R-449A
Quaternary HFC/HFO blend marketed as Chemours Opteon XP40 — A1 safety, GWP 1397 (65% lower than R-404A), ~10°F glide. The Chemours competitor to Honeywell's R-448A for R-404A drop-in retrofit.
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
Saturation values from CoolProp 7.2.0 R449A.mix. Operating pressure on a running system differs — see the operating-pressure references for in-use values.
R-449A PT chart PDF — printable saturation table
Looking for the R-449A 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). Important service temperatures (normal boiling point, freezing point of water, residential AC evap and condenser targets) are tinted and tagged in the table for at-a-glance shop reference.
R-449A PT Chart — Pressure-Temperature Saturation Table
1° increments · Source: CoolProp 7.2.0 / manufacturer datasheet · hvacptcharts.com
| Temp (°F) | Bubble (PSIG) | Dew (PSIG) | Glide (PSI) |
|---|---|---|---|
| -40°F | 4.5 | -0.1 | 4.6 |
| -39°F | 5.0 | 0.4 | 4.7 |
| -38°F | 5.5 | 0.8 | 4.8 |
| -37°F | 6.0 | 1.2 | 4.9 |
| -36°F | 6.6 | 1.6 | 5.0 |
| -35°F | 7.1 | 2.0 | 5.1 |
| -34°F | 7.7 | 2.5 | 5.2 |
| -33°F | 8.2 | 3.0 | 5.2 |
| -32°F | 8.8 | 3.4 | 5.3 |
| -31°F | 9.3 | 3.9 | 5.5 |
| -30°F | 9.9 | 4.4 | 5.5 |
| -29°F | 10.5 | 4.9 | 5.7 |
| -28°F | 11.1 | 5.4 | 5.8 |
| -27°F | 11.8 | 5.9 | 5.9 |
| -26°F | 12.4 | 6.4 | 6.0 |
| -25°F | 13.0 | 7.0 | 6.1 |
| -24°F | 13.7 | 7.5 | 6.2 |
| -23°F | 14.4 | 8.1 | 6.3 |
| -22°F | 15.0 | 8.6 | 6.4 |
| -21°F | 15.7 | 9.2 | 6.5 |
| -20°F | 16.4 | 9.8 | 6.7 |
| -19°F | 17.1 | 10.4 | 6.8 |
| -18°F | 17.9 | 11.0 | 6.9 |
| -17°F | 18.6 | 11.6 | 7.0 |
| -16°F | 19.4 | 12.3 | 7.1 |
| -15°F | 20.1 | 12.9 | 7.2 |
| -14°F | 20.9 | 13.6 | 7.4 |
| -13°F | 21.7 | 14.3 | 7.5 |
| -12°F | 22.5 | 14.9 | 7.6 |
| -11°F | 23.4 | 15.6 | 7.7 |
| -10°F | 24.2 | 16.3 | 7.9 |
| -9°F | 25.1 | 17.1 | 8.0 |
| -8°F | 25.9 | 17.8 | 8.1 |
| -7°F | 26.8 | 18.5 | 8.3 |
| -6°F | 27.7 | 19.3 | 8.4 |
| -5°F | 28.6 | 20.1 | 8.5 |
| -4°F | 29.5 | 20.9 | 8.6 |
| -3°F | 30.5 | 21.7 | 8.8 |
| -2°F | 31.4 | 22.5 | 8.9 |
| -1°F | 32.4 | 23.3 | 9.1 |
| 0°F | 33.4 | 24.2 | 9.2 |
| 1°F | 34.4 | 25.0 | 9.3 |
| 2°F | 35.4 | 25.9 | 9.5 |
| 3°F | 36.4 | 26.8 | 9.6 |
| 4°F | 37.5 | 27.7 | 9.8 |
| 5°F | 38.5 | 28.6 | 9.9 |
| 6°F | 39.6 | 29.5 | 10.1 |
| 7°F | 40.7 | 30.5 | 10.2 |
| 8°F | 41.8 | 31.5 | 10.4 |
| 9°F | 43.0 | 32.4 | 10.5 |
| 10°F | 44.1 | 33.4 | 10.7 |
