Since January 1, 2026, any commercial refrigeration appliance holding 15 pounds or more of an HFC refrigerant with a GWP above 53 is covered by federal leak repair rules. Every time refrigerant is added, the owner has to calculate the leak rate. If it comes out above 20%, the owner has 30 days to find and repair the leaks and verify the repair, or 30 days to write a plan to retrofit or retire the system and one year to carry it out.
Those rules come from EPA's Emissions Reduction and Reclamation program under the AIM Act, codified at 40 CFR Part 84, Subpart C. They are not the older Section 608 rules, and the difference matters. Section 608's leak repair requirements apply to ozone-depleting refrigerants in appliances of 50 pounds or more. The HFC program covers the R404A racks, walk-ins, and display case systems that make up most of the installed base, and it starts at 15 pounds.
What follows is the rule from a service contractor's point of view: which equipment is in scope, how the leak rate is calculated, what the 30-day clock requires, what verification and follow-up inspections look like, and which plan and reporting obligations apply when a system can't be fixed.
Two Programs, One Threshold
Commercial refrigeration now sits under two separate federal leak repair programs, and which one applies depends on the refrigerant in the system.
The Section 608 program covers ozone-depleting substances, meaning CFCs and HCFCs such as the R22 still running in older supermarket racks. It applies to appliances with a full charge of 50 pounds or more and uses a 20% trigger for commercial refrigeration, per EPA's Section 608 leak repair requirements.
EPA did extend Section 608 leak repair to HFC substitutes in 2016, then withdrew that extension in 2020. The March 2020 Federal Register rule rescinded the leak repair and maintenance provisions for appliances using substitute refrigerants. From 2020 through the end of 2025, a supermarket running R404A had no federal leak repair obligation at all.
The AIM Act program closed that gap. EPA finalized its HFC management rule in October 2024 (listed on EPA's page of regulatory actions for managing HFC use and reuse), and its leak repair requirements took effect January 1, 2026.
| Program | Refrigerants covered | Charge floor | Commercial refrigeration trigger |
|---|---|---|---|
| Clean Air Act Section 608 | Ozone-depleting refrigerants such as R22 | 50 lb | 20% |
| AIM Act, 40 CFR Part 84 Subpart C | HFCs and substitutes with GWP above 53 | 15 lb | 20%, effective January 1, 2026 |
Sources: EPA Section 608 leak repair requirements; EPA's January 2026 fact sheet on leak repair under 40 CFR Part 84.
The trigger percentage is the same under both programs. The charge floor is where things change. Equipment below 50 pounds, which was never in scope before, is now covered if it runs on an HFC.
Which Equipment Falls Under the 15-Pound Rule
EPA's January 2026 leak repair fact sheet sets applicability at appliances with "a full charge of 15 pounds or more of a refrigerant that contains an HFC or substitute," and excludes substitutes with a GWP of 53 or below. It also carves out the residential and light commercial air conditioning and heat pump subsector entirely.
For commercial refrigeration, the regulation defines the category as appliances "used in the retail food and cold storage warehouse subsectors." The definitions in 40 CFR Part 84, Subpart C name supermarkets, convenience stores, restaurants, and perishable goods storage. In practice, a lot of equipment that never had a federal obligation is now covered:
- Supermarket rack systems on R404A, R407A, R448A, R449A, or other HFC blends, which were well above 50 pounds all along but were outside the program between 2020 and 2026.
- Walk-in coolers and freezers on remote condensing units at 15 pounds or more. ACHR News coverage of the change specifically calls out walk-ins and medium-temperature display cases as newly swept in.
- Restaurant refrigeration built on remote condensing units, where a single walk-in plus a line of reach-ins on one condensing unit can clear 15 pounds.
- Cold storage of any size above the floor.
Two scoping points get missed. First, the threshold is the appliance's full charge, which the regulation defines as the amount of refrigerant "required for normal operating characteristics and conditions," determined from manufacturer specifications, calculation, measurement, or an established range. Pounds currently in the system don't count, and neither does the size of the last recovery. Second, the GWP floor of 53 means CO2 and hydrocarbon systems are out of scope, and every common HFC or HFO/HFC blend used in supermarket and walk-in work is in.
What the rule does not cover
Systems below 15 pounds are outside the program no matter the refrigerant. So is equipment in the residential and light commercial AC subsector. EPA has also proposed exempting road and intermodal container transport refrigeration units entirely: a May 2026 Federal Register proposal says those units were never meant to be covered. That is a proposal, not a final rule, and it doesn't touch stationary commercial refrigeration.
