EPA Section 608 + AIM Act Part 84: What HVAC Contractors Need to Track Starting in 2026

If you've been running an HVAC shop for a while, "EPA Section 608" probably feels familiar — refrigerant leaks, certified technicians, recordkeeping. You learned it once, you live with it.

What's new is that there's now a second federal framework sitting on top of it: the AIM Act, implemented under 40 CFR Part 84. As of January 1, 2026, both rules can apply to the same job at the same time. The Part 84 obligations are stricter on key points (lower charge thresholds, more substitute refrigerants in scope), and the EPA has been clear that Part 84 does not displace Part 82 — they layer.

This post walks through what each rule covers, what changed in 2026, what you actually need to capture in the field per service event, and how to stay audit-ready without burying your techs in paperwork. If you'd rather skip the background and see how a software platform handles all of this directly, jump to how TuffOps Comply makes you audit-ready in 30 days.

The two frameworks, in plain English

Section 608 (40 CFR Part 82, Subpart F) — the "old" rule you already know

Section 608 of the Clean Air Act is the foundational refrigerant rule. It's been around for decades and covers:

• Technician certification. Anyone who could release refrigerant must be certified under §82.161 (Type I, II, III, or Universal).
• Service practices. Recovery before opening a system, evacuation requirements, leak inspection, etc.
• Leak repair. For appliances with a full charge of 50 lb or more, leaks above the threshold rate must be repaired within set timeframes.
• Recordkeeping. Service records, refrigerant added/recovered, leak rate calculations, and repair verification — typically retained for at least 3 years.

If your shop has been doing residential and light commercial work primarily, Part 82 has historically applied to a relatively small slice of your equipment — the bigger commercial systems above 50 lb of charge.

AIM Act / Part 84 (40 CFR Part 84, Subpart C) — the "new" rule effective 2026-01-01

The American Innovation and Manufacturing Act (AIM Act) authorized the EPA to phase down high-GWP HFCs and govern their servicing, repair, disposal, and installation. Part 84 Subpart C is the operational rulebook for HVAC contractors. Three things matter most for day-to-day operations:

1. Lower charge threshold (15 lb instead of 50 lb)

Where Part 82's leak-repair regime kicked in at 50 lb of refrigerant charge, Part 84 lowers that to 15 lb for many appliance categories. That's a huge expansion of scope. Equipment that was effectively unregulated under Part 82 — small commercial refrigeration cases, light industrial process units, mid-sized comfort cooling — now falls under leak-repair obligations once it hits 15 lb of charge.

2. GWP > 53 captures most modern HFC blends

Part 84 covers refrigerants that are either (a) regulated substances under the AIM Act or (b) substitutes with a Global Warming Potential greater than 53. That second condition matters because it sweeps in nearly every common HFC blend you're servicing today: R-410A, R-404A, R-407C, R-134a, R-32, and most of their replacements.

If you serviced it with a non-CO₂, non-ammonia, non-hydrocarbon refrigerant, assume Part 84 applies until you've confirmed otherwise.

3. Two important carve-outs

Not every appliance is in scope. Two carve-outs to know:

• RLCA (Residential and Light Commercial AC/HP). Equipment in the residential and light commercial air conditioning and heat pump subsector is carved out of Part 84's leak-repair obligations. This is the carve-out that keeps most residential service calls outside the new rules. Important: the carve-out is per-unit and depends on subsector classification — it's not a blanket "residential is exempt" rule. Document the determination on each unit.
• ODS-only appliances. Equipment containing solely listed ozone-depleting substances (like R-22) as refrigerant is exempted from Part 84 specifically (Part 82 still applies — that's what governs R-22 service). This matters because R-22 equipment is being phased out of service, not into Part 84.

Both rules can apply to the same job

This is the part most contractors get wrong. Part 84 does not replace Part 82. Where both frameworks govern the same operator-facing rule, your audit records need to show compliance with both — typically with both CFR citations attached to the same event.

A practical example: a 25 lb commercial refrigeration unit with R-404A serviced for a leak in March 2026.

• Section 608 / Part 82: Doesn't apply — under the 50 lb threshold.
• AIM Act / Part 84: Applies — over 15 lb, GWP > 53, not in the RLCA carve-out, not ODS-only.

Conversely, an 80 lb chiller with R-22:

• Section 608 / Part 82: Applies — over 50 lb, ODS refrigerant.
• AIM Act / Part 84: Does not apply — ODS-only carve-out.

And an 80 lb chiller with R-410A:

• Both apply. Your records need to satisfy both.