| 11°F | 45.3 | 34.5 | 10.8 |
| 12°F | 46.5 | 35.5 | 11.0 |
| 13°F | 47.6 | 36.5 | 11.1 |
| 14°F | 48.9 | 37.6 | 11.3 |
| 15°F | 50.1 | 38.7 | 11.4 |
| 16°F | 51.4 | 39.8 | 11.6 |
| 17°F | 52.6 | 40.9 | 11.8 |
| 18°F | 53.9 | 42.0 | 11.9 |
| 19°F | 55.2 | 43.1 | 12.1 |
| 20°FMT evap target | 56.6 | 44.3 | 12.2 |
| 21°F | 57.9 | 45.5 | 12.4 |
| 22°F | 59.3 | 46.7 | 12.6 |
| 23°F | 60.7 | 47.9 | 12.8 |
| 24°F | 62.1 | 49.2 | 12.9 |
| 25°F | 63.5 | 50.4 | 13.1 |
| 26°F | 64.9 | 51.7 | 13.2 |
| 27°F | 66.4 | 53.0 | 13.4 |
| 28°F | 67.9 | 54.3 | 13.6 |
| 29°F | 69.4 | 55.6 | 13.8 |
| 30°F | 70.9 | 57.0 | 13.9 |
| 31°F | 72.5 | 58.4 | 14.1 |
| 32°FH₂O freeze | 74.0 | 59.8 | 14.3 |
| 33°F | 75.6 | 61.2 | 14.5 |
| 34°F | 77.2 | 62.6 | 14.6 |
| 35°FMT box temp | 78.9 | 64.1 | 14.8 |
| 36°F | 80.5 | 65.5 | 15.0 |
| 37°F | 82.2 | 67.0 | 15.2 |
| 38°F | 83.9 | 68.5 | 15.4 |
| 39°F | 85.6 | 70.1 | 15.5 |
| 40°F | 87.4 | 71.6 | 15.7 |
| 41°F | 89.1 | 73.2 | 15.9 |
| 42°F | 90.9 | 74.8 | 16.1 |
| 43°F | 92.7 | 76.5 | 16.3 |
| 44°F | 94.6 | 78.1 | 16.5 |
| 45°F | 96.4 | 79.8 | 16.7 |
| 46°F | 98.3 | 81.5 | 16.8 |
| 47°F | 100.2 | 83.2 | 17.0 |
| 48°F | 102.1 | 84.9 | 17.2 |
| 49°F | 104.1 | 86.7 | 17.4 |
| 50°F | 106.1 | 88.5 | 17.6 |
| 51°F | 108.1 | 90.3 | 17.8 |
| 52°F | 110.1 | 92.1 | 18.0 |
| 53°F | 112.1 | 94.0 | 18.2 |
| 54°F | 114.2 | 95.8 | 18.4 |
| 55°F | 116.3 | 97.8 | 18.6 |
| 56°F | 118.4 | 99.7 | 18.8 |
| 57°F | 120.6 | 101.6 | 19.0 |
| 58°F | 122.8 | 103.6 | 19.1 |
| 59°F | 125.0 | 105.6 | 19.3 |
| 60°F | 127.2 | 107.7 | 19.5 |
| 61°F | 129.4 | 109.7 | 19.7 |
| 62°F | 131.7 | 111.8 | 19.9 |
| 63°F | 134.0 | 113.9 | 20.1 |
| 64°F | 136.4 | 116.0 | 20.3 |
| 65°F | 138.7 | 118.2 | 20.5 |
| 66°F | 141.1 | 120.4 | 20.7 |
| 67°F | 143.5 | 122.6 | 20.9 |
| 68°F | 146.0 | 124.9 | 21.1 |
| 69°F | 148.5 | 127.1 | 21.3 |
| 70°F | 151.0 | 129.4 | 21.5 |
| 71°F | 153.5 | 131.8 | 21.7 |
| 72°F | 156.0 | 134.1 | 21.9 |
| 73°F | 158.6 | 136.5 | 22.1 |
| 74°F | 161.2 | 138.9 | 22.3 |
| 75°F | 163.9 | 141.4 | 22.5 |
| 76°F | 166.6 | 143.8 | 22.7 |
| 77°F | 169.3 | 146.4 | 22.9 |
| 78°F | 172.0 | 148.9 | 23.1 |
| 79°F | 174.8 | 151.5 | 23.3 |
| 80°F | 177.6 | 154.1 | 23.5 |
| 81°F | 180.4 | 156.7 | 23.7 |
| 82°F | 183.2 | 159.3 | 23.9 |
| 83°F | 186.1 | 162.0 | 24.1 |
| 84°F | 189.0 | 164.7 | 24.3 |
| 85°F | 192.0 | 167.5 | 24.5 |
| 86°F | 194.9 | 170.3 | 24.7 |
| 87°F | 197.9 | 173.1 | 24.9 |
| 88°F | 201.0 | 175.9 | 25.1 |
