R-410A vs the new refrigerants

At a glance

Sources: NAHB summary of the EPA final rule (May 2026); EPA AIM Act Technology Transitions program; US EPA, GreenChill regulatory context (archived page). Federal rules change; check the current EPA position before relying on any date here.

What changed, in plain terms

Equipment made or imported since 1 January 2025 uses lower-GWP A2L refrigerants (R-454B or R-32) instead of R-410A. An EPA rule finalized in May 2026, effective 27 July 2026, removed the 1 January 2026 cutoff, so contractors may install pre-2025 R-410A systems until that stock runs out.

The switch is driven by the federal AIM Act, which phases down hydrofluorocarbons (HFCs) with a high global warming potential (GWP). R-410A is one of those. R-454B and R-32 do the same job in an air conditioner with a much lower climate impact if they leak.

For a homeowner the practical effect is simple: a system quoted in 2026 will use either a new A2L refrigerant or older R-410A stock, and the two are not interchangeable. The refrigerant on your quote decides which coil, which parts and which service supply the system will need for its whole life.

The refrigerants you will see on quotes

The "about" years are approximate transition periods, not rules. The data plate on the outdoor unit names the refrigerant; check yours before talking to a contractor.

What "A2L" means, and whether it should worry you

Refrigerants are classed by toxicity (A is lower) and flammability (1 is none, 2L is lower flammability, 3 is high). R-410A is A1. R-454B and R-32 are A2L: hard to ignite and slow-burning, but not completely non-flammable.

That is why equipment built for A2L refrigerants includes design changes such as leak detection in many indoor units, and why installation codes and manufacturer instructions add requirements for A2L systems. Those requirements are the installer’s job to know and follow, and they are another reason the work belongs with a licensed contractor.

For a homeowner, the useful question is not "is it safe?" in the abstract but "is this system installed to the manufacturer’s A2L instructions?" Ask the contractor to confirm it, and keep the installation manual with your paperwork.

R-410A stock or a new A2L system: how to choose

There is no single right answer. If two quotes are close and both are installed well, the A2L system is the longer-horizon choice. If an R-410A system is meaningfully cheaper and you understand the repair-supply trade-off, it can still be reasonable. What matters more than the refrigerant is sizing and installation quality: ENERGY STAR material states that nearly half of heating and cooling equipment in US homes never performs to its advertised capacity and efficiency because of installation problems.

What the refrigerant change does to price

Published DFW ranges for a 3-ton central AC replacement on existing ducts run $5,500–$16,500, and 4 tons $7,500–$18,500. These are third-party published figures, not this site’s prices. Cold Factor Heating & Air (Flower Mound, TX), one of the sources behind those ranges, attributes about $700 of unit cost to the A2L change.

That figure is one contractor’s estimate, not a rule. A quote can also differ for reasons that are hard to see: whether the indoor coil is replaced, whether the line set is replaced, and whether the A2L installation needs extra parts. Ask for those lines to be shown separately.

The coil and line-set questions

An air conditioner is a matched pair: the outdoor unit and the indoor coil are rated together, and AHRI lists the combinations that have been certified. A new outdoor unit on a different refrigerant generally needs a new indoor coil designed for that refrigerant. Replacing only the outdoor unit is the most common way a "cheap" quote turns into a poorly performing system.

The line set, the pair of copper tubes between the units, is a judgment call. Some contractors reuse it after checking size and condition and flushing it; others replace it, particularly when it is buried in walls or the attic and hard to inspect. Neither is automatically wrong. Ask for the reason in writing.

Efficiency ratings also attach to the matched pair. Texas is in the DOE Southeast region. Since 1 January 2023 a split-system central AC under 45,000 BTU (about 3.75 tons) must be at least 14.3 SEER2 on the date it is installed; larger systems need 13.8. Split heat pumps need 14.3 SEER2 and 7.5 HSPF2 nationwide. An unmatched coil can leave a system below its rated efficiency.

If you still have an R-22 system

Production and import of virgin HCFC-22 (R-22) ended on 1 January 2020; existing R-22 systems may still be serviced with recovered or stockpiled refrigerant. R-22 equipment is now old; the repair-or-replace guide covers the decision.

A small repair that does not involve the refrigerant circuit, such as a capacitor or contactor, can still make sense. A leak or a failed compressor is usually the point to price a replacement, because recharging depends on a shrinking supply. Replacement means a new outdoor unit and a new coil for whichever refrigerant you choose, and often a review of the line set.

Avoid offers to convert an R-22 system to a "drop-in" substitute without a clear explanation of what it does to capacity, oil compatibility and warranty. Ask for the manufacturer’s position in writing.