What you actually need to track per service event

Strip away the legal language and the field-level requirements come down to a fairly consistent list. For every refrigerant-related service event on an in-scope unit, your records should capture:

• Unit identification. The specific appliance — make, model, serial, location, full charge in pounds, refrigerant type, and GWP.
• Technician. Certified tech name, certification number, and certification type (§82.161 Type I/II/III/Universal).
• Service date and arrival time. When work began and ended.
• Reason for service. Leak inspection, leak repair, charge addition, recovery, retrofit, decommission, etc.
• Refrigerant added. Amount in pounds, source (virgin/reclaimed), refrigerant type.
• Refrigerant recovered. Amount in pounds, destination (recovery cylinder ID, reclaim, destruction).
• Leak rate calculation when applicable, with the underlying inputs.
• Leak repair details. Component repaired, repair method, verification test results, repair deadline tracking.
• Verification of repair. Initial and follow-up verification per the applicable regulation.
• CFR citation for the rule being satisfied — Part 82, Part 84, or both.

Recordkeeping: how long to keep what

Different sections have different retention periods, but a safe operating posture is:

• Service records: Minimum 3 years. Many shops keep them for the life of the equipment plus 3 years.
• Leak rate calculations and repair verifications: 3 years minimum, often longer when chained to ongoing inspection cadences.
• Technician certifications: Indefinitely — your techs need to prove certification on demand.
• Refrigerant purchase, sales, and transfer records: 3 years.

The single biggest mistake we see contractors make: treating "we have it in a filing cabinet somewhere" as compliance. When the auditor asks, you have hours, not days, to produce the relevant records for a specific unit and date.

Want to see how TuffOps handles refrigerant compliance automatically? Book a 30-minute demo and we'll show how the Comply module builds Part 82 / Part 84 records directly from work orders.

A practical workflow your techs can actually follow

Compliance fails at the field level when techs have to remember the rules. The workflow that scales is:

1. Start with the unit. Tech scans the unit (QR code or lookup) and the system already knows refrigerant type, GWP, full charge, RLCA classification, and which rules apply.
2. Pick the service reason. "Charge addition," "leak repair," "recovery," etc. The system prompts only for fields the chosen reason actually requires.
3. Capture refrigerant amounts. Added, recovered, source, destination — entered once, on the phone, in real time.
4. Auto-calculate the leak rate. If the event triggers a leak rate calculation, the system runs it from the unit's rolling 12-month history rather than asking the tech to do math.
5. Stamp the CFR citation. Every record carries the applicable rule (82, 84, or both) so audits map cleanly to the regulation.
6. Drive deadlines forward. Leak-repair deadlines and follow-up verifications appear on dispatch automatically — no calendar reminders to set, no spreadsheet to maintain.

That's the model TuffOps Comply is built around. The tech just does the job. The compliance record builds itself.

Quick-reference: Part 82 vs. Part 84

Aspect	Section 608 / Part 82	AIM Act / Part 84
Effective	Existing	January 1, 2026
Charge threshold for leak repair	≥ 50 lb	≥ 15 lb (many categories)
Refrigerants covered	Class I and II ODS	Regulated substances + substitutes with GWP > 53
RLCA carve-out	Generally no	Yes — residential / light commercial AC/HP exempt from leak-repair
ODS-only appliances	Covered	Carved out
Technician certification	§82.161 (Type I/II/III/Universal)	References §82.161 — same certs
Recordkeeping minimum	3 years (typical)	3 years (typical)
Can both apply to one unit?	Yes — Part 84 does not displace Part 82

What this means for your shop in 2026

Three honest observations for HVAC contractors right now:

1. Your in-scope equipment count just expanded. If you only ever tracked 50 lb+ commercial systems under Part 82, you now have a much larger pool of mid-size equipment that needs Part 84 leak-repair coverage. Audit your customer base and tag each unit's regulatory status.
2. Spreadsheets won't scale. Tracking refrigerant events across two regulatory frameworks per unit, with leak rate calculations, deadline clocks, and CFR citations, is past the point where a spreadsheet works. This is exactly the work that has to live in software.
3. Per-event capture is the only way. If your techs come back at the end of the day and write up what happened from memory, you will get this wrong. The tools have to capture it on-site, in real time, with the unit context already loaded.

The good news: once your operation captures refrigerant events as part of the normal work order flow — same screen, same tech, same workflow as any other job — Part 82 and Part 84 stop being scary. They become a side effect of doing the job properly.

Where to verify the rules yourself

• 40 CFR Part 82 (Section 608): eCFR Part 82
• 40 CFR Part 84 (AIM Act): eCFR Part 84
• EPA's AIM Act page: epa.gov/climate-hfcs-reduction

Don't take this post (or any vendor's blog) as a substitute for reading the regulations or talking to your environmental counsel. The rules evolve and the edge cases are real.

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