| 89°F | 204.1 | 178.8 | 25.3 |
| 90°F | 207.2 | 181.7 | 25.4 |
| 91°F | 210.3 | 184.7 | 25.6 |
| 92°F | 213.5 | 187.7 | 25.8 |
| 93°F | 216.7 | 190.7 | 26.0 |
| 94°F | 219.9 | 193.7 | 26.2 |
| 95°FAHRI design ambient | 223.2 | 196.8 | 26.4 |
| 96°F | 226.5 | 199.9 | 26.6 |
| 97°F | 229.8 | 203.1 | 26.8 |
| 98°F | 233.2 | 206.2 | 26.9 |
| 99°F | 236.6 | 209.5 | 27.1 |
| 100°F | 240.0 | 212.7 | 27.3 |
| 101°F | 243.5 | 216.0 | 27.5 |
| 102°F | 247.0 | 219.3 | 27.6 |
| 103°F | 250.5 | 222.7 | 27.8 |
| 104°F | 254.1 | 226.1 | 28.0 |
| 105°F | 257.7 | 229.6 | 28.2 |
| 106°F | 261.4 | 233.0 | 28.3 |
| 107°F | 265.0 | 236.6 | 28.5 |
| 108°F | 268.8 | 240.1 | 28.7 |
| 109°F | 272.5 | 243.7 | 28.8 |
| 110°FCond saturation | 276.3 | 247.3 | 29.0 |
| 111°F | 280.1 | 251.0 | 29.1 |
| 112°F | 284.0 | 254.7 | 29.3 |
| 113°F | 287.9 | 258.5 | 29.4 |
| 114°F | 291.8 | 262.3 | 29.6 |
| 115°F | 295.8 | 266.1 | 29.7 |
| 116°F | 299.8 | 270.0 | 29.9 |
| 117°F | 303.9 | 273.9 | 30.0 |
| 118°F | 308.0 | 277.8 | 30.1 |
| 119°F | 312.1 | 281.8 | 30.3 |
| 120°F | 316.3 | 285.9 | 30.4 |
| 121°F | 320.5 | 290.0 | 30.5 |
| 122°F | 324.7 | 294.1 | 30.6 |
| 123°F | 329.0 | 298.3 | 30.8 |
| 124°F | 333.3 | 302.5 | 30.9 |
| 125°F | 337.7 | 306.7 | 31.0 |
| 126°F | 342.1 | 311.0 | 31.1 |
| 127°F | 346.6 | 315.4 | 31.2 |
| 128°F | 351.0 | 319.8 | 31.3 |
| 129°F | 355.6 | 324.2 | 31.3 |
| 130°F | 360.1 | 328.7 | 31.4 |
| 131°F | 364.7 | 333.3 | 31.5 |
| 132°F | 369.4 | 337.8 | 31.6 |
| 133°F | 374.1 | 342.5 | 31.6 |
| 134°F | 378.8 | 347.1 | 31.7 |
| 135°F | 383.6 | 351.9 | 31.7 |
| 136°F | 388.4 | 356.7 | 31.8 |
| 137°F | 393.3 | 361.5 | 31.8 |
| 138°F | 398.2 | 366.4 | 31.8 |
| 139°F | 403.1 | 371.3 | 31.8 |
| 140°F | 408.1 | 376.3 | 31.8 |
| 141°F | 413.2 | 381.3 | 31.9 |
| 142°F | 418.3 | 386.4 | 31.8 |
| 143°F | 423.4 | 391.6 | 31.8 |
| 144°F | 428.6 | 396.8 | 31.8 |
| 145°F | 433.8 | 402.0 | 31.8 |
| 146°F | 439.1 | 407.3 | 31.7 |
| 147°F | 444.4 | 412.7 | 31.7 |
| 148°F | 449.7 | 418.1 | 31.6 |
| 149°F | 455.1 | 423.6 | 31.5 |
| 150°F | 460.6 | 429.2 | 31.4 |
| Temp (°C) | Bubble (kPa) | Dew (kPa) | Glide (kPa) |
|---|---|---|---|
| -40°C | 31 | -0 | 32 |
| -39°C | 37 | 5 | 33 |
| -38°C | 44 | 10 | 34 |
| -37°C | 50 | 15 | 35 |
| -36°C | 57 | 21 | 36 |
| -35°C | 64 | 27 | 38 |
| -34°C | 72 | 33 | 39 |
| -33°C | 79 | 39 | 40 |
| -32°C | 87 | 46 | 41 |
| -31°C | 95 | 52 | 43 |
| -30°C | 104 | 60 | 44 |
