R-454B Refrigerant Is Replacing R-410A in 2026: What Westchester Homeowners Need to Know Before Replacing an AC

If your air conditioner is more than ten years old and starting to act up, 2026 is a year you actually need to pay attention to what's inside it. The refrigerant industry is in the middle of a major transition, and the decision you make about repair versus replacement this season will affect your home for the next 15 to 20 years.

Here is what is changing, and what it means if you live in Dobbs Ferry, Hastings-on-Hudson, Tarrytown, or anywhere else in Westchester County.

R-410A is being phased out

R-410A has been the standard residential refrigerant in the United States since 2020, when the EPA pushed manufacturers off the older R-22 standard. R-410A was an improvement over R-22 because it does not damage the ozone layer, but it has a very high global warming potential, about 2,088 times that of carbon dioxide.

Under the EPA's AIM Act, R-410A is now being phased down. Starting January 1, 2026, new residential air conditioners and heat pumps sold in the United States can no longer use R-410A. Existing systems are not illegal, and the refrigerant will still be available for service and recharge for many years. But you cannot purchase a new R-410A air conditioner in 2026.

R-454B is the new residential standard

The refrigerant replacing R-410A in most new equipment is R-454B, sometimes branded as Opteon XL41 or Puron Advance. Its global warming potential is about 466, roughly 78% lower than R-410A. It is what is called a mildly flammable A2L refrigerant, which has changed how technicians install and service it, but in normal operation it behaves much like R-410A.

What this means if your A/C is showing its age

Three scenarios cover most Westchester homes right now.

Scenario 1: Your existing R-22 unit (15+ years old) finally died

If you are still running an R-22 system, the writing has been on the wall for years. The right move is full replacement with an R-454B system, which gets you 15 to 20 years of code-compliant operation and significantly lower energy bills.

Scenario 2: Your R-410A unit is 8 to 12 years old

This is the harder call. R-410A systems will be serviceable for many years to come, and a well-maintained 10-year-old unit can run another 5 to 7 years with normal care.

Scenario 3: Your R-410A unit is brand new (under 5 years old)

You are fine. Service it normally, keep it well-maintained, and revisit when it reaches end-of-life.

What Plitnick recommends

We are a Mitsubishi Electric Diamond Contractor, certified on the full Mitsubishi product line including the new R-454B Hyper Heat systems. We have retrained our entire service team on A2L refrigerant handling for R-454B.

Air conditioning service in Westchester County has been our family business since 1977. We have walked customers through three refrigerant transitions before this one (CFC-12 in the early 1990s, R-22 in 2020, and now R-410A). We can help you figure out the right move for your specific home.

Call us at the number on this page, or use the contact form. We serve Dobbs Ferry, Hastings-on-Hudson, Irvington, Tarrytown, Yonkers, White Plains, Ardsley, Bronxville, and the surrounding Hudson River villages.