Living with your choice: service over the years

An AC bought in 2026 will likely be serviced well into the 2030s, so think about the refrigerant you will be buying for repairs, not only the one in the box. The AIM Act phase-down limits how much new HFC refrigerant is produced over time, which is why the supply and price of R-410A for repairs is the main uncertainty with older stock.

Most repairs never touch the refrigerant: capacitors, contactors, fan motors and controls are the same kind of work either way. Refrigerant matters when there is a leak, a coil failure or a compressor replacement. Those are also the repairs where a homeowner most often faces a repair-or-replace decision.

• Keep the paperwork. Model numbers, the AHRI certificate, the refrigerant and charge on the data plate, and the warranty registration.
• Ask for leak checks during maintenance, so a small leak is found before a full recharge is needed.
• Ask any repair technician which refrigerant they are adding and how much, and expect it on the invoice.

Scenario: two quotes, two refrigerants

A hypothetical to show how to compare. Say a 1990s Plano two-story gets two quotes for a 3-ton replacement on existing ducts.

1. Quote A offers an R-410A outdoor unit from remaining stock with a matching R-410A coil, line set reused after a flush.
2. Quote B offers an R-454B system with a new coil and a new line set.
3. Check both against the range. Each total should sit somewhere near the published DFW band for 3 tons, $5,500–$16,500. A total far outside it deserves an explanation.
4. Normalize the scope. Quote B includes a new line set; ask Quote A what it would charge for the same, or why reuse is fine.
5. Weigh the difference. If the gap is close to the published $700 unit-cost estimate plus the line set, the quotes are priced consistently, and the choice is about refrigerant horizon versus up-front cost.
6. Confirm the essentials on both. Load calculation, AHRI number, manufacture date, permit and warranty registration.

The quote-comparison tool lays out up to three quotes side by side.

Common mistakes

1. Not asking which refrigerant is quoted. It is often buried in the model number.
2. Replacing only the outdoor unit. On a refrigerant change the coil must match.
3. Assuming R-410A is now illegal. Under the 2026 rule summarized by NAHB, pre-2025 stock may still be installed.
4. Assuming new is always worse value. The A2L premium may be modest compared with the system total.
5. Topping up an R-22 or R-410A system with a different refrigerant. Never mix refrigerants.
6. Hiring an unlicensed installer to save money. Refrigerant handling requires EPA certification, and Texas requires a TDLR license for the contractor.

Who may handle refrigerant

Under EPA’s Section 608 rules, refrigerant for these systems may be sold only to certified technicians or to employers of certified technicians. Texas licenses HVAC contractors through TDLR. Class A has no size limit; Class B covers cooling systems of 25 tons and under. Each license carries one endorsement; residential work is the Environmental Air endorsement. Contractors must hold liability insurance and renew with continuing education every year.

Check the contractor on the TDLR license lookup before signing, and confirm the city permit for the job on Dallas AC installation permits.

What to ask before you sign

1. Which refrigerant does the quoted system use, R-410A, R-454B or R-32?
2. If R-410A, when was the outdoor unit manufactured, and is the full warranty intact?
3. Is the indoor coil new and matched to the outdoor unit? What is the AHRI certificate number?
4. Will the line set be replaced or reused, and why?
5. For an A2L system: is it installed to the manufacturer’s A2L instructions, and does the indoor unit include leak detection?
6. Who on the crew holds EPA Section 608 certification?
7. Is the permit included, and who registers the warranty?

For the wider list, see questions to ask an HVAC installer.

Sources

• NAHB summary of the EPA final rule (May 2026); EPA AIM Act Technology Transitions program (retrieved 2026-09-23)
• US EPA, GreenChill regulatory context (archived page) (retrieved 2026-10-20) — verify before relying on it
• US EPA, Section 608 refrigerant sales restriction (retrieved 2026-10-20) — verify before relying on it
• AHRI, "2023 Energy Efficiency Standards"; DOE regional standards (retrieved 2026-09-23)
• ENERGY STAR HVAC fact sheet (retrieved 2026-10-20) — verify before relying on it
• Texas Department of Licensing and Regulation, Air Conditioning and Refrigeration program (retrieved 2026-09-23)
• Cold Factor Heating & Air (Flower Mound, TX) (page dated 2026) (retrieved 2026-09-23)
• HVAC Services Pro (DFW) (page dated 2026-04-13) (retrieved 2026-09-23)
• HVAC Services Pro, DFW installation guide (page dated 2026-03-06) (retrieved 2026-09-23)
• HVACProjectCost.com, Dallas page (page dated 2026-08-02) (retrieved 2026-09-23)

Questions

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