2026 EPA Compliance
R-410A vs R-454B 2026 Low-GWP Refrigerant Transition Guide
Everything homeowners and contractors need to know about EPA AIM Act regulations, low-GWP refrigerants, and equipment compatibility.
Summary of 2026 EPA Mandates
- AIM Act Mandate: Effective January 1, 2025/2026, all newly manufactured residential AC and heat pump systems must utilize refrigerants with a Global Warming Potential (GWP) under 700.
- R-454B (Opteon XL41): The primary low-GWP replacement for R-410A in residential HVAC, offering a 78% reduction in GWP rating (466 vs 2,088).
- Existing R-410A Systems: Homeowners with existing R-410A systems can continue operating and servicing them without penalty. R-410A refrigerant remain available for field service.
Refrigerant Spec Comparison
| Property |
Legacy R-410A |
New R-454B (Low-GWP) |
| Global Warming Potential (GWP) | 2,088 (High GWP) | 466 (78% Lower) |
| ASHRAE Safety Classification | A1 (Non-Flammable) | A2L (Mildly Flammable) |
| Operating Pressure | High Pressure | Similar to R-410A |
| 2026 EPA Legal Manufacturing Status | Phase-Out Active | 100% EPA Compliant |