R-410A Phase-Out Rules for AC and Heat Pump Replacement
You can still legally run, repair and recharge an existing R-410A air conditioner or heat pump in both the US and Canada. What changed is new equipment: since January 1, 2025, residential and light commercial split systems built for the US market must use a refrigerant with a global warming potential (GWP) of 700 or less, which means R-454B or R-32 instead of R-410A. A May 2026 EPA rule removed the deadline for installing leftover R-410A units built before 2025, so remaining stock can still be installed until it runs out.
That is the short version. The details matter if you are deciding whether to repair an older system, buy a discounted R-410A unit, or move to a new A2L system this winter.
Where the US rules stand in late 2026
The rules come from the American Innovation and Manufacturing (AIM) Act of 2020 and the EPA's Technology Transitions Rule, finalized in October 2023. For residential and light commercial air conditioning and heat pumps, that rule set a GWP limit of 700 for systems manufactured or imported from January 1, 2025. R-410A has a GWP of roughly 2,088, so it does not qualify.
The original rule also gave contractors one extra year: split-system components made before 2025 could be installed only until January 1, 2026. That date caused a lot of anxiety in the trade, since distributors were holding R-410A condensers and coils they might not be able to sell.
On May 21, 2026, the EPA finalized revisions that drop that installation deadline for residential and light commercial AC and heat pump systems, as long as the equipment was manufactured or imported before January 1, 2025. The revision took effect on July 27, 2026. Several industry groups have challenged parts of the revised rule in court, mostly over commercial refrigeration provisions, so it is worth asking your contractor whether anything has shifted before you sign.
Two points to keep straight:
- No new R-410A systems are being built for the US market. The relief only covers inventory that already exists. Once a given model sells out, it is gone.
- Variable refrigerant flow (VRF) systems run on their own timeline. Earlier versions of the rule allowed R-410A VRF equipment manufactured before 2026 to be installed through January 1, 2027. Confirm the current VRF date with the equipment supplier if you manage a building with VRF.
How Canada handles it
Canada controls HFCs through the federal Ozone-depleting Substances and Halocarbon Alternatives Regulations (ODSHAR), which phase down national HFC consumption in steps: a 40% cut from baseline by 2024, 70% by 2030 and 85% by 2036. In practice, Canadian homes and buildings are moving to the same R-454B and R-32 equipment as the US, because the major manufacturers build one product line for both markets.
Handling refrigerant is regulated at the provincial level. In Quebec, the Règlement sur les halocarbures requires that work on refrigeration and air conditioning systems be done by a holder of an environmental qualification certificate, and it prohibits venting halocarbons. Ontario's O. Reg. 463/10 sets similar rules, including the Ozone Depletion Prevention card for technicians. Other provinces have their own versions. Whoever installs or services your system should be able to show the certificate your province requires.
What this means for the system you already have
An R-410A system that works is not illegal, and nobody is required to replace it. Recovered and reclaimed R-410A will stay available for service for years. The catch is price. As production allowances shrink, refrigerant costs tend to climb, and a system with a slow leak becomes more expensive to keep topping up.
A reasonable way to think about it:
- Newer system, small repair: repair it. A five year old R-410A heat pump with a failed capacitor or fan motor has plenty of life left.
- Older system, major refrigerant work: a failed compressor or a leaking evaporator coil on a 12 to 15 year old unit is usually the point where replacement makes more sense, especially if the repair involves a large refrigerant charge.
- Mismatched parts: you cannot drop R-454B into an R-410A system, and you should not pair a new A2L outdoor unit with an old R-410A indoor coil. Plan to replace matched components together.
Should you buy a leftover R-410A unit?
Some suppliers are discounting remaining R-410A stock. It can be a fair deal if the price is meaningfully lower, the unit is a matched system with a full manufacturer warranty, and you understand that future refrigerant service may cost more than it would on a newer system.
It is a poor deal when the discount is small, when the warranty is shortened, or when the unit is a partial match for your existing equipment. For a system you expect to keep 15 years or more, most owners are better served by an R-454B or R-32 unit, and many current cold-climate heat pumps are only offered with the newer refrigerants anyway.
What changes with A2L refrigerants
R-454B and R-32 are classed as A2L: lower toxicity and mildly flammable. They are safe when installed to the current standards, but the installation looks a little different:
- Equipment is listed to UL 60335-2-40, and building codes reference ASHRAE 15 for refrigerant safety.
- Many indoor units include a refrigerant leak sensor that turns on the blower to disperse any leak.
- Room size and the amount of refrigerant in the system can affect where indoor units may go, so a proper load and layout review matters more than before.
- Technicians need tools rated for A2L work, including recovery machines and leak detectors.
For a commercial building with rooftop units, the same transition applies to new packaged equipment. If you are planning several RTU replacements over a few years, pick one refrigerant platform early so parts and service stay consistent.
Planning a replacement around the rules
Before you get quotes, gather the age and model numbers of the outdoor and indoor equipment, any recent repair invoices that mention refrigerant, and the size and layout of the space. Ask each contractor:
- Which refrigerant the proposed system uses, and whether the indoor coil or air handler is being replaced to match.
- Whether the quote includes a load calculation rather than a like for like swap.
- How old refrigerant will be recovered and documented.
- What rebates apply in your area, since many heat pump programs in Canada and the US require specific equipment listings.
Our guides on heat pump installation and central air conditioning cover sizing and equipment choices in more detail, and the heat pump vs furnace cost comparison helps if you are weighing a switch in heating fuel at the same time.
Frequently asked questions
Is it illegal to have an R-410A air conditioner?
No. Owning, operating, repairing and recharging an existing R-410A system remains legal in both the US and Canada. The rules restrict the manufacture and import of new R-410A equipment, not the use of systems already installed. Venting refrigerant is illegal, so any service must recover it properly.
Can a contractor still install an R-410A system in 2026?
In the US, yes, if the equipment was manufactured or imported before January 1, 2025. The EPA removed the January 1, 2026 installation deadline in a rule that took effect July 27, 2026. Supply is limited to existing inventory, so availability depends on the model and the distributor.
Can R-454B be added to an R-410A system?
No. R-454B is not a drop-in replacement, and the system components, oil and safety listings are different. Mixing refrigerants voids warranties and creates safety risks. Converting means replacing the outdoor unit and the matching indoor coil or air handler together.
Will R-410A refrigerant get more expensive?
It is likely, because the HFC phase-down in both countries reduces new production over time and demand shifts to reclaimed supply. Prices vary by region and season, and no one can predict an exact figure. Owners of leaking systems tend to feel the increase first.
Get a replacement quote
If your system is aging or needs major refrigerant work, tell us about the building and we will scope the right equipment and refrigerant platform before quoting.