The R-454B refrigerant transition: what the EPA rule means for AC replacements, and how to market them honestly

"R-410A is banned, so you need a new system before it's too late." Some version of that line has been in HVAC ads and door hangers for two years. It is not accurate, and in 2026 it is less accurate than it was.

The refrigerant change is real, and it matters to your install crews, your suppliers and your pricing. It also gives a comfort advisor something honest to explain on an estimate. This post covers what the EPA rule says today, straight from the regulation, and how we think a replacement-focused contractor should market around it.

This is general information about federal rules, not legal or compliance advice. State and local codes can add their own requirements.

What is the R-454B refrigerant transition?

It is the move from R-410A to lower global warming potential refrigerants, mainly R-454B and R-32, in new residential AC and heat pump equipment. It comes from the EPA's Technology Transitions rule under the AIM Act, which limits new equipment to refrigerants with a GWP below 700 from January 1, 2025.

The AIM Act, enacted December 27, 2020, "mandates the phasedown of HFCs by 85 percent from historic baseline levels by 2036" and lets the EPA restrict HFCs sector by sector (EPA frequent questions). The sector rule for home AC and heat pumps is in 40 CFR 84.54.

How the three refrigerants compare, from the EPA's residential AC and heat pump substitutes table:

What does the EPA rule say about new AC and heat pump systems?

Two things. No one may manufacture or import self-contained residential AC or heat pump products using a refrigerant with a GWP of 700 or more from January 1, 2025. And field-installed central systems using such refrigerants may only be installed if all the specified components were made or imported before that date.

The rule text in 40 CFR 84.54, as current on eCFR in late September 2026:

• Paragraph (a)(1) covers products: "Effective January 1, 2025, self-contained residential and light commercial air conditioning and heat pump products using a regulated substance... with a global warming potential of 700 or greater."
• Paragraph (c)(1) covers field-installed systems, the central AC and heat pump systems most contractors install: "New residential and light commercial air-conditioning and heat pump systems using a regulated substance... with a global warming potential of 700 or greater may continue to be installed where all specified components of that system are manufactured or imported prior to January 1, 2025."

"Specified components" is defined in 40 CFR 84.52 as "condensing units, condensers, compressors, evaporator units, and evaporators." "Install" means completing the system's circuit, "including charging with a full charge."

Can you still install an R-410A system in 2026?

Yes, if every specified component was manufactured or imported before January 1, 2025. The original rule only allowed that until January 1, 2026. An EPA final rule published May 26, 2026 and effective July 27, 2026 removed the installation deadline for that older inventory.

The final rule says it "Removes the installation deadline for systems in the residential and light commercial air conditioning and heat pumps (AC/HP) subsector, where all specified components of such systems were domestically manufactured or imported before January 1, 2025," and that "This final rule is effective on July 27, 2026" (Federal Register, 91 FR 31284). The EPA lists it as a final Technology Transitions rule dated May 26, 2026 on its notices and rulemakings page.

The timeline in one place:

A caution on sources: the EPA's frequent questions page, last updated September 14, 2026, still says "Any new split system installed after January 1, 2026, must use refrigerant with a GWP less than 700" when we checked it on September 30, 2026. The regulation on eCFR and the final rule say otherwise for pre-2025 components. When a summary page and the regulation disagree, go by the regulation, and ask your distributor for manufacture dates on any R-410A equipment you are offered.

In practice, the EPA describes this inventory as "finite and decreasing," because no new R-410A equipment for new systems can be made or imported. It is a supply question for you, not a selling point.

Can homeowners still repair an existing R-410A system?

Yes. The EPA says "Homeowners can maintain and repair their systems throughout the useful life of the equipment," and a faulty component can be replaced "with a similar R-410A component." Replacing both the outdoor condensing unit and the indoor coil together counts as a new system.

