What are R-454B and R-32, and what does the refrigerant change mean for my AC?
R-454B and R-32 are the refrigerants in most new central air conditioners and heat pumps, replacing R-410A under EPA's AIM Act rules. Both are mildly flammable (class A2L). Your existing R-410A system can still be repaired and recharged, but refrigerants can't be mixed and a new outdoor unit needs a coil built for its refrigerant.
Key points
- EPA's Technology Transitions rule caps new home AC and heat pump refrigerants at a GWP of 700 from January 1, 2025. R-410A is above that; R-454B (470) and R-32 (675) are under it.
- Both new refrigerants are A2L: lower flammability, slow to burn, and built into equipment designed for them.
- Existing R-410A systems can still be repaired and recharged. EPA says components used to repair existing systems aren't restricted.
- On May 21, 2026, EPA removed the January 1, 2026 install deadline for pre-2025 R-410A equipment.
- Never mix refrigerants. A new R-454B or R-32 condenser needs an indoor coil rated for it.
R-454B and R-32 are the refrigerants inside most new central air conditioners and heat pumps, replacing R-410A because EPA now limits how much a home system's refrigerant can warm the climate. For you, the change mostly matters when you buy new equipment: your current R-410A system can still be repaired and recharged, but you can't mix refrigerants, and a new outdoor unit has to be paired with an indoor coil built for its refrigerant.
Why did new air conditioners switch refrigerants?
The rule comes from the American Innovation and Manufacturing (AIM) Act, which directs EPA to phase down HFC refrigerants. Under EPA's 2023 Technology Transitions rule, residential and light-commercial air conditioning and heat pump systems face a global warming potential (GWP) limit of 700, starting January 1, 2025. R-410A sits well above that limit. The refrigerants manufacturers switched to sit under it.
| Refrigerant | Where you'll see it | GWP (EPA listing) | Safety class |
|---|---|---|---|
| R-410A | Most central systems installed before the switch | Above the 700 limit | Nonflammable |
| R-454B | New central systems from several major brands | 470 | A2L |
| R-32 | New central and ductless systems from other major brands | 675 | A2L |
The GWP numbers and A2L classes come from EPA's SNAP listing for residential and light-commercial AC and heat pumps. Which brand uses which refrigerant is the manufacturer's choice; our central AC brand guide goes model by model.
The dates moved once already. EPA first let pre-2025 R-410A equipment be installed until January 1, 2026. Then on May 21, 2026, EPA finalized a rule that removes that installation deadline for residential and light-commercial systems made or imported before January 1, 2025, and allows that inventory to be installed until supply runs out. You can read the current status on EPA's Technology Transitions page.
What does "A2L" mean on a refrigerant?
Refrigerants carry a two-part safety class. The letter is toxicity (A is the lower-toxicity group). The number is flammability. R-410A is nonflammable. R-454B and R-32 are "2L": they can burn under the right conditions, but they're hard to ignite and the flame spreads slowly. EPA calls them lower-flammability refrigerants.
EPA accepts both for home systems with use conditions attached. Its listings require equipment to meet the UL 60335-2-40 safety standard, keep refrigerant charge within that standard's limits, and carry flammable-refrigerant warning labels. Many new indoor units and furnaces also carry a refrigerant leak sensor, depending on the design. None of this changes how you use the system day to day. It changes how equipment is built, labeled and installed, and it's one more reason refrigerant work belongs with an EPA 608-certified technician (ours are).
Do you have to replace a working R-410A air conditioner?
Nothing in the rule forces you to replace a working R-410A air conditioner. EPA states that components used to repair existing systems are not subject to the restrictions. A failed capacitor, contactor, fan motor or even a compressor on an R-410A system can still be replaced, and the system can be recharged with R-410A after the leak is fixed.
What does get more expensive over time is the refrigerant itself, as production is phased down. National cost guides put R-410A at $50–$80 per pound installed and a typical recharge at $100–$320, per HomeGuide. A system only runs low when it leaks, so the money goes further when the leak is found and fixed first. Our refrigerant recharge cost post walks through that bill. If your system is older still and runs on R-22, that's a different situation; our R-22 options guide covers it.
