Guides

R-454B Refrigerant Transition for HVAC Contractors (2026)

What EPA's 2026 rule changed, when you can still install or repair R-410A equipment, what A2L refrigerants change on the job, and how to quote, stock and explain it to customers.

Ijharul Islam October 21, 2026 9 min read

The R-454B refrigerant transition for HVAC contractors, in short: since January 1, 2025, new residential AC and heat pump systems need a refrigerant with a GWP of 700 or less, such as R-454B (470). EPA's May 2026 rule removed the January 1, 2026 install deadline, so pre-2025 R-410A stock can still go in, and R-410A systems can still be repaired.

More on this topic: Running a trade business, every guide in one place.

Most of what was written about the switch in 2024 and 2025 told contractors to clear their R-410A inventory by the end of 2025. That changed. EPA's reconsideration rule, final in May 2026 and effective July 27, 2026, lets equipment made or imported before 2025 be installed until supply runs out. This guide covers what the rules say now (checked on epa.gov in October 2026), what changes on an A2L install, what to buy and train for, and how to quote and explain the choice to homeowners. It's general information, not legal advice; your local mechanical code and the manufacturer's instructions govern each install.

Key takeaways

New systems: since January 1, 2025, new residential and light-commercial AC and heat pump systems need a refrigerant with a GWP of 700 or less.
Old stock: there's no install deadline for systems whose specified components were all made or imported before January 1, 2025 (EPA, May 2026).
Repairs: components used to repair existing systems aren't restricted, and EPA left replacement condensing units unchanged.
No retrofits: EPA lists R-454B for new equipment only. Don't convert an R-410A system or top one refrigerant up with another.
A2L safety: EPA's listing requires equipment that meets UL 60335-2-40 (Edition 3), and EPA points to ASHRAE 15 for safe installation.
R-410A gets scarcer over time: the AIM Act cuts HFC production and imports to 15% of baseline by 2036, so price service refrigerant from current cost.

What changed in the R-454B transition, and when?

The transition comes from EPA's Technology Transitions program under the American Innovation and Manufacturing (AIM) Act. The program limits high-GWP HFCs like R-410A (GWP 2,090) in new equipment. The rules changed several times, so here is the sequence for residential and light-commercial AC and heat pumps:

Date	What happened
October 2023	Final rule: GWP limit of 700 for new residential and light-commercial AC and heat pump systems from January 1, 2025
December 2023	Interim rule: systems built from components made or imported before 2025 can be installed until January 1, 2026
December 2024	Variable refrigerant flow (VRF) systems: higher-GWP equipment made before January 1, 2026 can be installed until January 1, 2027 (2028 for some projects permitted before October 5, 2023)
October 2025	EPA proposes to reconsider parts of the 2023 rule
May 21, 2026	Final reconsideration rule removes the January 1, 2026 install date for pre-2025 equipment; effective July 27, 2026

Self-contained products such as window and portable AC units follow a separate products table: the manufacture and import date was January 1, 2025, and EPA's table says sale and distribution end three years after that date.

Can you still install R-410A equipment in 2026?

Yes, if every specified component of the system was manufactured in or imported into the US before January 1, 2025. EPA's sector table now lists “no installation compliance date” for those systems. A new split system with any component made in 2025 or later must use a refrigerant with a GWP of 700 or less.

In practice: check the manufacture date on the outdoor unit and the coil or air handler before you quote, keep the distributor's paperwork with the job, and don't promise a customer an R-410A system you haven't confirmed is in stock. Supply of pre-2025 equipment only shrinks from here.

Repairs are a different question. EPA's tables say components used to repair existing systems aren't covered by the install restrictions. In the May 2026 rule, EPA also declined to change how replacement condensing units are treated, so an owner whose R-410A condenser fails can still choose a replacement condenser instead of a whole new system.

What is different about installing an A2L system?

R-454B and R-32 are classed A2L: lower toxicity and mildly flammable. EPA lists both as acceptable in new residential and light-commercial AC and heat pumps “subject to use conditions”, and those conditions require equipment that meets UL 60335-2-40 Edition 3. Equipment certified to Edition 4 is fine if it also meets Edition 3, and charge sizes must stay within Edition 3 limits. On safety, EPA says following ASHRAE Standard 15 protects technicians and occupants. Which code edition applies on a job depends on what your state or city has adopted, so check with the local building department.

Follow the installation manual line by line: minimum room area, charge limits, line set length and any refrigerant detection sensor wiring are set by the equipment maker.
No ignition sources near the work: treat brazing, recovery and charging with the same care as any flammable gas, and ventilate.
Charge only with the refrigerant on the nameplate. EPA's Section 608 test topics include the need to avoid mixing refrigerants and that blends fractionate when they leak.
Label and document the refrigerant and charge on the unit and on the job record.

Can you convert or top off a system with a different refrigerant?

No. EPA's SNAP list shows R-454B and R-32 as acceptable for new equipment only, not for retrofits, so an R-410A system can't be converted to R-454B. Going the other way, adding R-410A to an R-454B system mixes refrigerants. That ruins the charge, can void the warranty and puts an R-410A charge into equipment designed and certified for something else. If a customer's R-454B system is short and you can't get R-454B, the honest answer is to recover, repair the leak and come back with the right refrigerant.

