EPA AIM Act Compliance for HVAC Contractors: What the 15-Pound Rule Means for Your Business
If you run a commercial HVAC or refrigeration business in the United States, everything changed on January 1, 2026. The EPA’s AIM Act regulations — specifically 40 CFR Part 84, Subpart C — dropped the regulated system threshold from 50 pounds to just 15 pounds of refrigerant. That single change pulled thousands of rooftop units, packaged systems, and light commercial equipment into federal compliance oversight for the first time.
This guide breaks down exactly what Subpart C requires, which of your customer systems are now regulated, what documentation you need to maintain, and the specific deadlines you cannot afford to miss. If you service commercial HVAC equipment, this is the most important regulatory shift you’ve faced in a decade.
What is the AIM Act, and why does it matter now?
The American Innovation and Manufacturing (AIM) Act, signed into law in December 2020, gives the EPA authority to phase down the production and consumption of hydrofluorocarbon (HFC) refrigerants by 85% by 2036. While the production phasedown has been underway since 2022, the part that directly affects HVAC contractors — the Emissions Reduction and Reclamation Program under Subpart C — took effect on January 1, 2026.
Subpart C is essentially a modernized, expanded version of the leak repair and maintenance requirements that previously existed only under Section 608 for ozone-depleting substances. But it goes significantly further in three critical ways: it covers HFC refrigerants (not just ODS), it lowers the system size threshold dramatically, and it tightens leak rate thresholds and repair timelines.
For a contractor running 6 to 25 trucks servicing commercial buildings, grocery stores, restaurants, and office complexes, the practical impact is substantial. Systems that previously required no federal tracking whatsoever — a standard 20-pound rooftop unit, for example — now require documented leak rate calculations every single time you add refrigerant.
Which systems are now regulated?
The AIM Act’s Subpart C applies to any appliance that contains 15 pounds or more of a regulated substance with a global warming potential (GWP) above 53. In practice, this covers the vast majority of commercial HFC refrigerants that contractors encounter daily.
Commonly regulated refrigerants include: R-410A (GWP 2,088), R-404A (GWP 3,922), R-407C (GWP 1,774), R-134a (GWP 1,430), and R-507A (GWP 3,985). If your customers have commercial HVAC or refrigeration equipment using any of these refrigerants with a charge of 15 pounds or more, those systems are now federally regulated under Subpart C.
What this means in real terms: A 5-ton rooftop commercial AC unit typically holds 15–20 pounds of R-410A. A multi-head VRF system can hold 30–60 pounds. Walk-in coolers commonly hold 15–50 pounds. Display cases and rack systems hold hundreds of pounds. Under the old Section 608 rules, many of these smaller systems flew under the radar. Under the AIM Act, they are all regulated.
Notable exemptions: Residential systems containing fewer than 15 pounds and systems using refrigerants with a GWP of 53 or below (such as R-290 propane or R-744 CO₂) are exempt from Subpart C. Motor vehicle air conditioning (MVAC) is covered under separate regulations. Systems using only ODS refrigerants like R-22 remain under Section 608 only.
Before vs. after: what actually changed
Understanding what changed — and what stayed the same — is critical for contractors who already understood Section 608 obligations. Here is the practical comparison.
System size threshold went from 50 pounds under Section 608 to 15 pounds under the AIM Act. This is the single biggest change and the one that affects the most contractors.
Leak rate thresholds tightened for commercial and industrial systems. Comfort cooling remains at 10% (established under the 2016 Section 608 update), but now applies to HFC systems down to 15 pounds. Commercial refrigeration dropped from 35% to 20%. Industrial process refrigeration dropped from 35% to 30%. These lower thresholds mean more systems will trigger leak repair requirements.
Documentation requirements expanded significantly. Under Section 608, record-keeping was required but loosely enforced for many smaller contractors. Under Subpart C, every refrigerant addition to a regulated system must include a documented leak rate calculation. Records must be maintained for a minimum of 3 years and be available for EPA inspection upon request.
Leak rate calculation timing is now required every time refrigerant is added to a system, not just periodically. If you add 2 pounds of R-410A to a 20-pound rooftop unit, you must calculate the annualized leak rate at that moment and document it.
Repair timelines remain at 30 days from exceeding the applicable leak rate threshold, consistent with Section 608. However, if the repair fails a follow-up verification test, you must now develop a retrofit or retirement plan within an additional 6 months.
