    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)
  14. [14]
    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)
  15. [15]
    Arkema Forane® 407C pressure-temperature chart. Arkema. https://forane.arkema.com/files/live/sites/shared_arkema/files/downloads/fluorochemicals/forane-407c-pressure-temperature-chart.pdf (accessed October 2, 2026). The chart states the data were generated with NIST REFPROP, Version 9.0 (2010)
  16. [16]
    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
  17. [17]
    Substitutes in Residential and Light Commercial Air Conditioning and Heat Pumps. US EPA (SNAP). last updated March 19, 2026. https://www.epa.gov/snap/substitutes-residential-and-light-commercial-air-conditioning-and-heat-pumps (accessed October 5, 2026)

Data sources & provenance

PT chart
CoolProp 7.2.0 mixture model: R-32/R-125/R-134a, 23/25/52% by mass
Cross-checked against
Arkema Forane® 407C pressure-temperature chart[15]
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 and independently checked in our methodology.