If you’ve shopped for a new air conditioner recently, you’ve probably heard that R-410A is being phased out and replaced by refrigerants called R-454B and R-32. Here’s a plain-English explanation of what’s actually happening, what it means for your current system, and why you don’t need to panic.

What is happening to R-410A?

R-410A is a hydrofluorocarbon (HFC) refrigerant that has been the residential standard since it replaced R-22. It has zero ozone-depletion potential, but a high global warming potential (GWP) of about 2,088. Under the American Innovation and Manufacturing (AIM) Act of 2020, the EPA is phasing down HFC production, targeting an 85% reduction by 2036. As part of that, manufacturers stopped producing and importing new residential air conditioners and heat pumps using R-410A as of January 1, 2025.

Note this applies to new equipment. R-410A refrigerant itself remains available to service the millions of existing systems, though its price is rising as production quotas tighten.

What is replacing R-410A?

Two low-GWP refrigerants have become the industry replacements, both classified A2L (mildly flammable) and both well under the EPA’s 700-GWP threshold for new equipment:

• R-454B (GWP of about 466) is the dominant replacement in ducted residential systems. It’s a blend of roughly 69% R-32 and 31% R-1234yf, with operating pressures only about 2–5% higher than R-410A. It’s used by brands including Carrier, Trane, Rheem, Lennox, and Bosch.
• R-32 (GWP of about 675) is common in ductless mini-split systems and is used by Daikin, Mitsubishi, LG, and others.

Both deliver cooling capacity and efficiency comparable to R-410A. From a buyer’s standpoint, the choice between an R-454B and an R-32 system comes down more to which manufacturer you prefer than to which refrigerant is “better.”

Do I have to replace my R-410A system?

No. The AIM Act does not require you to remove or replace working R-410A equipment. Existing systems can be serviced, repaired, and recharged for the foreseeable future, and the EPA explicitly allows ongoing replacement of individual components in existing R-410A systems. What will change over time is the cost of R-410A refrigerant for repairs, which is expected to keep rising as supply contracts.

Can I retrofit my R-410A system to use R-454B or R-32?

No. R-454B and R-32 are not drop-in replacements. They use different lubricants, run at different operating conditions, and are A2L-classified, which requires equipment specifically designed and safety-certified for them — including spark-proof components and integrated leak-detection sensors. Attempting a retrofit will void warranties, likely damage the compressor, and create safety hazards. When the time comes, the correct path is a properly designed new system, not a refrigerant swap.

Are A2L refrigerants safe?

“Mildly flammable” sounds alarming, but in practical terms A2L refrigerants require both a high concentration and a strong ignition source to combust. New systems built around R-454B and R-32 include integrated leak-detection sensors that shut the system down automatically if refrigerant accumulates indoors. Properly installed by a trained technician and built to current ASHRAE 15 standards, A2L systems are considered safe for residential use, and you won’t notice any difference in how the system operates.

Should I buy a new AC now or wait?

There’s no universal answer. If your current system is running well, there’s no rush. If it’s more than 12–15 years old and facing costly repairs — especially anything involving a compressor or a refrigerant leak — replacement with a new A2L system is worth serious consideration, since repair costs on aging R-410A equipment only climb as refrigerant prices rise. New A2L systems currently carry a modest price premium over the legacy R-410A units they replace.

Servicing R-410A and A2L systems

For HVAC professionals servicing these systems, we stock the gauges, vacuum pumps, and hoses required to do the job correctly, including the Mastercool R-22/R-404A/R-410A manifold gauge set and manifold-and-vacuum-pump combos. To understand the refrigerant that R-410A itself replaced, see our R-22 replacement guide. Questions? Email support@refrigerants4u.com.