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R-454B Pressure Temperature Chart
Interactive PT chart for R-454B (Puron Advance, Opteon XL41). The primary R-410A replacement in new U.S. residential AC equipment starting 2025. A2L mildly flammable — similar pressures to R-410A but slightly lower.
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R-454B Saturation Data
20 data points| Temperature | Pressure (psig) |
|---|---|
| -40°F | 6.5 |
| -30°F | 12 |
| -20°F | 19 |
| -10°F | 27.5 |
| 0°F | 37.8 |
| 10°F | 50.2 |
| 20°F | 64.8 |
| 30°F | 82 |
| 40°F | 102 |
| 50°F | 125 |
| 60°F | 151.5 |
| 70°F | 181.8 |
| 80°F | 216.2 |
| 90°F | 255 |
| 100°F | 298.5 |
| 110°F | 347.2 |
| 120°F | 401.5 |
| 130°F | 462 |
| 140°F | 529.5 |
| 150°F | 604.5 |
Source: ASHRAE Fundamentals. Pressures are gauge (psig) at sea level. Negative values indicate vacuum conditions.
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R-454B vs. R-410A Pressure Comparison
R-454B (trade names: Puron Advance, Opteon XL41) is a blend of R-32 and R-1234yf designed specifically to replace R-410A in new residential and light commercial HVAC equipment. It has similar but slightly lower pressures than R-410A.
| Temperature | R-454B (psig) | R-410A (psig) |
|---|---|---|
| 0°F / -18°C | 44 | 48 |
| 20°F / -7°C | 68 | 75 |
| 40°F / 4°C | 107 | 115 |
| 70°F / 21°C | 181 | 195 |
| 100°F / 38°C | 286 | 307 |
| 110°F / 43°C | 345 | 376 |
Approximate values. Use the interactive tool above for precise readings. Source: ASHRAE Fundamentals and manufacturer data.
Key Facts About R-454B
R-454B has a Global Warming Potential (GWP) of 466 — a 78% reduction compared to R-410A at 2,088. It meets the AIM Act requirement for new residential HVAC equipment to use refrigerants below GWP 700.
R-454B became the required refrigerant for new U.S. residential and light commercial AC and heat pump equipment starting January 1, 2025 under EPA AIM Act regulations.
At 40°F, R-454B saturates at approximately 107 psig — about 7% lower than R-410A (115 psig) at the same temperature, so existing R-410A manifold gauges are generally compatible.
R-454B is classified A2L (mildly flammable). New equipment designed for R-454B must comply with UL 60335-2-40 safety standards, which include built-in leak detection and ventilation requirements.
R-454B has a temperature glide of approximately 1.4°F — slightly more than R-410A. Technicians should charge from the liquid phase and use R-454B-specific superheat and subcooling targets provided by the equipment manufacturer.
R-454B PT Chart — Frequently Asked Questions
What are the normal operating pressures for R-454B?
R-454B saturation pressures are close to R-410A but slightly lower. At 40°F, R-454B saturates at approximately 107 psig versus R-410A at 115 psig. At 110°F (condenser), R-454B is approximately 345 psig versus R-410A at 376 psig. The pressure difference is small enough that most R-410A service tools work on R-454B systems, though refrigerant-specific charging tables should always be used.
What is R-454B sold as?
R-454B is sold under the trade names Puron Advance (Carrier/Bryant) and Opteon XL41 (Chemours). It is a blend of R-32 (68.9%) and R-1234yf (31.1%). The GWP of R-454B is 466 — about 78% lower than R-410A at 2,088. It is the refrigerant used in Carrier, Bryant, and many other major HVAC brand new residential equipment starting with 2025 model year equipment.
Is R-454B a drop-in replacement for R-410A?
No. R-454B is not a drop-in for R-410A. It requires equipment specifically designed for it. R-454B is A2L mildly flammable, whereas R-410A is A1 (non-flammable). New equipment must be designed to A2L safety standards. You cannot add R-454B to an existing R-410A system. Existing R-410A systems must continue to use R-410A (reclaimed) for service.
Is R-454B flammable?
R-454B is classified as A2L — mildly flammable. Like R-32, it requires a narrow concentration range and high ignition energy to ignite. It burns slowly. The A2L classification requires specific safety protocols: adequate ventilation when working in enclosed spaces, no open ignition sources, and A2L-rated recovery equipment. Most new R-454B equipment includes built-in A2L leak detection and ventilation as a UL 60335-2-40 requirement.
When did equipment switch to R-454B?
Under the AIM Act, EPA regulations require that new residential and light commercial AC and heat pump systems use refrigerants with GWP below 700 starting January 1, 2025. Most major U.S. HVAC manufacturers — Carrier, Trane, Lennox, Rheem, Goodman — began shipping R-454B equipment for the 2025 installation season. This represents one of the largest transitions in U.S. HVAC history since the R-22 to R-410A shift in the 2000s.
Manage your R-454B transition
As your fleet transitions from R-410A to R-454B, RefrigerantTrack keeps refrigerant logs separate by system, tracks EPA compliance, and documents your usage automatically. Free for up to 5 systems.
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Researched by the RefrigerantTrack Research Team