The Thresholds by Appliance Category
The AIM Act program assigns one trigger per category. Because the category decides which number applies, a mixed-use facility needs each appliance classified correctly.
| Category | Trigger rate | Where you meet it |
|---|---|---|
| Industrial process refrigeration | 30% | Food processing, chemical and manufacturing process cooling |
| Commercial refrigeration | 20% | Retail food and cold storage warehouse equipment |
| Comfort cooling, refrigerated transport, and other appliances | 10% | Building chillers and other covered equipment outside the first two categories |
Thresholds as published in EPA's January 2026 fact sheet on leak repair under 40 CFR Part 84.
A grocery store with a rack serving its cases and a separate chiller serving its sales floor is working under two different thresholds on the same property. The rack triggers at 20% and the chiller at 10%. A food processor with a blast freezer in the back and a walk-in for finished goods may be split between industrial process refrigeration and commercial refrigeration.
Every Charge Event Is a Calculation
The operational core of the rule is simple. Each time refrigerant is added, the owner calculates a leak rate. Under 40 CFR 84.106, calculations occur "every time refrigerant is added to an appliance unless the addition is made immediately following a retrofit, installation of a new refrigerant-containing appliance, or qualifies as seasonal variance."
That turns every service ticket with a charge line into a compliance document. The tech who adds four pounds to a rack on a Friday night has started a calculation the owner is required to complete.
The regulation allows two methods, and the owner must use one of them consistently.
The annualizing method
This method projects the loss since the last addition out to a full year:
(pounds added ÷ full charge) ÷ (days since last addition ÷ 365) × 100
It responds fast to sudden leaks. A 1,200-pound rack that takes 25 pounds 30 days after its previous addition works out to about 25% annualized, which is over the trigger. The same 25 pounds after 200 days is under 4%. When there is no prior addition on record since the rule took effect, the regulation says to use 365 days as the interval.
The rolling average method
This method sums the actual additions over the past year:
(pounds added in the previous 365 days ÷ full charge) × 100
It reflects the real mass lost and smooths out one-off events, so a single large addition after a long quiet stretch is less likely to trigger it. Its drawback is the reverse of the annualizing method: a leak that starts slowly can run for months before the running total crosses 20%. On first use, the regulation has you count additions made since January 1, 2026.
Pick a method on purpose, and make sure everyone who services the facility uses the same one. Switching back and forth to get a better number is not allowed; the regulation allows a change essentially only when a facility is acquired from an owner who used the other method. Get Freon's article on how long a system should hold its refrigerant charge goes through the annualizing arithmetic in more detail, using comfort cooling examples.
Seasonal variance
Many condensers with head-pressure control need more charge in winter and less in summer. The regulation defines seasonal variance as removing refrigerant because of a change in ambient conditions, followed by adding back an equal or lesser amount within 12 months. An addition that qualifies does not trigger a calculation. Document the removal when it happens; a matching addition with no record of the removal looks exactly like a leak.
What Happens When a System Crosses 20%
Once a calculation comes out above the trigger, the owner has two options, and 30 days to act on either one. The deadline is 120 days if repairing requires an industrial process shutdown.
Repair. Identify and repair the leaks within 30 days. A certified technician performs the leak inspection, and the repairs must bring the leak rate below the trigger. Finding one leak is not enough if the system has several; the repair has to account for the rate.
Retrofit or retire. If repair isn't practical, the owner writes a plan within 30 days to retrofit or retire the appliance and completes it within one year. This is the route behind the "mandatory retirement" headlines. It is available by choice, and it becomes the outcome when the repair and verification steps can't be completed.
The clock starts when the calculation shows an exceedance, not when someone gets around to looking at the numbers. That is why the calculation has to be done at the time of the charge event rather than rebuilt at month's end from invoices.
Verification Tests: Initial and Follow-Up
A repair isn't complete until verification tests confirm it. The rule requires two, and EPA's fact sheet specifies both.
The initial verification test is done within the 30-day repair window and shows that the repaired leaks have held. The follow-up verification test comes within 10 days of a successful initial test, or within 10 days of the appliance reaching normal operating characteristics. It confirms that the repair holds under running conditions.
A common failure mode in practice is a repair that passes a standing pressure test with the circuit isolated and then leaks again under operating pressure and vibration. The two-test structure is meant to catch that. For a working sequence on proving a leak repair, Get Freon's guide to checking whether a refrigerant leak was properly fixed lays out the field steps; the regulatory tests sit on top of that same good practice.
Record each test: date, method, the technician who performed it, and the result. An undocumented verification test is, for audit purposes, a test that did not happen.
