R-410A Phase Out After 2025: What Homeowners Can Still Do

• Keep using it. EPA states that you can continue to use your air conditioner, and that the rule was designed so owners can keep using and repairing legacy systems throughout their useful life.
• Repair it. The rule does not restrict the use of HFCs in ordinary repair and servicing.
• New systems are restricted. Since January 1, 2025, no person may install a new residential or light commercial air-conditioning or heat pump system (other than a VRF system) that uses an HFC, or a blend containing an HFC, with a global warming potential (GWP) of 700 or greater.
• One exception remains. A new system at or above that limit may still be installed if all of its specified components were manufactured or imported before January 1, 2025, and since July 27, 2026 that exception has no installation deadline.
• The January 1, 2026 cutoff is gone. A final rule published May 26, 2026 removed it.
• It is not settled. An industry petition filed in the D.C. Circuit in August 2026 challenges the 2026 rule, and its outcome was not known when this page was written.

This page relies on the rule itself: Federal Register document 2026-10387 (91 FR 31284, effective July 27, 2026) and 40 CFR 84.54, as the eCFR text stood on October 15, 2026. It does not rely on EPA's FAQ page for the installation rule, for reasons explained below. Where a statement comes only from that FAQ, the text says so.

The GWP limit of 700 for new systems

GWP measures how strongly a gas traps heat in the atmosphere compared with carbon dioxide. R-410A is an HFC blend, and the installation paragraph of 40 CFR 84.54 sets a GWP ceiling rather than naming a refrigerant. Effective January 1, 2025, residential or light commercial air-conditioning or heat pump systems using a regulated substance, or a blend containing one, with a GWP of 700 or greater may not be installed, except variable refrigerant flow (VRF) systems.

The rule defines "install" as completing a field-assembled system's circuit, including charging it with a full charge, so that the system can function and is ready for its intended use. So the rule looks at the point where a new system is completed and charged for use.

What changed for manufacturers and importers

The same date applies to equipment makers. No person may manufacture or import self-contained residential and light commercial air conditioning or heat pump products that use a refrigerant at or above the 700 GWP limit. EPA states directly that the manufacture and import of R-410A residential and light commercial air conditioning products are prohibited starting January 1, 2025.

What did not change

The 2023 Technology Transitions rule does not require anyone to replace existing equipment, and it places no restrictions on continued servicing, repair and maintenance of existing equipment. Manufacturers and importers can also keep supplying components and parts for existing systems, so those systems can be serviced throughout their useful life.

The installation date for new systems has been rewritten twice, which is why you may see different dates quoted.

October 2023: the original rule

The Technology Transitions final rule, published October 24, 2023 (88 FR 73098) and effective December 26, 2023, set January 1, 2025 as the installation date for residential or light commercial AC or heat pump systems with a GWP of 700 or greater. It made no allowance for pre-2025 components.

December 2023: one more year

An interim final rule published December 26, 2023 (88 FR 88825) allowed one additional year, until January 1, 2026, solely for installing new systems that use components manufactured or imported before January 1, 2025. EPA described this as letting pre-2025 condensing units, evaporators and air handlers using R-410A be assembled into new systems, so long as the systems were assembled before January 1, 2026. That is where the "January 1, 2026" date you may have seen comes from.

May 2026: the deadline removed

The final rule published May 26, 2026 (91 FR 31284, FR Doc. 2026-10387), effective July 27, 2026, removed the deadline for installing residential and light commercial AC and heat pump systems that use specified components manufactured or imported into the United States before January 1, 2025. The rule as a whole addresses administrative petitions and input from regulated industry. For the installation date, EPA also considered extending it to January 1, 2027 as another way to avoid stranding inventory.

What the regulation says now

40 CFR 84.54(c)(1) now allows new residential and light commercial AC and heat pump systems with a GWP of 700 or greater to continue to be installed where all specified components are manufactured or imported before January 1, 2025. "Specified components" means condensing units, condensers, compressors, evaporator units and evaporators. Other parts, such as valves and refrigerant piping, are not restricted and can be installed regardless of manufacture or import date.

In practice, the test for installing a new R-410A system is no longer a calendar date on the job. It is the manufacture or import date of the equipment going in.

EPA's own HFC FAQ page, last updated September 14, 2026, still says that any new split system installed after January 1, 2026 must use refrigerant with a GWP less than 700, and that components using R-410A cannot be used to install a new R-410A system beginning January 1, 2026. Those statements reflect the superseded interim final rule, not the regulation as amended and in force since July 27, 2026.

If a contractor, a dealer or a web page quotes that January 1, 2026 line, check it against the Federal Register rule and 40 CFR 84.54. The FAQ's statements about repairs and replacement parts are a separate matter. Below, we cite them as FAQ statements and, where the rule text says the same thing, we cite that too.

Is repair allowed?

Yes. The rule does not restrict the use of HFCs in ordinary repair and servicing, and EPA does not apply the restrictions to retrofit applications. When EPA reconsidered the rule in 2026, it said it anticipates the move away from R-410A will continue without the agency restricting the repair of R-410A systems. It pointed to the earlier change: the ability to repair R-22 systems did not prevent the transition from R-22 to R-410A. For that earlier switch, see our guide to R-22 to R-410A conversion.

Replacing a failed part

EPA's FAQ states that a homeowner whose R-410A condensing unit broke can replace the faulty component, such as the condensing unit, the indoor coil or other smaller parts, with a similar R-410A component. The 2026 rule made no changes to how new condensing units used as replacements are treated. EPA's FAQ also states there is no date after which condensing units designed to use R-410A can no longer be sold.