What tools and training do your technicians need?

Item	What to check
Recovery machine	Listed by its maker for A2L refrigerants
Vacuum pump	Listed by its maker for A2L refrigerants
Leak detector	Sensor that detects R-454B and R-32
Gauges or digital manifold	Pressure-temperature data for R-454B and R-32 loaded
Recovery cylinders and adapters	Rated for the refrigerant; check the fittings on the cylinders your distributor stocks
Scale and charging hoses	Dedicated or cleaned hoses to avoid cross-contamination

Federally, the training requirement hasn't changed: technicians who open a refrigerant circuit need EPA Section 608 certification, which already covers HFCs and non-exempt substitutes such as R-454B. See our EPA 608 certification guide. There is no separate federal A2L card, but equipment makers and training organizations run A2L courses. Send at least your installers before their first A2L job, and keep a record of who attended.

What happens to R-410A supply and prices for service work?

R-410A is still legal to produce, import and use for servicing, but the AIM Act phases down HFC production and consumption to 15% of baseline by 2036, through allowances EPA issues each year (the 2027 allowances were issued on October 1, 2026). Fewer allowances mean less virgin R-410A over time and more reliance on recovered and reclaimed refrigerant. We couldn't find a reliable national price to quote, so don't put a fixed per-pound price in your price book for a year: update it from your distributor's current cost every month or two.

Two related dates from EPA's 2024 Emissions Reduction and Reclamation rule: from January 1, 2028, disposable cylinders must have their remaining refrigerant removed before they're discarded. Its HFC leak repair rules apply to appliances with 15 pounds or more of charge and exclude residential and light-commercial AC and heat pumps.

What should you tell customers?

Most homeowners have heard “R-410A is banned”. Give them the three real options in plain words:

Situation	Option	What to say
R-410A system, repairable	Repair it	“Your system can still be repaired, and R-410A is still available for service. Over the next few years it will likely get more expensive.”
R-410A system, failed condenser	Replacement condenser, if one is available	“We can replace just the outdoor unit with a matching R-410A unit, which is often cheaper than a full system. It keeps your system on R-410A.”
Replacing the whole system	New A2L system (R-454B or R-32), or remaining pre-2025 R-410A stock	“New systems now use a newer refrigerant such as R-454B, and that's what current equipment is built for. If we can still get an older R-410A system, we'll show you both.”

How should you change quoting and stocking?

Quote replacements as options. Put repair, condenser replacement and full A2L replacement side by side; see good, better, best quotes.
Reprice A2L installs from real hours. Track the first ten A2L jobs and update labor hours in your price book; see how to price heat pump installation.
Separate refrigerant lines in the price book for R-410A, R-454B and R-32, priced per pound from current cost.
Stock R-454B before summer. Agree an allocation with your distributor rather than buying day to day.
Don't overbuy R-410A equipment on the strength of the 2026 rule: you can install it, but customers increasingly ask for the new refrigerant.
Teach the CSR one sentence about the change so phone answers match what techs say on site; add it to your call booking script.

Where CrewRobin fits

CrewRobin's price book holds separate lines for each refrigerant and for A2L install labor, and those lines feed good, better, best quotes the customer picks and signs online. Checklists per job type let you add A2L install steps (sensor wiring checked, charge recorded, unit labeled) with a photo per step in My day. The AI receptionist quotes only the price range you set per job type, so callers asking about “the new refrigerant” don't get an invented number. See how it works for HVAC companies.

Frequently asked questions

Is R-410A banned in 2026?

No. R-410A can still be produced and imported under EPA allowances, used to service existing systems, and installed in new systems whose specified components were all made or imported before January 1, 2025. New systems built from 2025-or-later components need a refrigerant with a GWP of 700 or less.

Did EPA extend the January 1, 2026 R-410A install deadline?

EPA removed it. The final rule signed May 21, 2026 and effective July 27, 2026 allows pre-2025 residential and light-commercial AC and heat pump equipment to be installed until supply runs out.

Can I put R-410A in an R-454B system, or convert an R-410A system to R-454B?

No. Don't mix refrigerants or top off with a different one. EPA lists R-454B for new equipment only, not as a retrofit for existing R-410A systems.

Do technicians need a special certification for R-454B?

Federally, EPA Section 608 certification covers R-454B. There is no separate federal A2L card, but manufacturers and training groups offer A2L courses, and some jurisdictions or employers require them.

Can I replace just the condenser on an R-410A system?

Yes. Components used to repair existing systems are not restricted, and EPA's May 2026 rule left the treatment of replacement condensing units unchanged.

What is the GWP of R-454B?

EPA's SNAP list gives R-454B a GWP of 470, R-32 675 and R-410A 2,090.

Put it to work this week

Put repair, condenser and full A2L replacement options on one quote the customer can sign from their phone. CrewRobin is free until your first 10 booked jobs, no card up front. Start free or see pricing.

Sources

Figures from outside CrewRobin were checked against these pages in October 2026. Most industry benchmarks come from vendors and agencies, so treat them as ranges, not rules.

#hvac #refrigerants #compliance #guides