| -29°C | 112 | 67 | 46 |
| -28°C | 121 | 74 | 47 |
| -27°C | 130 | 82 | 49 |
| -26°C | 140 | 90 | 50 |
| -25°C | 150 | 98 | 52 |
| -24°C | 160 | 107 | 53 |
| -23°C | 170 | 116 | 55 |
| -22°C | 181 | 125 | 56 |
| -21°C | 192 | 134 | 58 |
| -20°C | 204 | 144 | 60 |
| -19°C | 215 | 154 | 61 |
| -18°C | 227 | 164 | 63 |
| -17°C | 240 | 175 | 65 |
| -16°C | 253 | 186 | 67 |
| -15°C | 266 | 197 | 68 |
| -14°C | 279 | 209 | 70 |
| -13°C | 293 | 221 | 72 |
| -12°C | 307 | 233 | 74 |
| -11°C | 322 | 246 | 76 |
| -10°C | 337 | 259 | 78 |
| -9°C | 352 | 273 | 80 |
| -8°C | 368 | 286 | 82 |
| -7°CMT evap target | 384 | 301 | 84 |
| -6°C | 401 | 315 | 86 |
| -5°C | 418 | 330 | 88 |
| -4°C | 436 | 346 | 90 |
| -3°C | 454 | 362 | 92 |
| -2°C | 472 | 378 | 94 |
| -1°C | 491 | 395 | 96 |
| 0°CH₂O freeze | 511 | 412 | 99 |
| 1°C | 530 | 430 | 101 |
| 2°CMT box temp | 551 | 448 | 103 |
| 3°C | 571 | 466 | 105 |
| 4°C | 593 | 485 | 107 |
| 5°C | 615 | 505 | 110 |
| 6°C | 637 | 525 | 112 |
| 7°C | 660 | 545 | 114 |
| 8°C | 683 | 566 | 117 |
| 9°C | 707 | 588 | 119 |
| 10°C | 731 | 610 | 121 |
| 11°C | 756 | 632 | 124 |
| 12°C | 782 | 656 | 126 |
| 13°C | 808 | 679 | 128 |
| 14°C | 834 | 704 | 131 |
| 15°C | 862 | 728 | 133 |
| 16°C | 889 | 754 | 136 |
| 17°C | 918 | 780 | 138 |
| 18°C | 947 | 806 | 141 |
| 19°C | 976 | 833 | 143 |
| 20°C | 1,007 | 861 | 146 |
| 21°C | 1,037 | 889 | 148 |
| 22°C | 1,069 | 918 | 151 |
| 23°C | 1,101 | 948 | 153 |
| 24°C | 1,134 | 978 | 155 |
| 25°C | 1,167 | 1,009 | 158 |
| 26°C | 1,201 | 1,041 | 160 |
| 27°C | 1,236 | 1,073 | 163 |
| 28°C | 1,271 | 1,106 | 165 |
| 29°C | 1,307 | 1,140 | 168 |
| 30°C | 1,344 | 1,174 | 170 |
| 31°C | 1,382 | 1,209 | 172 |
| 32°C | 1,420 | 1,245 | 175 |
| 33°C | 1,459 | 1,281 | 177 |
| 34°C | 1,498 | 1,319 | 180 |
| 35°CAHRI design ambient | 1,539 | 1,357 | 182 |
| 36°C | 1,580 | 1,396 | 184 |
| 37°C | 1,622 | 1,435 | 186 |
| 38°C | 1,664 | 1,476 | 189 |
| 39°C | 1,708 | 1,517 | 191 |
| 40°C | 1,752 | 1,559 | 193 |
| 41°C | 1,797 | 1,602 | 195 |
| 42°C | 1,843 | 1,646 | 197 |
| 43°CCond saturation | 1,889 | 1,690 | 199 |
| 44°C | 1,937 | 1,736 | 201 |
| 45°C | 1,985 | 1,782 | 203 |
| 46°C | 2,034 | 1,829 | 205 |
| 47°C | 2,084 | 1,877 | 206 |
| 48°C | 2,135 | 1,927 | 208 |
| 49°C | 2,186 | 1,977 | 210 |
| 50°C | 2,239 | 2,028 | 211 |
| 51°C | 2,292 | 2,080 | 213 |
| 52°C | 2,347 | 2,133 | 214 |
| 53°C | 2,402 | 2,187 | 215 |