Parts labelled "For servicing existing equipment only"

A specified component meant for use with a refrigerant above the applicable GWP limit must carry a permanent label stating "For servicing existing equipment only." EPA says R-410A condensing units may be imported after January 1, 2025 only to repair existing R-410A systems, not to install new ones. The label is a clue to a part's intended use. If a contractor proposes an R-410A part, ask whether it is a servicing part for your existing system or part of a new installation.

Refrigerant availability

Separate from the installation rule, the amount of HFCs that can be produced and consumed in the United States each year is capped on a falling schedule, set as a percentage of a baseline: 90 percent for 2022 and 2023, 60 percent for 2024 through 2028, 30 percent for 2029 through 2033, 20 percent for 2034 and 2035, and 15 percent for 2036 and after. Those caps cover HFCs in total, not R-410A alone. The rule text reviewed for this page does not say how they will affect R-410A supply, and this page does not predict it. For any repair that needs refrigerant, ask your contractor whether the refrigerant and parts are on hand before you decide.

It depends on what "buy" means.

A self-contained unit

Window units, portable units and similar self-contained products fall under the manufacture and import prohibition above. The rule lets restricted products be sold for three years after their category's date, and EPA states that R-410A packaged terminal air conditioners manufactured before January 1, 2025 may be sold, distributed or exported until January 1, 2028. This page does not work out the end date for every product type.

A new central or split system

A new system can still be installed with R-410A only where every specified component was manufactured or imported before January 1, 2025, and there is no installation deadline for that. Whether a contractor can supply one is a question about the equipment on hand. Ask how they know the components pre-date 2025, because that date, not the date of your job, is what the rule turns on.

Parts for the system you have

Servicing parts and replacement condensing units for existing R-410A systems are covered in the repair section above.

The phase out changes what can be installed new. It does not tell you what to do with a system that is running. Work through the choices in this order.

Option 1: repair the system you have

The phase out alone is not a reason to replace a system that can be repaired, because nothing in the rule requires replacing existing equipment. The decision rests on the usual questions: what failed and why, how the rest of the system looks, how often it has needed work, and how well it keeps the home comfortable. Our guide on how to decide between AC repair and replacement walks through them.

Option 2: like-for-like R-410A

Like-for-like can mean two different jobs, and the rule treats them differently.

• Replacing a failed component (a condensing unit, an indoor coil or a smaller part) with a similar R-410A component. EPA's FAQ states a homeowner can do this.
• Installing a complete new R-410A system. This is allowed only where all specified components were manufactured or imported before January 1, 2025.

Before agreeing to either, ask which of the two the quote is for. If it is a new system, ask how the contractor knows every specified component pre-dates 2025. Also weigh the open court challenge described below: we cannot say what a ruling would change, or whether it would reach a system that is already installed.

Option 3: a new R-454B or R-32 system

A new system built for a refrigerant with a GWP under 700, such as R-454B or R-32, sits below the limit that restricts new R-410A installations. Ask the installer to confirm the refrigerant in the specific model you are quoted. Both refrigerants are classed as mildly flammable, which is part of why handling and installation practice differs from R-410A. The indoor and outdoor parts of a system must be built for the same refrigerant, so this is a whole-system conversation, not a single-part swap.

Whichever route you take, equipment size and setup matter as much as the refrigerant. Blume sizes equipment by ACCA Manual J load calculation and Manual S selection, not rule-of-thumb swaps. We commission with measured static pressure, airflow and refrigerant charge, and document them. We put repair and replacement options side by side, and we do not sell equipment a building does not need.

Questions to bring to any contractor

• What refrigerant does my system use today, and where can I see it?
• Is this quote for a replacement part or for a new system?
• If it is a new R-410A system, how do you know every specified component was manufactured or imported before January 1, 2025?
• If it is a new system on another refrigerant, which refrigerant is it, and are the indoor and outdoor parts matched?
• Was the size chosen by a load calculation?

• The court challenge. An industry petition filed in the D.C. Circuit in August 2026 challenges the 2026 rule. Its outcome was not known when this page was written. The material reviewed here does not include the petition's arguments, so this page does not describe them or predict what a ruling would change.
• EPA's FAQ page. As of its September 14, 2026 update it still carries the superseded January 1, 2026 statements, and EPA may revise it.
• New system or replaced components. EPA's FAQ allows replacing a faulty component with a similar R-410A component, and the rule restricts installing a new system. The material reviewed for this page does not say exactly where one stops and the other starts when several major components are replaced in the same job. Ask your contractor which applies to your job, and why.
• Refrigerant supply. The HFC caps are in the rule. Their effect on R-410A availability is not.
• The date of this page. It reflects the eCFR text as of October 15, 2026 and EPA's FAQ as updated September 14, 2026. Rules and pages can change.

VRF systems follow separate dates

Variable refrigerant flow (VRF) systems are excluded from the January 1, 2025 installation limit. Their own restriction took effect January 1, 2026. Systems whose specified components were manufactured or imported before January 1, 2026 may be installed before January 1, 2027, or before January 1, 2028 where an approved building permit issued before October 5, 2023 specifies the restricted refrigerant. In the 2026 reconsideration, EPA did not extend the installation date for VRF equipment manufactured or imported before January 1, 2026.

Blume Mechanical Service is a Class A licensed Florida mechanical contractor (license CAC-1822618), fully insured, handling residential and commercial design-build, maintenance, repair, installation and replacement in Pinellas, Hillsborough and Pasco counties. Our refrigerant work is done by EPA Section 608 certified technicians. We are brand-agnostic: we sell, install and service all major manufacturers as a licensed contractor. Blume offers 24/7 emergency HVAC service, with same-day response available based on location and technician availability.

To talk through your system, call 727-330-9131.