EPA Leak Repair and Low-GWP Rules for Commercial Refrigeration

A lead technician on commercial refrigeration has to know the rules as well as the system. The law decides whether a leak must be fixed in 30 days, what you must write down, and what you can install in a new store. Those rules changed in 2026. This covers the federal rules as of late 2026, and they will keep changing. EPA fact sheets summarize them, but the regulations in 40 CFR Parts 82 and 84 are what count. Some states go further, and a stricter state rule applies on top of the federal one. It is not legal advice, so check the current text and your employer's compliance process before you commit to a date.

What You Will Be Able to Do

• Decide which federal leak program covers a system.
• Calculate an annual leak rate and compare it with the limit.
• List the deadlines that start when a leak is over the limit.
• Explain the reclaim and cylinder rules that are coming.
• Plan a replacement around current GWP limits and flammable refrigerants.

Two Rulebooks

Which program applies depends on the refrigerant in the system.

A technician still needs Section 608 certification to buy and handle these refrigerants. EPA has no separate A2L certification.

Three questions decide whether Part 84 leak repair applies:

1. Is the full charge 15 lb or more?
2. Does the refrigerant contain an HFC, or a substitute with a GWP above 53?
3. Is the appliance outside the residential and light commercial air conditioning and heat pump subsector?

If all three answers are yes, the rules apply. R-404A, R-448A, R-449A, R-134a and R-454C fall in. Carbon dioxide (R-744), propane (R-290) and ammonia (R-717) fall out, because their GWP is 53 or below. Their other hazards still apply in full.

Leak Rate Limits

The limits are the same in both programs.

So a covered commercial refrigeration system must be repaired when it leaks at a rate above 20% a year.

Calculating the Leak Rate

A leak rate calculation is required each time refrigerant is added, with limited exceptions. The owner or operator picks one of two methods and stays with it unless the rules allow a change. The method shown here is the annualizing method. The other is the rolling average method.

Formula: (pounds added divided by full charge) x (365 divided by days since the last addition) x 100. If the last addition was over 365 days ago, use 365.

Worked example: a grocery store's walk-in system holds 120 lb of R-448A. You add 8 lb, and the last addition was 61 days ago.

1. 8 divided by 120 = 0.0667.
2. 365 divided by 61 = 5.98.
3. 0.0667 x 5.98 x 100 = about 39.9%.
4. That is above 20%, so the repair clock has started.

Eight pounds does not sound like much. Time between additions is what pushes the rate up, which is why accurate dates matter as much as accurate weights.

What Happens Over the Limit

The quarterly inspections continue until the leak rate stays under the limit for four quarters in a row. The annual inspections continue until it stays under the limit for a year. Extensions exist in some cases, but they have conditions and may need a notice to EPA. Do not promise one to a customer.

A repair only has to bring the leak rate below the limit. Good practice is to find and fix every leak you can, because a repair that only just passes will fail again.

Who Owns Which Job

The owner or operator carries most of these duties. Your paperwork feeds theirs, so give them what they need on every visit:

• The date and the pounds added.
• The refrigerant, and the system or circuit it went into.
• The location of the leak, and the repair made.
• The verification test and its result.
• Your name.

Never add refrigerant and leave without this record. A top-off with no record leaves the owner open to a violation and leaves the next technician guessing.

Automatic Leak Detection

Large systems must have an automatic leak detection system. It applies to commercial and industrial process refrigeration appliances with a full charge of 1,500 lb or more of a covered refrigerant.

• New installs since January 1, 2026: within 30 days of installation.
• Installed from January 1, 2017 to the end of 2025: by January 1, 2027.

Treat a leak alarm as real until you prove otherwise. Silencing it without a record is a compliance problem as well as a service problem.

Reclaim and Cylinder Rules

• Since January 1, 2026, HFC sold as reclaimed may contain no more than 15% virgin HFC by weight.
• From January 1, 2029, servicing and repair of supermarket systems, refrigerated transport and automatic commercial ice makers must use reclaimed HFC.
• From January 1, 2028, used disposable cylinders must go to a reclaimer or another listed handler, or be evacuated to 15 inches of mercury vacuum by a certified technician with a certification statement.

GWP Limits for New Equipment

Global warming potential, or GWP, compares a gas's heat-trapping effect with carbon dioxide at 1. EPA's Technology Transitions rule limits GWP in new equipment, and a final rule effective July 27, 2026 changed several limits.

From January 1, 2032, supermarket, remote condensing and cold storage limits step down to 150 or 300, depending on charge size and configuration. A supermarket system's capacity can grow by up to 15% without it counting as a new system.

R-404A, at about 3,922, is out for these new systems. R-448A and R-449A, at about 1,400, can meet the interim 1,400 limit, but not the 2032 limits. A store planned today with a long life ahead should weigh that date. These limits apply to new equipment. An existing system can keep running and be repaired with the refrigerant it was built for, and the HFC phasedown means supply and price will keep tightening.

The AIM Act directs an 85% cut in HFC production and consumption by 2036.

Flammable and High-Pressure Refrigerants

Limits of 150 and 300 GWP push commercial refrigeration toward refrigerants with new hazards.

An A2L refrigerant needs a fairly strong ignition source and a high enough concentration to burn, so keep open flames and sparking devices out of the area where a leak could collect. A walk-in box is a small, sealed room, so think about where a leak would go.

UL 60335-2-89 is the product safety standard for commercial refrigerating appliances, and ASHRAE 15 and local fire and mechanical codes set room and charge rules. Which edition applies depends on what your state or city has adopted. The manufacturer's instructions control the work on each model.

Retrofit or Replace

There is no drop-in for an existing system. A retrofit from R-404A to R-448A or R-449A is common, because all are A1, non-flammable, but it still needs a check of the oil, TXV, controls and labels. A retrofit changes glide, so your superheat readings need the right chart.

Never convert an A1 system to an A2L or A3 refrigerant unless the equipment maker allows it and EPA's SNAP program lists it for that use. A1 equipment has not been built or tested for flammable refrigerant.

When a leaking system reaches the retrofit or retirement stage, compare the repair history, the age of the system, the coming GWP step-down, and how the owner plans to use the store. You supply the facts, and the owner makes the decision.

Common Mistakes

Check Your Understanding

A convenience store's 18 lb R-448A cooler needs refrigerant. Does Part 84 leak repair apply? Yes, if the charge is 15 lb or more and it is commercial refrigeration. Calculate the leak rate.

A 60 lb R-744 system leaks. Does the Part 84 leak repair program apply? No. Its GWP is 1, which is not above 53.

You add 5 lb to a 100 lb commercial system, 73 days after the last addition. What is the leak rate? (5 / 100) x (365 / 73) x 100 = 25%. That is above 20%.

A store owner wants a new remote condensing unit on R-404A this year. What do you say? No. New remote condensing units are limited to 1,400 GWP.

A leak repair passes the initial verification test on Monday. When is the follow-up test due? Within 10 days of that good test, or of the system's return to normal operation.

Key Takeaways

• Part 82 covers ozone-depleting refrigerants at 50 lb, and Part 84 covers HFCs and certain substitutes at 15 lb.
• Limits are 30% for industrial process refrigeration, 20% for commercial refrigeration and 10% for comfort cooling and others.
• Repair within 30 days, and do both verification tests.
• Give the owner complete records on every visit, because the leak rate depends on them.
• Interim GWP limits end January 1, 2032, so plan new work around that date.
• Never convert an A1 system to a flammable refrigerant without the maker's approval and a SNAP listing.