Central air and heat pump systems built before 2025 commonly use R-410A. In 2025 the rules for new systems changed, and a lot of confusing advice followed. Here is what the federal rules say, in plain words.
What the 2025 rule restricts
Under 40 CFR 84.54(a)(1), from January 1, 2025, new self-contained home and light commercial air conditioners and heat pumps cannot be made or imported if their refrigerant has a global warming potential (GWP) of 700 or higher. Under 84.54(c)(1), installing a new split system on such a refrigerant is restricted too, unless all of its specified components were made or imported before January 1, 2025. R-410A has a GWP of 2,090, so it falls above the line. Those restrictions are about new equipment.
A final EPA rule that took effect on July 27, 2026 lets air conditioning and heat pump equipment made or imported before January 1, 2025 keep being installed, with no end date. The earlier installation deadline was removed. That is a rule for the installers of new systems, and this site does not sell them.
What the rule does not restrict
EPA wrote the rule to allow continued servicing of existing equipment. The rule defines five specified components: condensing units, condensers, compressors, evaporator units and evaporators. Those parts are not caught by the manufacture and sale restrictions, and those made for refrigerants above the limit must carry the label "For servicing existing equipment only" after January 1, 2025.
So servicing and refilling an existing R-410A system remains possible, and a refrigerant leak on your older system is a repair question, not a legal one.
Will refrigerant stay available?
The AIM Act phases down the total amount of hydrofluorocarbons produced and imported, in steps: 60 percent of baseline from 2024 through 2028, 30 percent from 2029 through 2033, and lower after that. EPA notes the phasedown allows production starting in 2036 at 15 percent of baseline and continuing indefinitely. EPA has also said these refrigerants will remain available to service existing equipment. Supply tightens in steps, but EPA describes no cutoff.
What A2L refrigerants are
New systems now use refrigerants such as R-32 and R-454B, with global warming potentials of 675 and 470, under the 700 line. They carry a safety classification of A2L, which means lower toxicity and a lower flammability class. They are listed by EPA for new equipment only and under conditions: the equipment must be built to UL 60335-2-40, which covers charge size, ventilation and flammability warnings and markings.
Why you cannot swap the refrigerant in an old system
EPA's listing says these refrigerants are for new equipment only. They are not listed as a conversion or retrofit refrigerant. Nobody can legally put R-454B into your R-410A air conditioner. So the real choices when the system leaks are:
- Find and repair the leak, then refill with R-410A.
- Replace the whole system with a new one.
There is no half-way option that involves changing the refrigerant.
Who may handle refrigerant
A technician who could break the refrigerant circuit must hold EPA Section 608 certification. Federal law prohibits knowingly venting refrigerant during service. Recovered refrigerant generally cannot be sold or passed to a new owner until a reclaimer has reprocessed it. Refrigerant cannot be sold to anyone who lacks Section 608 certification and does not employ a technician who holds it, apart from a short list of exceptions, so a do-it-yourself refill is off the table.
What to do if you were told it is obsolete
Ask the person who said so which part failed, why that part cannot be repaired and what the cost of the repair is. A condenser that is old but running is not obsolete. A system with a leaking coil may be a close call. Ask for both the repair price and what happens to the system if you wait.
Where this leaves you
If your air conditioner or heat pump is acting up, the likely causes are the usual ones: a capacitor, a contactor, a frozen coil or a leak. A contractor can tell which. The refrigerant rule does not change that.