Walk-In Refrigerant Rules in 2026: R-404A, R-448A and Leak Repair

Federal refrigerant rules changed several times between 2023 and 2026, and a lot of what circulates online is out of date. This page sets out what applies to walk-in coolers and freezers as of September 2026: what you can keep servicing, what new equipment must use, and what the leak repair rule requires of owners.

The short version

None of these rules require you to replace a working R-404A or R-22 system.

Who can work on the refrigerant system

Anyone who could reasonably be expected to break into the refrigerant circuit while servicing equipment that contains HFCs must hold EPA Section 608 certification. Walk-in systems on R-404A, R-448A and similar refrigerants fall under Type II (medium- and high-pressure appliances), so the technician needs Type II or Universal certification. Apprentices are exempt only while under close, continual supervision of a certified tech.

Refrigerant may be sold only to certified technicians or to buyers who employ one. That is one reason staff should never add refrigerant, even from a can. What staff can safely do is covered in what staff can safely check.

The HFC phasedown and what it does to supply

The AIM Act caps U.S. production and consumption of HFCs as a percentage of a historical baseline:

The phasedown does not ban any refrigerant outright. It shrinks the total supply, weighted by global warming potential (GWP), so high-GWP refrigerants like R-404A feel it most. The next big step is 2029.

Can you still service an R-404A walk-in?

Yes. EPA's Technology Transitions rule states that it does not restrict the continued use of existing systems, and that a system "may be serviced and repaired throughout its useful life; this includes replacing components." Replacement parts for existing equipment can still be made and sold. New high-GWP replacement components must be labeled for servicing existing equipment only.

What changes is the cost and availability of the refrigerant itself.

California is stricter on refrigerant sales

Under California's SB 1206 and AB 663:

• Sale or distribution of virgin bulk HFCs with GWP over 2,200 (which includes R-404A and R-507A) has been prohibited since 1 Jan 2025.
• The threshold drops to GWP over 1,500 from 1 Jan 2030, and over 750 from 1 Jan 2033. The 2033 step reaches R-448A and R-449A territory.
• Refrigerant reclaimed by an EPA-certified reclaimer is exempt.

So a California R-404A walk-in can still be serviced, but only with reclaimed refrigerant.

Rules for new walk-in refrigeration systems

EPA's Technology Transitions rule sets GWP limits on refrigerant in new equipment. EPA revised the limits in a final rule published 26 May 2026, effective 27 Jul 2026 (Federal Register).

For retail food remote condensing units (the type with a separate condensing unit that most walk-ins use):

• From 27 Jul 2026, new installations may not use refrigerant with GWP of 1,400 or higher.
• From 1 Jan 2032, the limit becomes GWP 150 for systems with a charge of 200 lb or more, or GWP 300 for systems under 200 lb.

EPA's preamble notes that R-448A and R-449A are already used in new remote condensing unit installations and fall below the 1,400 limit.

Self-contained walk-ins: retail food stand-alone units have been limited to GWP below 150 since 1 Jan 2025. Whether a particular self-contained or packaged walk-in system counts as a "stand-alone unit" or a "remote condensing unit" under EPA's definitions is not clear-cut. If you are buying a self-contained system, ask the manufacturer or installer which category it falls under and which refrigerant limit applies.

Approximate GWP of common walk-in refrigerants

Values below are calculated with EPA's method; published figures vary slightly by source.

What counts as a "new installation"

This matters more than most owners realize. Under the rule, a system becomes a new installation, and must meet the limits, when it is charged to full charge after:

• being assembled for the first time from new or used components;
• having its cooling capacity increased by any amount (for system types other than supermarket systems, which have a 15% threshold); or
• having 75% or more of its evaporators replaced along with all racks, condensers and connected loads.

In plain terms: if you upsize a walk-in's condensing unit, expect it to be treated as a new installation that cannot use R-404A. Like-for-like repairs on an existing system are servicing.

A2L refrigerants

The lowest-GWP options for new systems, such as R-454A, R-454C and R-455A, are classed A2L, meaning lower toxicity and lower flammability. EPA accepted them for new remote condensing units under conditions, including equipment built to UL 60335-2-89 and installed per ASHRAE 15-2022, with R-454A limited to systems under 200 lb. Equipment built for A2L refrigerants includes leak detection: HTPG's A2L manual, for example, requires a leak detector in the unit cooler that closes safety shut-off valves and runs the fans continuously. Heatcraft's current manual offers these A2L refrigerants with outdoor condensing units only. For leak safety in an enclosed box, see refrigerant leak safety.

Leak repair: the rule that applies to owners now

EPA's Emissions Reduction and Reclamation (ER&R) rule has applied since 1 Jan 2026. It places obligations on owners and operators, not only on technicians.

Does it apply to your walk-in?

It covers appliances with a full charge of 15 lb or more of an HFC, or of a substitute with GWP above 53. Many small walk-ins hold less than 15 lb, so check the nameplate or ask your technician. Systems that contain only an ozone-depleting refrigerant such as R-22 are excluded from this rule; the older Section 608 leak repair rule applies to those only at 50 lb or more.

What it requires

Walk-ins used in retail food or cold storage fall under commercial refrigeration, which has a 20% annual leak rate trigger. When refrigerant is added, the leak rate must be calculated. If it exceeds 20%:

1. A certified technician must find and repair the leak within 30 days.
2. Initial and follow-up verification tests are required.
3. If the leak is not fixed, a retrofit or retirement plan is due within 30 days, and the work must be completed within one year (extensions are possible).
4. Ongoing leak inspections are required. For commercial systems of 15 to 499 lb, that is annually.

Records you need

• Full charge: owners had to determine and record each covered appliance's full charge by 1 Jan 2026, or at installation for newer systems.
• Service records, including refrigerant added and removed.
• Keep records for at least three years.

Ask your technician to give you a copy of every service record that shows refrigerant added. See refrigerant leaks and recharging for why repeated top-offs are costly even when the rule does not apply.

Tip: The only change EPA proposed to this rule in 2026 was an exemption for transport refrigeration units. The walk-in requirements were not delayed.

Two more ER&R dates

• Reclaimed refrigerant for servicing (from 1 Jan 2029) applies only to supermarket systems, refrigerated transport and automatic commercial ice makers. It does not apply to stand-alone walk-ins or remote condensing units.
• Disposable cylinders must be sent for heel removal starting 1 Jan 2028. This mainly affects contractors.

R-22 walk-ins

R-22 production and import ended 1 Jan 2020, and all HCFC production ends in 2030. EPA states that it "does not require replacement of an existing HCFC-22 system." An R-22 walk-in can keep running, but it can be serviced only with recovered, reclaimed or previously produced R-22 (EPA). Given its age and a shrinking supply, most R-22 walk-ins are good candidates for the repair or replace conversation.

What this means for your next decision

• Repairing an existing system: allowed, whatever the refrigerant. Budget for rising refrigerant costs on R-404A.
• Changing refrigerant in an existing system: see retrofitting an R-404A walk-in.
• Replacing a condensing unit, especially if upsizing: plan on a refrigerant below GWP 1,400, such as R-448A or R-449A. The compressor replacement cost page compares that path with a compressor swap. JayComp specifies and installs new condensing units that meet the current limits.
• Choosing a contractor: confirm Section 608 certification and ask how they track leak rates. See hiring a refrigeration technician.

This page summarizes federal rules and California's sales restrictions as of September 2026. It is not legal advice, and other states may have their own rules.