Leak Inspections After the Repair
A system that has exceeded the trigger and been repaired stays under periodic inspection afterward. Under 40 CFR 84.106, the schedule depends on charge size:
- 500 pounds or more — commercial or industrial process refrigeration: inspection once every three months after the successful follow-up verification, until the appliance goes four quarters in a row without exceeding its leak rate.
- Under 500 pounds — commercial or industrial process refrigeration, and comfort cooling: inspection once a year, until the appliance goes a full year without exceeding.
For a typical supermarket rack, that means a system that crosses 20% once commits the owner to quarterly inspections for at least a year afterward. Those are scheduled visits that belong in the service agreement and the quote. The regulation allows periodic inspections to be skipped where a compliant automatic leak detection system is in use, which is one reason ALD can pay for itself on large systems even where it isn't mandatory.
Extensions, Mothballing, and What Pauses the Clock
The 30-day window has a few defined release valves. None of them works retroactively.
Parts unavailable. When a necessary component can't be obtained, the deadline extends to 30 days after the part is delivered, with an overall cap of 180 days. EPA must be notified within the original deadline. An extension that is requested after the 30 days have run out isn't available.
Other regulatory conflicts. Extensions also exist where other federal, state, or local requirements prevent the repair from being completed in time, and for radiological contamination. Neither comes up often in retail food.
Mothballing. When an appliance is evacuated to at least atmospheric pressure and temporarily shut down, the regulation suspends the timelines. The clock resumes the day refrigerant is added again. That works for a store closing a department or a seasonal operation, but it is a shutdown, not a way to keep a leaking system running.
When a Repair Will Not Hold: Retrofit or Retirement Plans
When the repair path fails, or the owner decides up front that an aging system isn't worth repairing, the retrofit-or-retirement plan is what remains. The regulation specifies its minimum contents: identification and location of the appliance, the current and proposed refrigerant type and charge, an itemized procedure for the conversion, what happens to the recovered refrigerant, and a completion schedule of no more than one year. The plan must be signed by an authorized company official, dated, and kept accessible at the site on paper or electronically.
For a retrofit, the refrigerant choice is an engineering decision tied to the specific system, not a matter of what is on the shelf. On R404A supermarket and walk-in equipment, lower-GWP HFO/HFC blends are the usual candidates. Chemours' R449A retrofit guidelines for R404A and R507 systems state that the POE lubricant already in the system "should be suitable" in most cases, call for an initial charge of about 85% of the original by weight, and list a GWP of 1,282 against 3,943 for R404A, both on the IPCC AR5 basis. The same guidelines note modestly higher discharge temperatures and a meaningful temperature glide. That means checking compressor limits with the manufacturer, charging liquid correctly, and resetting TXV superheat against dew-point values. Those details belong in the plan's itemized procedure.
The plan has to name a specific refrigerant and charge, so confirm supply before signing a one-year schedule. Systems staying on their original charge through the repair window are serviced from a 24LB R404A refrigerant cylinder. The common retrofit targets are available as a 25LB R448A refrigerant cylinder and a 25LB R449A refrigerant cylinder. When a plan covers several appliances on different refrigerants, the full refrigerant lineup at Get Freon lets you compare options and check available cylinder sizes before ordering. For quantity planning on multi-system jobs, Get Freon's guide to estimating R404A orders from confirmed service jobs covers the practical side.
Retirement plans have a regulatory backdrop of their own. EPA's Technology Transitions rule sets GWP limits for newly installed systems, and a May 2026 final revision summarized by Holland & Knight pushes the final 150/300 GWP targets for supermarket systems and remote condensing units to January 1, 2032, with an interim 1,400 GWP limit until then. For cold storage warehouses the interim limit is 700 GWP. A replacement system specified in a retirement plan has to meet whatever limit applies on its install date, so check the current rule for the specific equipment type before drafting.
Retrofit and recovery work requires appropriate EPA Section 608 technician certification, and a retrofit refrigerant must be acceptable for the specific end use. Refrigerants are never mixed and never topped off across types.
Chronically Leaking Appliances: The 125% Report
At the far end of the scale, the rule adds a reporting obligation. Per EPA's fact sheet, an appliance that leaks "125 percent or more of the full charge in a calendar year" has to be reported to EPA by March 1 of the following year.
At 125%, the system lost more than its entire charge in twelve months. A rack reaching that number has usually been on a top-off cycle while repairs failed or never happened. The report brings the system to EPA's attention by name, so the practical goal is never to reach it. If a system is anywhere near that level, the repair path has already failed, and a retrofit-or-retirement plan should be written immediately.