| 54°C | 2,458 | 2,242 | 216 |
| 55°C | 2,515 | 2,298 | 217 |
| 56°C | 2,573 | 2,355 | 218 |
| 57°C | 2,632 | 2,413 | 219 |
| 58°C | 2,692 | 2,472 | 219 |
| 59°C | 2,752 | 2,533 | 220 |
| 60°C | 2,814 | 2,594 | 220 |
| 61°C | 2,877 | 2,657 | 220 |
| 62°C | 2,941 | 2,721 | 219 |
| 63°C | 3,005 | 2,787 | 219 |
| 64°C | 3,071 | 2,853 | 218 |
| 65°C | 3,138 | 2,921 | 217 |
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-449A PT chart data: CoolProp 7.2.0 (REFPROP-compatible Helmholtz EOS) or manufacturer datasheet, validated against AHRI Standard 700-2019.
At a glance
Chemistry
Lubricant compatibility
POE required. Lower-GWP R-404A replacement, similar capacity. Significant temperature glide.
Blend composition
- R-3224.3%
- R-12524.7%
- R-1234yf25.3%
- R-134a25.7%
Trade names
- Opteon XP40Chemours
Common applications
- Commercial refrigeration (medium/low temp)
- Supermarket display cases
- R-404A retrofit
Properties
- Boiling point (1 atm)-45.7°C / -50.3°F
- Critical pointNo single point — blend critical locus
- Molar mass87.21 g/mol
- Temperature glide9.5°F
- ODP0
- GWP (AR5, 100-yr)1397
- GWP (AR6, 100-yr)1430
What is R-449A?
R-449A is a quaternary blend of four components — R-32 (24.3%), R-125 (24.7%), R-134a (25.7%), and R-1234yf (25.3%) by mass [ashrae34]. The composition was engineered by Chemours as a drop-in retrofit for R-404A commercial refrigeration equipment, with the same engineering targets as Honeywell's competing R-448A: A1 safety, substantial GWP reduction, R-404A pressure-envelope match, POE oil compatibility.
R-449A's quaternary composition uses one fewer component than R-448A's quinary blend (R-449A omits the R-1234ze that R-448A includes). The two blends perform essentially equivalently in commercial refrigeration applications; the choice between them is typically driven by manufacturer relationship and equipment OEM specification.
Where R-449A is used
- R-404A retrofit for medium and low-temperature commercial refrigeration
- R-22 medium-temperature commercial refrigeration retrofit
- New equipment installations preferring A1 classification with reduced GWP
- Supermarket refrigeration retrofit where Chemours equipment supply chain is established
Regulatory & phase-down status
R-449A faces the same regulatory positioning as R-448A. GWP 1397 is substantially below R-404A's 3922 but above the EU F-Gas 150-GWP threshold for some commercial refrigeration categories [eufgas].
