Refrigerant Guide
R-454B — EPA Regulations, Phase-Out Schedule & Alternatives
Last updated: April 2026
Researched by the RefrigerantTrack Research Team
Overview
Full Name
Opteon XL41 (R-454B)
Global Warming Potential (GWP)
466
Ozone Depletion Potential (ODP)
0
Ozone Depleting Substance
No
Phase-Out Status
Active
Phase-Out Status
Currently active — no phase-out date set.
R-454B is not subject to an immediate phase-out or phase-down. It is approved for use in new equipment and is considered a lower-GWP option relative to the refrigerants it replaces. EPA Section 608 leak rate requirements still apply to all systems with a charge at or above the applicable threshold.
Key Regulatory Facts
These facts are drawn from EPA regulations, the AIM Act, and Montreal Protocol obligations. Each is a standalone verifiable statement.
R-454B (Opteon XL41) has a Global Warming Potential (GWP) of 466 — approximately 78% lower than R-410A's GWP of 2,088 — making it the primary low-GWP replacement refrigerant selected by most major residential HVAC manufacturers.
R-454B is classified as A2L (mildly flammable) by ASHRAE and is required to be used with A2L-listed equipment compliant with UL 60335-2-40 and ASHRAE Standard 15.
Major HVAC manufacturers including Carrier, Trane, Lennox, and Daikin began transitioning residential product lines to R-454B ahead of the EPA's January 1, 2025, new-equipment deadline under the AIM Act.
EPA Section 608 Requirements
Systems containing 15 lbs or more of R-454B are subject to the following EPA requirements.
| Requirement | Value |
|---|---|
| Appliance charge threshold (leak tracking required at or above) | 15 lbs |
| Max annual leak rate — commercial refrigeration | 15% |
| Max annual leak rate — comfort cooling | 30% |
Thresholds reflect the January 1, 2026, EPA Section 608 rule change reducing the appliance charge threshold from 50 lbs to 15 lbs.
Alternatives to R-454B
The following refrigerants are recognized EPA SNAP alternatives or successor refrigerants for R-454B applications. Always consult a certified HVAC technician before switching refrigerants.
Common Uses
- New residential air conditioners and heat pumps (replacing R-410A post-2025)
- New light commercial HVAC equipment
- Packaged rooftop units (new equipment)
- Split-system air conditioners and heat pumps
Frequently Asked Questions
Can R-454B be used to retrofit an existing R-410A system?
Generally no. R-454B is not a direct drop-in for R-410A without equipment modifications. It operates at slightly different pressures and requires A2L-rated components, including A2L-compatible leak detectors, wiring, and sometimes compressors. Retrofit kits are being developed by some manufacturers, but for most existing R-410A systems, replacement with new A2L-compliant equipment is the practical path when the unit reaches end of life.
Is R-454B the same as Puron Advance?
Yes. Carrier markets R-454B under the brand name Puron Advance. Chemours markets it as Opteon XL41. These are trade names for the same refrigerant blend (R-32/R-1234yf). Regardless of the brand name on the cylinder, verify the ASHRAE designation on the label — it should read R-454B.
Track your R-454B systems automatically
RefrigerantTrack monitors your leak rates, generates EPA-ready records, and alerts you before deadlines. Free for up to 5 systems.
Start Free — No Credit CardOr try the free leak rate calculator without an account.