Chronic leaker reporting is entirely new. Systems that leak 125% or more of their full charge in a calendar year must be reported to the EPA by March 1 of the following year. This obligation did not exist under Section 608.
Automatic leak detection requirements are entirely new. Commercial and industrial refrigeration systems with charges of 1,500 pounds or more must install automatic leak detection (ALD) systems — with specific deadlines depending on when the system was installed.
The leak rate thresholds you must know
Every time you add refrigerant to a regulated system, you must calculate the leak rate and compare it against the applicable threshold. These are the numbers your business operates by.
Comfort cooling (10% annual threshold): This covers the majority of commercial HVAC systems — office building chillers, rooftop units, split systems, VRF systems, and similar equipment used primarily for human comfort. A 20-pound system exceeding 2 pounds of loss per year triggers repair requirements.
Commercial refrigeration (20% annual threshold): Walk-in coolers and freezers, display cases, ice machines, and similar equipment used to store or display food or other perishable goods. A 45-pound walk-in cooler system exceeding 9 pounds of loss per year triggers repair requirements.
Industrial process refrigeration (30% annual threshold): Process cooling systems used in manufacturing, pharmaceutical production, chemical processing, and similar industrial applications. A 500-pound industrial system exceeding 150 pounds of loss per year triggers repair requirements.
When a system exceeds its applicable threshold, a 30-day repair clock starts. Within 30 days, you must complete the leak repair and perform a verification test to confirm the repair was successful. If the verification test reveals continued leakage above the threshold, you enter a more complex retrofit/retirement planning process.
For a step-by-step walkthrough of the actual math involved, see our guide on how to calculate refrigerant leak rates.
The 30-day repair clock: what triggers it and what happens
Exceeding a leak rate threshold is not a violation in itself — the violation occurs when you fail to take required action within the specified timeframes. Understanding this sequence is essential.
Day 0: You add refrigerant to a system and your leak rate calculation reveals the annual rate exceeds the applicable threshold (10%, 20%, or 30% depending on system type).
Day 0–30: You must identify and repair the leak. The repair must be followed by a successful verification test confirming the leak rate has been reduced below the threshold. The verification test methodology and timeline depend on the type of repair performed.
If the repair succeeds: Document the repair, verification test results, and updated leak rate. Maintain records for 3 years minimum. No further action required unless the system exceeds the threshold again.
If the repair fails verification: You have an additional 6 months to develop and begin implementing a retrofit or retirement plan for the system. This plan must include a timeline for completion and must be available for EPA inspection.
If the system leaks 125%+ of full charge annually: Regardless of repairs, the system is classified as a “chronically leaking appliance” and must be reported to the EPA by March 1 of the following calendar year.
Documentation requirements: what EPA inspectors actually look for
When the EPA conducts an inspection — and they do, often triggered by whistleblower reports — they look for specific documentation. Missing any of these creates violation exposure.
Equipment records must include the type and full charge of refrigerant for each system, the date of installation, and the system location. For systems with 1,500+ pounds of charge, ALD installation and calibration records are also required.
Service records must document every refrigerant addition including the date, the amount added, the cumulative amount added since the last successful leak repair, and the calculated leak rate. Records must also show the name and contact information of the servicing technician.
Repair records must include the date the leak rate threshold was exceeded, the date the repair was completed, the repair method used, the date and result of the verification test, and — if the repair failed — the retrofit or retirement plan with its implementation timeline.
Retention period: All records must be maintained for a minimum of 3 years from the date of creation and must be made available to EPA within 5 business days of a request.
The reality for a contractor managing 100–500 pieces of equipment across multiple customers is that maintaining this documentation manually — in spreadsheets or paper logs — becomes exponentially more difficult under the 15-pound threshold. Every rooftop unit service call now generates compliance documentation requirements. This is precisely the problem that refrigerant tracking software is designed to solve.
Penalties for non-compliance: the numbers that matter
The financial risk of non-compliance is severe enough that even a single violation can dwarf the annual cost of any compliance system.
Civil penalties under the AIM Act reach $124,426 per day per violation for civil judicial enforcement under EPA’s current penalty schedule (40 CFR 19.4, effective January 2025). Administrative penalties reach $59,114 per day with a cap of $472,901 per proceeding. Each kilogram of illegally distributed refrigerant constitutes a separate violation, meaning a single incident can generate multiple simultaneous penalties.