For existing R-404A installations through the late 2020s, R-449A remains a dominant A1 retrofit choice alongside R-448A. For new equipment requiring very-low GWP compliance, A2L alternatives (R-454C, R-455A at 148) or R-744 (CO₂, GWP 1) are required.
Service notes
POE oil required — same lubricant family as R-404A, so R-404A retrofit to R-449A typically does NOT require oil change [ahri700]. The 10°F temperature glide affects service measurement — use dew curve for superheat, bubble curve for subcooling.
R-449A operating pressures are slightly lower than R-404A across the range. A1 classification means no A2L-specific procedures required. Standard HFC service practice applies.
Temperature glide
R-449A is a zeotropic blend: at constant pressure it boils across a temperature range rather than at a single point. This affects EXV sizing, charge measurement, and superheat measurement. Use the dew curve for superheat, bubble curve for subcooling.
Operating cycle
Phase-down timeline
No phase-down milestones documented for R-449A in this build. This may mean: (a) no regulatory phase-down currently published; (b) the refrigerant has local regulatory schedules not yet transcribed into the site dataset; or (c) it is a specialty refrigerant outside the main regulatory frameworks. For authoritative current status, consult the EPA AIM Act allocations (40 CFR Part 84), EU F-Gas Regulation 517/2014 + 2024/573, and the relevant national implementations of the Kigali Amendment.
Global warming potential, in context
Commercial refrigeration — medium temperature
Retrofit and replacement paths
R-449A replaces
Replacements for R-449A
Reading the R-449A PT chart
R-449A is a zeotropic blend with ~10°F glide — the PT chart shows two curves (bubble and dew). For superheat measurement use the dew curve at suction pressure; for subcooling measurement use the bubble curve at discharge pressure.
The chart shape is similar to R-448A — both blends have nearly identical pressure envelopes and glide characteristics. Service measurement procedures are interchangeable between R-448A and R-449A.
R-448A and R-449A behave so similarly in service that field procedures can be standardized across both blends. The PT calculators on this site handle both correctly with dew/bubble curve auto-selection. Technicians familiar with either blend can work on the other without procedural retraining.
The 4-component R-449A composition vs 5-component R-448A
R-449A omits the R-1234ze(E) component that R-448A includes — both are quaternary or quinary HFC/HFO blends with similar GWP and identical safety class. The composition difference is engineering choice rather than meaningful performance differentiation.
R-449A component roles:
- R-32 (24.3%, GWP 675) — primary capacity contributor and pressure-envelope tuning
- R-125 (24.7%, GWP 3500) — flammability suppressor for A1 classification
- R-134a (25.7%, GWP 1430) — pressure tuning and capacity
- R-1234yf (25.3%, GWP 4) — primary GWP-diluting HFO
The mass-weighted GWP: 0.243 × 675 + 0.247 × 3500 + 0.257 × 1430 + 0.253 × 4 = 164 + 864 + 368 + 1 = 1397 [ipccar5]. R-125 is the GWP-heavy component but necessary for A1 flammability suppression — the same engineering trade-off as R-448A.
Pressure envelope nearly identical to R-448A and close to R-404A
R-449A's pressure envelope tracks R-448A within 1-2% across the operating range. At 70°F R-449A bubble is 140 PSIG vs R-448A's 138 PSIG (CoolProp 7.2.0). The pressure-envelope similarity reflects the similar composition strategy — both blends use ~25% R-32 + ~25% R-125 + ~25% R-134a + ~25% R-1234yf-class HFO as the operational backbone.
Both R-448A and R-449A are designed to closely match R-404A's pressure envelope across the commercial refrigeration operating range. Retrofit of R-404A equipment to either blend typically requires no compressor or expansion-valve replacement; the system can be retrofitted by refrigerant change alone.
The ~5% reduction below R-404A pressures is small enough to fall within R-404A equipment's normal operating tolerances. Standard 500-800 PSI manifold gauges handle the envelope without modification.
GWP 1397 — same ~65% reduction as R-448A
R-449A's GWP of 1397 is essentially equivalent to R-448A's 1387 (10-point difference, statistically meaningless for regulatory purposes). Both blends provide approximately 65% GWP reduction from R-404A's 3922 [ipccar5].
