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New home air conditioners and heat pumps now use R-454B or R-32 instead of R-410A, because federal rules limit the climate impact of refrigerants in new equipment. Your existing R-410A system can still be repaired and serviced. What changes is what you buy next.
The two new refrigerants are not drop-in substitutes. A replacement usually means a matched indoor and outdoor system, installed by a contractor trained for these refrigerants. Before you approve a changeout, it is worth confirming what you have, whether repair still makes sense, and whether the proposed system is sized and installed correctly.
Key takeaways
- Since January 1, 2025, manufacturers can no longer make or import new residential air conditioning and heat pump systems that use refrigerants above 700 GWP, which rules out R-410A.
- In May 2026 the EPA removed the January 1, 2026 deadline for installing R-410A equipment made before 2025. That rule took effect July 27, 2026.
- Servicing an existing R-410A system with R-410A remains legal.
- California has its own HFC rules through the California Air Resources Board, including a planned ban on bulk sales of R-410A starting in 2030.
- R-454B and R-32 are classed A2L, meaning lower toxicity and lower flammability. Installation practices and equipment safety features differ from R-410A.
What changed, and when
The federal American Innovation and Manufacturing (AIM) Act directs the EPA to phase down hydrofluorocarbon refrigerants. Under the EPA’s Technology Transitions rule, new residential and light commercial air conditioning and heat pump systems must use refrigerants with a global warming potential (GWP) of 700 or less. R-410A is around 2,088, so it no longer qualifies for new equipment.
| Date | What it means for homeowners |
|---|---|
| January 1, 2025 | New R-410A residential split systems can no longer be manufactured or imported. New equipment moves to R-454B or R-32. |
| May 21, 2026 | The EPA finalized a rule removing the January 1, 2026 installation deadline for R-410A equipment made or imported before 2025. |
| July 27, 2026 | That EPA rule took effect, so remaining pre-2025 R-410A inventory can still be installed under federal rules until it runs out. |
| January 1, 2030 | Under California law, bulk sales of refrigerants above 1,500 GWP, which includes R-410A, are scheduled to end in the state. |
California also applies its own limit to new air conditioning equipment through the California Air Resources Board. If a contractor offers you an R-410A system, ask them to confirm in writing that it is legal to install in California and what it means for future service.
R-410A vs R-454B vs R-32 at a glance
| R-410A | R-454B | R-32 | |
|---|---|---|---|
| Status in new home systems | Being phased out | Used in many new central systems | Used in many new ductless and some central systems |
| Approximate GWP | 2,088 | About 466 | About 675 |
| Safety class | A1 (non-flammable) | A2L (lower flammability) | A2L (lower flammability) |
| Can it be added to an R-410A system? | Yes, for repairs | No | No |
Which refrigerant you end up with usually depends on the brand and product line, not on a choice you make separately. R-454B is common in new ducted systems, while many ductless mini-split lines use R-32.
What A2L means for your home
A2L refrigerants are classed as lower toxicity and lower flammability. In practice, that changes how systems are designed and installed rather than how you live with them.
- Built-in safety features. Many A2L systems include a refrigerant leak sensor and a mitigation response, such as running the blower to disperse refrigerant. These features need to be wired and commissioned as the manufacturer specifies.
- Installer training and tools. Technicians should be trained on A2L handling, recovery, and brazing practices for these refrigerants.
- Manufacturer instructions matter more. Line set reuse, charge limits, and equipment placement follow the manufacturer’s installation manual and local code.
Do you have to replace your R-410A system?
No. Nothing in the federal rule requires you to replace a working R-410A system. It can be repaired, recharged with R-410A, and maintained for the rest of its life. The practical questions are cost and timing.
- Refrigerant supply. R-410A production is being reduced under the AIM Act, and industry groups have said they expect prices for existing refrigerants to rise. A repeat leak gets more expensive over time.
- Matched parts. Replacing only the outdoor unit or only the indoor coil on an R-410A system depends on finding compatible R-410A components. A full switch to an A2L system replaces both.
- Age and condition. An older system with a recurring leak or a failing compressor is often the point where replacement makes more sense than repair.
The right call depends on the specific system. That is why an inspection comes before the decision, not after it.
What to check before you approve a changeout
- Confirm the refrigerant and age from the data plates on the outdoor unit and indoor coil or air handler.
- Find out why the system is being replaced: a failed part, a repeat leak, or a sales recommendation.
- Ask whether the new system is a matched indoor and outdoor combination, and get the model numbers.
- Ask whether sizing came from a Manual J load calculation or simply matched the old tonnage.
- Ask whether the existing line set will be reused and whether the manufacturer allows it.
- Confirm the leak detection and mitigation features will be installed and tested.
- Confirm a permit will be pulled and that any required field verification will be done. See HERS vs ECC for what changed in 2026.
Buying or selling a home with an R-410A system
An R-410A system is not a defect. Most homes on the market still have one. In escrow, what matters is the same as always: age, condition, leaks, airflow, and whether past work was permitted. Our HVAC inspection checklist covers what we test, and a cost-to-cure report can put a documented price on any repairs before you negotiate.
What can change the answer?
- The age and repair history of the existing system
- How available and how expensive R-410A and compatible parts are when you need them
- Whether your home has ducted central air, ductless, or both
- Electrical capacity and equipment placement for the new system
- Utility rebates, which usually require a final approved permit. See our heat pump vs gas furnace guide for current LADWP figures.
Frequently asked questions
Is R-410A banned in California?
Using and servicing existing R-410A systems is still legal. New equipment is held to lower-GWP limits under federal and California rules, and California law is set to end bulk sales of R-410A in 2030.
Can I put R-454B or R-32 in my R-410A system?
No. They are different refrigerants with different equipment designs. An R-410A system is repaired with R-410A, and an A2L system is installed as its own matched system.
Is R-32 or R-454B better?
Both meet the federal limit for new equipment and are both A2L. The better system is the one that is correctly sized, matched, and installed. The refrigerant usually comes with the product line you choose.
Are A2L refrigerants safe in a home?
They are classed as lower toxicity and lower flammability, and systems that use them include safety features required by the manufacturer. Those features need to be installed and tested correctly.
Should I replace my R-410A system now?
Not just because of the refrigerant. Base the decision on the system’s age, condition, and repair history. An inspection gives you that picture before you spend money.
Sources
Get a second opinion before you approve a changeout
We document your system’s refrigerant, age, condition, and sizing so you can decide between repair and replacement with the facts. $595 per system, with photos and a written report.
