Technology Transitions Rule 2026 Update: What Changed

By Yevhen Kovalchuk · Updated October 1, 2026 · 6 min read

Short answer

On May 26, 2026 EPA published a final rule that reconsidered parts of the 2023 Technology Transitions rule under the AIM Act. Summaries of the rule report extended deadlines and temporary, higher GWP limits for several sectors, including supermarkets, remote condensing units and cold storage, with the original lower limits returning on January 1, 2032. The rule took effect on July 27, 2026; sector dates should be confirmed on EPA's pages.

The Technology Transitions rule is the part of the AIM Act that limits which refrigerants can go into new equipment. On May 26, 2026 EPA published a final rule that revises it. Law-firm and industry summaries describe the change as targeted relief: longer compliance deadlines and higher, temporary GWP limits for some sectors, while the long-term direction toward lower-GWP refrigerants stays. The final rule is reported to be effective July 27, 2026.

This article summarizes what has been reported. Because we are reading secondary summaries, use the Federal Register text and EPA’s sector page for exact dates before making a decision.

What is the Technology Transitions rule?

EPA finalized the original rule in 2023. It sets a maximum global warming potential (GWP) for new equipment in each sector, such as residential air conditioning, supermarket refrigeration, cold storage, chillers and others, with dates by which products must comply. The goal is to move the market to lower-GWP refrigerants along with the HFC phasedown described in what the AIM Act is.

What did EPA change in May 2026?

EPA proposed relief in October 2025 and largely finalized it in May 2026 (91 Fed. Reg. 31284). Reported changes include:

Sector	Reported change
Supermarket systems	Interim GWP limit of 1,400 for new installations from January 1, 2027, instead of 150 or 300
Remote condensing units	Interim limit of 1,400, reported as effective from July 27, 2026
Cold storage warehouses	Interim limit of 700 from the rule’s effective date through January 1, 2032
Refrigerated lab centrifuges and shakers	Compliance date moved to January 1, 2028
Semiconductor equipment chillers (100 lb or less)	Restrictions apply from January 1, 2030
Replacement condensing units	Existing requirements maintained

Summaries report that the original limits of 150 or 300, depending on charge size and configuration, resume on January 1, 2032 for supermarket systems and similar sectors. Dates and limits can differ by subsector, so treat this table as a guide, not a compliance reference.

What about residential and light commercial air conditioning?

For residential and light-commercial AC, new R-410A equipment manufacture ended on January 1, 2025 under the original rule. Reports on the installation deadline for equipment made before 2025 differ; some summaries say the amended rule lets pre-2025 equipment be installed until existing inventory runs out, while others describe the earlier January 1, 2026 installation date. Check EPA’s sector page. Our guide to the R-410A phase-out timeline covers what is clear and what is not.

Which refrigerants fit the interim limits?

Supermarkets, 1,400 GWP. R-448A and R-449A have GWPs of about 1,300 to 1,400 depending on the assessment report, so they sit at or just under the line. Check the GWP basis EPA uses before specifying. See R-404A replacement options.
Cold storage, 700 GWP. Reports say R-448A and R-449A do not meet a 700 limit, so lower-GWP options such as CO2, ammonia or A2L blends are needed for that sector.
CO2 (R-744) and ammonia (R-717). Not HFCs; not affected by the GWP limit but covered by other safety rules.

What has not changed?

The HFC phasedown schedule under the AIM Act, including the 85% reduction by 2036, is set in statute.
Leak repair and reclaim requirements from the management rule continue.
A2L refrigerants and the codes that go with them remain the direction for comfort cooling; see A2L refrigerants explained.

What should owners and designers do?

Do not assume a deadline moved without checking the sector. Relief was targeted, not blanket.
Check the effective date of your project. The rule date, equipment manufacture date and installation date can each matter.
Specify for the long term. The original limits return in 2032, so equipment installed under an interim limit may face lower-GWP expectations within its lifetime.
Ask for manufacturer statements. Equipment makers state which refrigerants and dates apply to each model.
Keep records. Document the equipment date and charge for each installation.

Is there more to come?

EPA has also proposed other changes that were not finalized in this rule, such as leak repair exemptions for transport refrigeration, according to law-firm summaries. Rules can change again, so check the EPA pages when you plan.

How should the rule shape equipment decisions?

Treat the rule as a design input rather than a surprise. For a new refrigeration or chiller project:

Ask the manufacturer which refrigerant options exist for the product line and what the charge size is.
Compare lower-GWP choices on safety class, efficiency and component availability; R-290 propane refrigeration and CO2 transcritical systems are two natural-refrigerant paths worth understanding.
For supermarket and retail refrigeration, review GWP limits and options.
Check the date conventions carefully: the rule applies by manufacture or import date for certain equipment, so installing existing stock may follow different rules from ordering new equipment. Verify the details at epa.gov.
Record the refrigerant decision in the project file so future operators know what was chosen and why.

For existing equipment, nothing in this article requires replacement; the practical task is to know your inventory. See also HFC deadlines in January 2027.

Frequently asked questions

When did the revised rule take effect?

Summaries report July 27, 2026 for the final rule published May 26, 2026.

Did EPA cancel the 2032 limits?

No. Reports say the original 150 or 300 GWP limits return on January 1, 2032 for affected sectors after the interim limits end.

Does the update change the AIM Act phasedown?

No. The phasedown schedule is set by Congress.

SpecServis follows these rules as we plan to enter the Central Texas market. We are hiring and looking for partners. See our open positions or partnership options.