The reduction comes from the R-1234yf component (25.3% of R-449A by mass), which has GWP 4. Diluting the R-404A-class HFC majority with R-1234yf is the primary GWP-reduction mechanism in the entire R-448A/R-449A class of retrofit blends.
For regulatory compliance, R-449A faces the same constraints as R-448A. Both clear EPA AIM Act commercial refrigeration thresholds for most categories through the 2020s. Both fall above EU F-Gas 150-GWP threshold for the strictest categories. The long-term low-GWP destination remains A2L (R-454C, R-455A at 148) or R-744 (CO₂, GWP 1).
R-449A at commercial refrigeration service temperatures
R-449A saturation values across typical commercial refrigeration operating conditions (bubble / dew):
- −40°F (deep freezer) — bubble approximately 5 inHg vac / dew approximately 10 inHg vac.
- −20°F (frozen food) — bubble approximately 19 PSIG / dew approximately 14 PSIG.
- 0°F (freezer) — bubble approximately 42 PSIG / dew approximately 36 PSIG.
- 30°F (refrigerated case) — bubble approximately 76 PSIG / dew approximately 66 PSIG.
- 70°F (bench reference) — bubble 140 PSIG / dew 127 PSIG.
- 95°F (summer condensing) — bubble approximately 222 PSIG / dew approximately 202 PSIG.
For service measurement: dew curve for superheat, bubble curve for subcooling. Values within 1-2% of R-448A across the entire range.
Service procedures — identical to R-448A practice
R-449A service procedures are identical to R-448A practice — both blends have the same safety class (A1), the same lubricant family (POE), nearly identical pressure envelope, and the same ~10°F glide requiring dew/bubble curve selection. Technicians trained on either blend can work on the other.
| Equipment / procedure | R-449A | R-448A | | --- | --- | --- | | Manifold gauge rating | 500-800 PSI | 500-800 PSI (identical) | | Recovery cylinder | Standard 600 PSI | Standard 600 PSI (identical) | | Lubricant | POE | POE (identical family) | | Curve selection for superheat | Dew curve | Dew curve (identical) | | Curve selection for subcooling | Bubble curve | Bubble curve (identical) | | Charge by weight | Required | Required (identical) | | Safety class | A1 | A1 (identical) |
The retrofit procedure for either blend on R-404A equipment is also identical: recover R-404A, replace filter-drier, evacuate to 500 microns, recharge by weight to OEM nameplate. Capacity match within 5% of R-404A for both.
Chemours and Honeywell — competing on the same refrigerant niche
R-448A (Honeywell Solstice N40) and R-449A (Chemours Opteon XP40) are functionally equivalent refrigerants competing for the same R-404A retrofit market. The competition reflects the broader Chemours-vs-Honeywell rivalry in the global refrigerant supply industry.
Both companies offer extensive HFC and HFO refrigerant portfolios. Honeywell tends to favor proprietary blends with their Solstice branding (Solstice 454B for residential AC R-410A replacement; Solstice N40 for commercial refrigeration R-404A retrofit; Solstice zd for chiller R-123 retrofit). Chemours offers competing Opteon-branded alternatives (Opteon XL41 for R-410A replacement; Opteon XP40 for R-404A retrofit; Opteon XP10 for R-134a chiller retrofit).
For end-user operators, the brand choice is typically a function of distributor relationships and equipment OEM specifications. Performance is essentially equivalent between the competing brands; pricing varies by supply agreement; technical-support quality depends on the specific local distributor network.
How to think about R-449A in 2026 and beyond
R-449A occupies the R-404A retrofit niche alongside R-448A. For existing R-404A commercial refrigeration equipment with substantial remaining service life, R-449A provides ~65% GWP reduction with A1 safety preservation and POE oil compatibility.
The retrofit economics are favorable. The procedure is operationally simple, requires no equipment-level redesign, and preserves the existing lubricant. R-449A capacity matches R-404A within 5%; system efficiency is comparable; service technicians need only the dew/bubble curve discipline adjustment for the ~10°F glide.
