R410A vs R454B: What Every HVAC Contractor Needs to Know in 2026

The HVAC industry is in the middle of its most significant refrigerant shift in decades. If you’re still running R410A systems day-to-day, you already know change is coming — and if you haven’t started preparing, 2026 is the year to get ahead of it. This guide breaks down exactly what’s changing, what R454B brings to the table, and what it means for your business.

Why R410A Is Being Phased Out

The phase-out of R410A is driven by the EPA’s refrigerant transition program under the American Innovation and Manufacturing (AIM) Act. The core issue is Global Warming Potential (GWP): R410A has a GWP of 2,088 — meaning it traps over 2,000 times more heat than CO₂ when released into the atmosphere.

As of January 1, 2025, the EPA banned the production and import of R410A for use in new equipment. This doesn’t mean existing R410A systems are illegal — they can still be serviced with reclaimed or recovered refrigerant — but no new equipment can be manufactured or sold in the U.S. using R410A. New residential and light commercial systems must now use a lower-GWP alternative, with R454B emerging as the dominant replacement chosen by major OEMs.

For contractors, this means any new split system, heat pump, or packaged unit you install starting in 2025 and beyond will almost certainly use R454B. Understanding how it differs from R410A — and what new handling protocols it requires — is now essential job knowledge.

What Is R454B?

R454B (sold under the trade name Opteon™ XL41 by Chemours) is a hydrofluoroolefin (HFO) blend designed as a near drop-in replacement for R410A in new equipment. Here’s what you need to know about its core properties:

• GWP of 466 — roughly 78% lower than R410A’s 2,088, meeting the AIM Act’s targets for low-GWP refrigerants.
• A2L classification — the ASHRAE safety group A2L means R454B is mildly flammable. It has a very low burning velocity and requires an ignition source to combust, but it is not in the same non-flammable category as R410A (A1).
• Similar operating pressures to R410A — R454B operates at pressures close to R410A, which is why equipment manufacturers could redesign systems around it without completely rearchitecting refrigerant circuits.
• Slightly lower capacity — R454B systems are typically optimized at the OEM level to deliver equivalent or improved efficiency compared to R410A, even though the raw refrigerant properties differ slightly.
• Not a retrofit refrigerant — R454B is engineered for new systems built to accommodate its A2L properties. It cannot be used to retrofit existing R410A equipment.

For a deeper technical breakdown, see our R454B refrigerant guide.

R410A vs R454B: Side-by-Side Comparison

Here’s how the two refrigerants stack up across the metrics that matter most to contractors:

Equipment Compatibility: What Systems Use R454B?

The major OEMs moved quickly to transition their product lines to R454B. As of 2025–2026, new residential and light commercial systems from the following manufacturers use R454B:

• Carrier — The Carrier Comfort, Performance, and Infinity series all now ship with R454B in new production runs.
• Trane / RunTru — Trane’s residential split systems and RunTru by Trane (the contractor-channel line) have transitioned to R454B across their standard and high-efficiency models.
• Lennox — Lennox Merit, Elite, and Dave Lennox Signature series units for new installations are built for R454B.
• Daikin and others — Daikin, Rheem, York, and Goodman have also rolled out R454B-compatible lines across their residential portfolios.

Cedars HVAC stocks R454B-compatible systems from multiple manufacturers, including 2-ton AC condensers and mini split systems ready for today’s jobs. Every unit we carry is built to current SEER2 efficiency standards and A2L refrigerant handling requirements.

When ordering new equipment, always verify the unit’s refrigerant designation on the nameplate or spec sheet. R454B systems are clearly labeled and come with manufacturer documentation covering A2L installation requirements.

What Happens to Your Existing R410A Equipment?

If you have customers with R410A systems installed before 2025, here’s the bottom line: those systems are still fully serviceable. The EPA production ban applies to new manufacturing, not to servicing existing equipment.

You can continue to service R410A systems using reclaimed or recovered R410A refrigerant. Recovery, recycling, and reclamation of R410A remain legal and are the expected path forward for maintaining existing equipment. The supply of reclaimed R410A will persist for years, though prices may increase as virgin production winds down.

What you cannot do is retrofit an R410A system to use R454B. The refrigerants are chemically different, and R410A equipment was not designed or certified for A2L refrigerants. Attempting a refrigerant swap in an existing R410A system is unsafe and violates EPA regulations. If a system needs a refrigerant change, the correct path is equipment replacement.

For a full overview of R410A servicing options and system availability, see our page on R410A refrigerant and systems.

Safety and Handling: What Changes for Technicians

The switch from A1 to A2L classification is the most operationally significant change for technicians. R454B is not dangerous in the way that propane or R-290 is, but it does require specific procedures that weren’t necessary with R410A.

Key changes for A2L refrigerant handling:

• A2L-rated tools and equipment — Manifold gauges, recovery machines, and leak detectors must be rated for A2L refrigerants. Check with your tool manufacturer before using R410A equipment on R454B systems.
• Leak detectors — Use a heated-diode or infrared leak detector rated for HFO/HFC blends. Not all R410A leak detectors are sensitive to R454B.
• No open flames near refrigerant — While R454B has a very low burning velocity, open flames, sparks, and ignition sources should be kept away from work areas where refrigerant may be present. This includes brazing — follow manufacturer guidance on nitrogen purging and ventilation.
• Ventilation — Work in well-ventilated areas or use forced ventilation when working in enclosed spaces with R454B systems. In confined equipment rooms, R454B concentrations can reach ignitable levels if a large leak occurs.
• Refrigerant cylinders — R454B cylinders are color-coded (light green/mint) per AHRI standards. Store and transport them according to DOT regulations for flammable materials.
• Training — AHRI and ACCA both offer A2L training programs. Many manufacturers now require documented A2L training for warranty coverage on R454B equipment.

The core message: R454B is manageable and safe when handled with the right tools and procedures. The additional precautions are straightforward, and most seasoned technicians adapt quickly after their first few R454B installs.

Where to Buy R454B-Compatible Systems

Cedars HVAC is your direct source for R454B-compatible HVAC equipment, shipping free on every order nationwide. Our inventory includes split systems, mini splits, heat pumps, and packaged units from leading brands — all built for current efficiency standards and A2L refrigerant requirements.

Whether you’re replacing an aging R410A system for a residential customer or stocking up for a commercial project, Cedars HVAC has the equipment ready to ship. Browse our full selection of 2-ton AC condensers, mini split systems, and complete HVAC equipment at cedarshvac.com.

Frequently Asked Questions

Can I retrofit R410A equipment to use R454B?

No. R410A equipment is not designed or certified for A2L refrigerants like R454B. A retrofit is not possible — the system would need to be replaced with new equipment built and rated for R454B.

Is R454B more expensive than R410A?

New R454B equipment is priced comparably to what R410A systems cost at their peak. The refrigerant itself (R454B) currently costs more per pound than legacy R410A, but this gap is expected to narrow as production scales. For new installs, the main cost driver is the equipment, not the refrigerant.

What tools do I need for R454B?

You’ll need A2L-rated manifold gauges or digital gauge sets, an A2L-compatible recovery machine, and a leak detector rated for HFO refrigerant blends. Always verify tool compatibility with your manufacturer before working on R454B systems.

When did R410A production stop?

The EPA banned the production and import of R410A for use in new equipment effective January 1, 2025, under the AIM Act. R410A may still be used to service existing equipment using reclaimed or previously recovered refrigerant.