Automatic Leak Detection for Large Systems
The rule separately requires automatic leak detection on the largest systems. According to the International Code Council's summary of the program, new commercial and industrial process refrigeration appliances with a full charge of 1,500 pounds or more that contain an HFC or substitute with GWP above 53 must have ALD installed within 30 days of installation, effective January 1, 2026. Existing systems of that size installed between January 1, 2017, and January 1, 2026 must have ALD by January 1, 2027.
That 2027 deadline is about three months away. Any large distribution-center or big-box rack installed in the past nine years should already have an ALD project scheduled. Below the 1,500-pound threshold ALD is optional, but because a compliant system can replace periodic inspections, it is worth pricing on any system that has already gone onto a quarterly inspection schedule.
The same program also sets rules for reclaimed refrigerant. Reclaimed HFCs are limited to no more than 15% virgin content by weight as of January 1, 2026, and certain servicing, including supermarket systems, must use reclaimed refrigerant starting January 1, 2029, per the ICC summary. Supermarket owners planning service budgets beyond 2028 should take that into account.
Recordkeeping That Survives an Audit
EPA's fact sheet requires records to be kept for three years, on paper or electronically. In practice, the record for each covered appliance needs:
- the full charge and how it was determined;
- every refrigerant addition, with date, pounds, technician, and the leak rate calculated at that addition;
- the calculation method in use;
- documented seasonal variance removals;
- leak inspection results, repairs made, and both verification tests;
- any extension notifications and mothballing dates;
- retrofit or retirement plans, signed and dated;
- ALD records where applicable.
The service contractor usually produces most of this, and the owner is responsible for keeping it. The gap between the two is where compliance fails: a ticket that says "added 18 lb R404A, leak checked OK" gives the owner none of what the regulation asks for. Service companies that deliver a compliant record on every charge event give owners something they need, and they avoid the question of who was supposed to calculate the leak rate on the night of the addition.
State Rules That Sit on Top
The federal rule sets a minimum. Several states run their own refrigerant management programs, and ACHR News reporting notes that California, Washington, and New York impose stricter requirements than the federal baseline in areas such as repair windows, leak thresholds, and record retention. Contractors working multi-state accounts should treat the federal requirements as the floor and confirm each state's program separately; in those states, a store that meets the federal clock can still be out of compliance.
Frequently Asked Questions
What are the leak rate thresholds for commercial refrigeration?
20% under both the AIM Act HFC program and the Section 608 program for ozone-depleting refrigerants. Industrial process refrigeration triggers at 30%, and comfort cooling and other appliances at 10%.
Do HFC leak repair rules apply to systems under 50 pounds?
Yes, down to 15 pounds. The AIM Act program starts at a full charge of 15 pounds of an HFC or substitute with GWP above 53, which brings many walk-ins, display case systems, and restaurant remote condensing units into scope for the first time.
When did the HFC leak repair requirements take effect?
January 1, 2026. Between the 2020 rescission of Section 608 leak repair for substitutes and that date, HFC appliances had no federal leak repair obligation.
Does the rule apply to R22 supermarket racks?
R22 is an ozone-depleting refrigerant, so an R22 rack falls under Section 608 rather than the AIM Act program: a 50-pound floor with the same 20% commercial refrigeration trigger.
Can a leak rate calculation be skipped?
Only when the addition immediately follows a retrofit or a new installation, or when it qualifies as seasonal variance. Every other addition to a covered appliance requires a calculation.
When can refrigerant leaks trigger mandatory system retirement?
When a leak above the threshold is not repaired and verified within the deadline, the owner must follow a retrofit or retirement plan, written within 30 days and completed within one year. The owner can also choose that path from the start instead of attempting a repair.
Is automatic leak detection required on supermarket systems?
Only on commercial and industrial process refrigeration appliances with a full charge of 1,500 pounds or more. New systems need it within 30 days of installation, and existing systems installed from 2017 through 2025 need it by January 1, 2027. On smaller systems it is optional but can replace periodic leak inspections.
Who is responsible for compliance, the owner or the contractor?
The rule places the core obligations on the owner or operator, and certified technicians carry their own duties when servicing covered equipment. In practice, the contractor generates most of the data the owner has to keep, so the service agreement should state who calculates the leak rate at each addition.
Working the Rule Into the Service Model
The 20% threshold isn't new to commercial refrigeration. What changed on January 1, 2026 is how much equipment it covers and how directly it ties to each service ticket. Every charge event on an HFC system of 15 pounds or more now means a calculation, a possible 30-day repair clock, two verification tests, and months of follow-up inspections. Contractors who build those steps into how they write tickets, schedule visits, and quote repairs will spend far less time reconstructing a leak rate from invoices when an owner gets an audit letter.