From the EPA's homeowner questions:

• R-410A components made after January 1, 2025 must be labeled "for servicing existing equipment only."
• "A new system would also be installed if both the condensing unit and indoor coil are replaced together," even if the refrigerant lines stay.
• "Systems may be repaired over time," and "Factors for homeowners to consider when deciding to repair or transition to a new system using a lower-GWP refrigerant include availability of components, energy efficiency, and total maintenance costs."

That last line is the honest version of the replacement conversation. It is also the EPA's own framing, which helps when a homeowner suspects a sales pitch.

What are A2L refrigerants, and should homeowners worry?

A2L is a safety classification. Under the ASHRAE standard the EPA cites, "A" means lower toxicity and "2L" means lower flammability. R-454B and R-32 are both A2L. They are listed as acceptable for residential systems subject to use conditions, which installers must follow.

The EPA's final rule explains the classes: "'A' denotes lower toxicity," the class "1" is given to refrigerants "that show no flame propagation," and "2L" is given to refrigerants "that have lower flammability." R-410A is A1.

What that means for your team: installers need to follow the equipment manufacturer's instructions and your local code for A2L systems. What it means for marketing: do not use "flammable" to scare a homeowner away from a competitor's estimate, and do not wave away a homeowner who asks. A plain answer works: "It's a newer refrigerant classed as lower flammability. The equipment and the install are designed for it, and our techs are trained on it." Only say the last part if it is true.

What did the 2025 R-454B shortage mean for contractors?

Some contractors could not get R-454B to charge new systems. The EPA says there was enough refrigerant overall, but "challenges supplying the refrigerant in service cylinders," which caused "R-454B scarcity in some regions." It also noted that new-refrigerant installs rose sharply in 2025.

Those findings are in the final rule, and they are part of why the EPA removed the R-410A installation deadline. For marketing, the lesson is not to promise install dates you cannot keep. If your distributor is short on a refrigerant or on equipment, the day 7 follow-up text should offer a real install slot, not an invented one.

How should you market replacements around the refrigerant change?

Lead with what the homeowner cares about: an old system, rising repair bills, comfort and a fair estimate. Use the refrigerant change as an explanation on the estimate, in the EPA's own terms, not as a deadline. Never say R-410A is banned, never say a working system is illegal, and never predict price spikes you cannot back up.

The Federal Trade Commission's standard is short: "Advertising must be truthful and non-deceptive; Advertisers must have evidence to back up their claims" (FTC). "R-410A is illegal now" fails the first test. "Refrigerant prices will double next year" fails the second unless you have the evidence.

The EPA says systems "may be repaired over time." A contractor who offers both options, with real numbers, earns more trust than one who pretends repair is not allowed. Many homeowners still pick replacement once they see both.

How do we write refrigerant copy for clients?

We keep refrigerant out of most ads, put a short, accurate explainer on the landing page, and give comfort advisors a one-paragraph answer sourced to the EPA. Every claim links to the regulation or the EPA's own page, and we recheck it each season, because this rule has already been amended more than once.

Where it shows up in the system:

1. Ads: the offer is the replacement. Refrigerant only appears as "new systems use R-454B or R-32" if it helps answer a question.
2. Landing page: a short "Repair or replace?" section with the EPA's framing.
3. Qualifier: the current system and age question tells your advisor what they are walking into.
4. Estimate follow-up: the day 3 text answers the refrigerant question if the homeowner asked it.

We are new to the US market and have no US client results yet. That is why we lean on primary sources: when we write "the EPA says," you can click through and check. Tampa contractors dealing with long cooling seasons will face more repair or replace calls than most. See our Tampa HVAC marketing page, and our AC replacement leads page for how the offer is built. For how rebates fit into the same estimate, read how to get more central AC installation leads.

Sam

Co-founder. Audits, strategy and media buying

Sam runs every strategy call and buys every ad. Before going HVAC-only, he ran a performance marketing agency: SEO, Meta and Google ads, CRM automation.

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