Home › AC Refrigerant › R-410A vs R-454B
If you are buying a new system, you are buying R-454B or R-32 — that decision was made for you by the manufacturing rule. This page is about what the difference actually amounts to.
| R-410A | R-454B | |
|---|---|---|
| GWP | 2,088 | 466 |
| Safety class | A1 — non-flammable | A2L — mildly flammable |
| Composition | 50% HFC-32 / 50% HFC-125 by weight | 68.9% HFC-32 / 31.1% R-1234yf by weight |
| In new equipment | No (since Jan 1 2025) | Yes |
| Operating pressure | Baseline | Close to R-410A |
Why manufacturers picked R-454B
Two reasons. Its GWP of 466 is comfortably under the 700 limit — and lower than R-32’s 675. And its operating pressures sit close enough to R-410A that manufacturers could carry over a great deal of existing engineering rather than redesigning around a refrigerant that behaves differently.
That similarity is an engineering convenience, not a compatibility statement. R-454B still cannot go into an R-410A system.
What actually changes for you
Cooling performance: nothing noticeable. A properly sized R-454B system cools your house the same as a properly sized R-410A one.
Service: a transitional wrinkle. A2L refrigerants need rated recovery equipment and trained technicians. Not every shop is equipped yet, so it is worth confirming when you book service on a new system. This resolves as the transition matures.
Cost: modestly higher for now. Newer supply chain, less settled pricing. Expect it to normalise.
Is this a reason to replace your R-410A system?
No. R-410A is being phased down, not banned. Your system stays legal to own, service, and recharge, and refrigerant continues to be produced for servicing existing equipment. EPA even removed the installation deadline for pre-2025 R-410A equipment in May 2026.
Replace when age, repair cost, and efficiency justify it. Run those numbers here.
Related: R-410A · R-454B · R-32 · New system decision guide
Frequently asked questions
Is R-454B better than R-410A?
Environmentally yes — GWP 466 against about 2,088. For cooling your house, you should notice no difference. It is not a reason to replace a working R-410A system.
Do I need a new AC because of R-454B?
No. R-410A systems remain legal to own, service, and recharge. The rule restricts what manufacturers may build, not what you may keep.
Is R-454B more expensive to service?
Modestly, for now. It is a newer supply chain and A2L handling requires rated recovery equipment, so not every shop is set up for it yet. Expect this to settle as the transition matures.
Sources & verification
✓ Verified against a manufacturer, regulator, or standards source
- EPA, “Technology Transitions HFC Restrictions by Sector” — epa.gov
- GWP values computed from the component exchange values in Appendix A to 40 CFR Part 84, the AIM Act regulated-substance list, rather than copied from secondary sources — epa.gov
⚠ Provisional — market-survey estimate, not a manufacturer or regulator citation
- Cost ranges are aggregated from HVAC cost-guide market surveys, collected 2026-08-31. They are not manufacturer or regulator figures, and regional pricing varies widely.
Last reviewed 2026-08-31. How we verify what we publish →