Criminal penalties include fines and up to 5 years imprisonment for knowing violations.
The EPA’s whistleblower program offers rewards of up to $10,000 for information leading to successful enforcement. This means disgruntled employees, competitors, and even customer facility staff can — and do — report suspected violations.
Recent enforcement actions demonstrate that EPA actively pursues refrigerant violations. Penalties in recent cases have ranged from hundreds of thousands to nearly half a million dollars for record-keeping failures, improper venting, and failure to repair leaking systems within required timeframes.
For a detailed breakdown of actual enforcement cases and fine amounts, see our article on EPA refrigerant fines in 2026.
State regulations that go beyond federal requirements
Federal AIM Act compliance is the baseline — but at least 12 states have enacted HFC regulations that exceed federal requirements. If you operate in multiple states or service customers across state lines, you may face additional obligations.
California has been the most aggressive, implementing GWP limits for new equipment in specific sectors (retail food refrigeration, commercial AC) that took effect before federal rules. California’s CARB regulations also include refrigerant sales reporting requirements.
New York, New Jersey, Washington, Colorado, Maryland, Connecticut, Delaware, Hawaii, Massachusetts, Oregon, Rhode Island, and Vermont have all adopted or proposed additional HFC restrictions through various legislative and regulatory mechanisms, many modeled on California’s approach.
The practical implication is that a contractor servicing equipment across multiple states may need to track compliance against both federal Subpart C requirements and varying state-level regulations simultaneously.
How to get compliant: the practical steps
Knowing the rules is the first half. Implementing compliance processes in your day-to-day operations is where most contractors struggle. Here is the practical sequence.
Audit your customer equipment inventory. Identify every system you service that contains 15 pounds or more of an HFC refrigerant with GWP above 53. Record the refrigerant type, full charge weight, system type (comfort cooling, commercial refrigeration, or industrial process), and installation date. This inventory is the foundation of everything else.
Establish a tracking system for every refrigerant addition. Every time a technician adds refrigerant to a regulated system, the date, amount, technician name, and calculated leak rate must be documented. Paper logs and spreadsheets technically work — but they create significant audit risk because they’re prone to gaps, calculation errors, and lost records. Digital tracking systems that auto-calculate leak rates eliminate these risks.
Train your technicians on the new thresholds. Many experienced techs know the old Section 608 thresholds by heart (10%/35%/35%). The AIM Act kept the 10% comfort cooling threshold but dropped commercial refrigeration to 20% and industrial to 30%. Combined with the lower 15-pound applicability rule, this means more systems trigger repairs at lower leak rates. Incorrect leak rate calculations or missed documentation on a 20-pound rooftop unit — a system that previously required no tracking — is now a potential violation.
Set up alerts for repair deadlines. When a system exceeds its leak rate threshold, the 30-day repair clock starts. Losing track of that deadline turns a manageable situation into a violation. Automated alerting systems ensure no deadline is missed.
Prepare for March reporting. If any customer system leaks 125% or more of its full charge during 2026, you must report it to the EPA by March 1, 2027. You need systems in place now to identify these chronic leakers before the reporting deadline arrives.
Check ALD requirements for large systems. If you service any commercial or industrial refrigeration systems with charges of 1,500 pounds or more, verify that automatic leak detection systems are installed (or scheduled for installation by the applicable deadline). Track ALD calibration dates — annual calibration is required.
Stop tracking compliance on spreadsheets
The 15-pound threshold fundamentally changed the math for manual compliance tracking. Under the old 50-pound rule, a typical contractor might have had 30–50 systems requiring federal tracking. Under the new 15-pound rule, that same contractor might have 200–500 systems requiring documented leak rate calculations for every refrigerant addition.
RefriComply was built specifically for this moment. Technicians log refrigerant additions from the field in 30 seconds — scan a QR code, enter the amount, submit. The system automatically calculates leak rates, triggers alerts when thresholds are exceeded, tracks repair deadlines, and generates audit-ready PDF reports for EPA inspectors.
Plans start at $29/month for solo operators, $59/month for teams up to 5, and $99/month for businesses with up to 15 users. That is a fraction of a single day’s potential fine.