R-410A vs R-454B
R-410A
R-454B
Key Differences
R-454B is the drop-in-pressure successor to R-410A for new equipment, not for retrofits. Existing R-410A systems cannot be converted because R-454B is A2L and needs equipment listed for it. In the field the practical differences are slightly lower pressures, a small (2–3°F) glide, A2L-rated tools, and using the dew column for superheat.
Pressure at common saturation temperatures: Blend pressures are liquid (bubble) values; see each refrigerant's page for vapor (dew) pressures.
- 0°F: R-410A 48.4 PSIG vs R-454B 45.3 PSIG (−3.1 PSI, −5% absolute)
- 40°F: R-410A 118.8 PSIG vs R-454B 112.0 PSIG (−6.8 PSI, −5% absolute)
- 70°F: R-410A 201.7 PSIG vs R-454B 190.5 PSIG (−11.2 PSI, −5% absolute)
- 100°F: R-410A 318.5 PSIG vs R-454B 300.8 PSIG (−17.7 PSI, −5% absolute)
- 120°F: R-410A 419.5 PSIG vs R-454B 395.7 PSIG (−23.8 PSI, −5% absolute)
Pressure Comparison Graph
Side-by-Side Pressures (PSIG)
| Temp | R-410A | R-454B | Δ PSIG |
|---|---|---|---|
| -80°F | -6.5 | -6.8 | -0.3 |
| -75°F | -5.1 | -5.5 | -0.4 |
| -70°F | -3.5 | -4.0 | -0.5 |
| -65°F | -1.7 | -2.3 | -0.6 |
| -60°F | 0.2 | -0.4 | -0.6 |
| -55°F | 2.5 | 1.7 | -0.8 |
| -50°F | 5.0 | 4.0 | -1.0 |
| -45°F | 7.7 | 6.6 | -1.1 |
| -40°F | 10.8 | 9.5 | -1.3 |
| -35°F | 14.1 | 12.7 | -1.4 |
| -30°F | 17.8 | 16.2 | -1.6 |
| -25°F | 21.9 | 20.1 | -1.8 |
| -20°F | 26.3 | 24.3 | -2.0 |
| -15°F | 31.2 | 28.9 | -2.3 |
| -10°F | 36.5 | 33.9 | -2.6 |
| -5°F | 42.2 | 39.4 | -2.8 |
| 0°F | 48.4 | 45.3 | -3.1 |
| 5°F | 55.2 | 51.7 | -3.5 |
| 10°F | 62.4 | 58.5 | -3.9 |
| 15°F | 70.3 | 66.0 | -4.3 |
| 20°F | 78.7 | 73.9 | -4.8 |
| 25°F | 87.7 | 82.5 | -5.2 |
| 30°F | 97.4 | 91.7 | -5.7 |
| 35°F | 107.7 | 101.5 | -6.2 |
| 40°F | 118.8 | 112.0 | -6.8 |
| 45°F | 130.6 | 123.1 | -7.5 |
| 50°F | 143.1 | 135.0 | -8.1 |
| 55°F | 156.5 | 147.7 | -8.8 |
| 60°F | 170.7 | 161.1 | -9.6 |
| 65°F | 185.8 | 175.4 | -10.4 |
| 70°F | 201.7 | 190.5 | -11.2 |
| 75°F | 218.6 | 206.5 | -12.1 |
| 80°F | 236.5 | 223.4 | -13.1 |
| 85°F | 255.4 | 241.2 | -14.2 |
| 90°F | 275.3 | 260.0 | -15.3 |
| 95°F | 296.4 | 279.9 | -16.5 |
| 100°F | 318.5 | 300.8 | -17.7 |
| 105°F | 341.9 | 322.8 | -19.1 |
| 110°F | 366.5 | 345.9 | -20.6 |
| 115°F | 392.3 | 370.2 | -22.1 |
| 120°F | 419.5 | 395.7 | -23.8 |
| 125°F | 448.0 | 422.4 | -25.6 |
| 130°F | 478.0 | 450.5 | -27.5 |
| 155°F | 652.3 | 612.2 | -40.1 |
Frequently Asked Questions
What is the pressure difference between R-410A and R-454B?
At 70°F, R-410A = 201.7 PSIG and R-454B = 190.5 PSIG — a difference of about 11 PSIG. At higher temperatures (100°F), R-410A = 318.5 PSIG vs R-454B = 300.8 PSIG. Operating pressures are similar enough that R-410A manifolds can typically be used for R-454B service.
Can R-454B equipment be serviced with R-410A manifold gauges?
Yes, R-410A high-pressure manifold gauges (rated to 800 PSIG or higher) are generally safe for R-454B, since operating pressures are similar. However, hoses must be compatible with R-454B's A2L classification and the refrigerant's oil requirements.
Why is R-454B replacing R-410A?
R-454B has a GWP of 467 versus R-410A's 2088 — a 78% reduction. The EPA AIM Act mandates that all new US residential AC and heat pump equipment use low-GWP refrigerants after January 1, 2025. R-454B (and R-32) meet this requirement while having similar operating characteristics to R-410A.