Mixing refrigerants, and why a new condenser needs a new coil
Two rules hold on every job:
- No mixing, no top-offs with a different refrigerant. A system is designed and rated for one refrigerant. EPA's homeowner guidance says alternative refrigerants will not work well without making changes to system components, and it warns specifically against propane and other unapproved refrigerants as a fire hazard. If someone offers to "top off" your R-410A system with something else, say no.
- The outdoor unit and indoor coil are a matched pair. An R-454B or R-32 condenser needs an evaporator coil and metering device built for that refrigerant. The efficiency rating on the brochure belongs to a certified combination of condenser, coil and furnace or air handler, not the outdoor unit alone. Ask for the AHRI certificate for the exact match, or look it up in the AHRI directory.
That second rule catches people in one common spot: the coil on top of your furnace is 10 years old and fine, the condenser died, and a quote offers a new-refrigerant condenser only. That doesn't work. Either the coil gets replaced with the condenser, or, while stock lasts, an R-410A condenser made before 2025 gets matched to the existing coil. If the coil itself is leaking, our post on evaporator coil leak symptoms explains what to look for.
The Minnesota angle: timing, furnaces and heat pumps
Our cooling season is short, and most AC failures here show up on the first hot, humid week in June or July. That's the worst time to learn your coil and condenser need replacing together. If your air conditioner is 15 years or older, get a written replacement quote in the off-season so the decision isn't made at 88 degrees and muggy.
The coil sits on your furnace, so the furnace's age matters too. In a lot of Twin Cities houses, the furnace and AC went in together and are aging together. If the furnace is 15 to 20 years old, pricing both at once can save a second install a couple of years later. And if you're replacing the condenser and coil anyway, a heat pump costs more but cools the same way and can take over spring and fall heating, with the furnace as backup in deep cold. Our heat pump page covers cold-climate models.
What you can check yourself
- Find your refrigerant. The data plate on the side of the outdoor unit lists the refrigerant type and factory charge.
- Check the coil age. The indoor coil has its own label, usually on the cabinet above the furnace. Note the model and serial number for any quote.
- Read the quote. It should name the refrigerant, list the condenser and coil model numbers, and say whether the coil is being replaced.
Leave gauges, refrigerant and valves alone. Handling refrigerant takes EPA 608 certification.
Cost and next steps
Central AC replacement with us runs $5,200–$9,800 installed, and heat pumps run $7,500–$14,500. The coil, tonnage, staging and line set condition move the price more than the refrigerant name does. See our Minneapolis HVAC cost page for local context, or our AC installation page for how we quote.
If your current system isn't cooling, start with AC repair: a service call is a $79 trip charge, waived when you approve the repair, and you get a written flat-rate price before any work starts. Call 612-429-3465; we're open 7 days, 7am–9pm.
Questions
Can R-454B be added to my R-410A air conditioner?
No. Each system is built and rated for one refrigerant, and mixing refrigerants in a system isn't done. EPA's own homeowner guidance says alternative refrigerants will not work well without changes to system components. If your R-410A system is low, the fix is to find the leak, repair it and recharge with R-410A, or replace the system as a matched set.
Is R-410A banned?
No. EPA's rule limits the refrigerant in newly manufactured residential systems starting January 1, 2025. On May 21, 2026, EPA removed the January 1, 2026 installation deadline, so R-410A equipment made or imported before 2025 can still be installed until that inventory runs out. Existing R-410A systems can still be serviced, repaired and recharged.
Are A2L refrigerants dangerous in my house?
A2L means lower toxicity and lower flammability, with a slow flame speed. EPA lists R-454B and R-32 as acceptable for home AC and heat pumps under use conditions that require the equipment to meet the UL 60335-2-40 safety standard, with flammable-refrigerant warning labels. The practical rule for you is simple: have a certified technician install and service it, and never let anyone add a different refrigerant.
Does a new R-454B air conditioner cost more?
New systems on the new refrigerants are what manufacturers now build, so there isn't a cheaper R-454B-free option once pre-2025 stock is gone. Our central AC replacements run $5,200–$9,800 installed. The coil, line set condition, tonnage and staging move the price more than the refrigerant name does.
Sources
- Technology Transitions page epa.gov
- AHRI directory ahridirectory.org
- HomeGuide cost guides (2026 editions) homeguide.com