The long-term trajectory is replacement with A2L (R-454C, R-455A at 148 GWP) or R-744 transcritical (GWP 1) for new equipment. R-449A bridges the gap for existing R-404A equipment through the 2020s; new equipment installations from 2026+ increasingly specify the low-GWP A2L alternatives.
For service technicians, R-449A work is operationally interchangeable with R-448A — same safety class, same lubricant, same pressure envelope, same glide handling. Field practice can be standardized across both blends.
Frequently asked
›What is the normal operating pressure of R-449A?
Slightly lower than R-404A. At 70°F R-449A saturation is approximately 140 PSIG bubble / 127 PSIG dew (CoolProp 7.2.0). Compare to R-404A at 70°F (148 PSIG, near-azeotropic).
For low-temperature commercial refrigeration at −20°F evaporator, R-449A saturation is approximately 14 PSIG dew. For medium-temp at 30°F evaporator, approximately 54 PSIG dew.
›What's the difference between R-448A and R-449A?
Both are A1 HFC/HFO blends marketed as R-404A retrofit refrigerants. R-448A (Honeywell Solstice N40) is quinary (5 components including R-1234ze). R-449A (Chemours Opteon XP40) is quaternary (4 components, no R-1234ze).
Performance is essentially equivalent — GWP 1387 vs 1397, both A1, both POE oil, both ~10°F glide, both ~5% below R-404A pressure across the range. The choice between them is typically driven by manufacturer brand preference and equipment OEM specification.
›Can I retrofit R-404A to R-449A without changing oil?
Yes — both refrigerants use POE oil. Standard retrofit procedure: recover R-404A, replace filter-drier, evacuate to 500 microns, recharge R-449A by weight to OEM nameplate amount.
Verify oil condition before retrofit. If POE is degraded (moisture, acidity, color change), replace as part of the retrofit. But oil family compatibility is preserved across R-404A → R-449A transition.
›What does R-449A's GWP of 1397 mean?
A 1 kg release of R-449A traps approximately 1,397 times more heat over 100 years than 1 kg of CO₂ (IPCC AR5, mass-weighted from the four components) [ipccar5]. The 1397 figure represents a ~65% reduction from R-404A's 3922.
The reduction is significant but not enough to clear EU F-Gas 150-GWP threshold for strictest commercial refrigeration categories. R-449A is a transitional refrigerant.
›How do I measure superheat on R-449A?
Use the dew temperature at suction pressure. R-449A's 10°F glide means using the bubble curve would understate superheat by approximately 10°F.
Modern PT calculators handle the dew/bubble selection automatically when R-449A is selected.
›What lubricant does R-449A use?
Polyolester (POE) oil — same lubricant family as R-404A and R-410A [ahri700]. Typical viscosity is ISO 32 for medium-temperature commercial refrigeration. POE oil compatibility is a primary retrofit advantage.
›Is R-449A safe to handle?
ASHRAE class A1 — non-toxic and non-flammable [ashrae34]. Standard HFC service procedures apply. No A2L-specific requirements.
›Which is better, R-448A or R-449A?
Neither is meaningfully better than the other for typical commercial refrigeration retrofit applications. R-448A has marginally lower GWP (1387 vs 1397) but the 10-point difference is not operationally significant. R-449A has slightly simpler composition (4 components vs 5) which marginally simplifies blend manufacturing.
Equipment OEM specification typically determines which one any installation uses. Honeywell-aligned OEMs lean toward R-448A; Chemours-aligned OEMs lean toward R-449A.
Sources & citations
- [1]ASHRAE Standard 34-2022 — Designation and Safety Classification of Refrigerants
- [2]IPCC AR5 (2014) Working Group I, Chapter 8, Table 8.A.1
- [3]EPA AIM Act — 40 CFR Part 84 Subpart BFinal Rule Oct 2021https://www.epa.gov/climate-hfcs-reduction
- [4]EU F-Gas Regulation 517/2014 (revised 2024)
- [5]EPA SNAP — R-449A acceptable for commercial refrigeration
- [6]CoolProp 7.2.0 (Bell, Wronski, Quoilin, Lemort 2014)
- [7]AHRI Standard 700-2019 — Specifications for Refrigerants
- [8]Chemours Opteon XP40 (R-449A) Product Data Sheet