The Records That Have to Survive Three Years (and What "Electronic Is Fine" Really Means)

Ask any contractor how long refrigerant records have to be kept and you'll get the right answer: three years. It's the one recordkeeping fact the whole trade has memorized, and it's genuinely correct — it's the first sentence of the recordkeeping paragraph in 40 CFR § 84.106.

Now ask the follow-ups an inspector would ask. Three years from when? Which records? All thirteen types, or just the service tickets? What about the record the regulation says to keep until three years after the appliance is retired — which, for a rooftop unit that runs fifteen years, is an eighteen-year file? And when the rule says electronic or paper is fine, what standard is your file cabinet actually being held to?

That's where the memorized answer runs out. This post is the full inventory: every record § 84.106(l) names, how long each one actually lives, and what the format allowance does — and doesn't — buy you.

The One Sentence Everyone Knows (and Its Four Words Everyone Skips)

Three things in that sentence do real work:

1. "At least three years" — three years is the floor, not the target. Nothing stops you from keeping records longer, and for some of them (we'll get there) you'll want to.
2. "Electronic or paper format" — the EPA doesn't care about the medium. It cares that the record exists, is complete, and can be produced. More on what that means in practice below.
3. "Unless otherwise specified" — the four skipped words. At least one record type carries a longer clock, and it happens to be the one everything else is built on.

The Record With the 18-Year Clock

Paragraph (l)(1) is the appliance file — the record that had to exist by January 1, 2026 (or at installation, for newer equipment) for every covered appliance with 15 or more pounds of refrigerant. It holds the owner/operator identification, the address where the appliance is located, the full charge and the method used to determine it, any revisions to the full charge with dates, and the installation date.

And its retention clause is the "otherwise specified" case: it must be maintained "until three years after the appliance is retired."

Think about what that means. A commercial rooftop unit installed in 2026 that runs until 2041 has an appliance file that must survive until 2044. Not the service tickets — those age out on the rolling three-year window. The appliance record: the full charge, how it was determined, and every revision along the way.

There's a logic to it. The full charge is the denominator in every leak rate calculation the appliance will ever have. A three-year-old service ticket is only auditable if the full charge it was calculated against is still on file. Let the appliance file lapse and every leak rate in the cabinet becomes an unverifiable number.

The Full Inventory: Thirteen Record Types

Here's everything § 84.106(l) actually names, grouped the way your filing should think about them.

The two files every covered appliance has

(l)(1) — The appliance file. Covered above. Owner/operator, address, full charge + determination method (including, if you used the established-range method, the range, its midpoint, and how it was determined), full-charge revisions with dates, installation date. Lives until three years after retirement.

(l)(2) — The event record. One record every time a covered appliance is installed, serviced, repaired, or disposed of: the appliance's identity and location, the date, the parts worked on, the type of work per part, the name of the person who did it, the amount and type of refrigerant added (or removed, for disposal), the full charge, and the leak rate with the method used to determine it. This is the service ticket we tore down field by field — and it's the record most shops are silently underbuilding.

The exceedance trail

If an appliance ever trips its leak-rate threshold, four more record types come alive:

• (l)(5) — Leak inspection records: the date, the method(s) used, the location of each leak found, and a certification that all visible and accessible parts were inspected. The technician who does the inspection must hand the owner documentation meeting these requirements when the service concludes.
• (l)(7) — Verification test records: dates and results of every initial and follow-up test, the appliance location, the location of each repaired leak that was tested, and the test types used. Again, the technician must provide this documentation to the owner.
• (l)(8) and (l)(9) — Retrofit/retirement plans and extension requests: if repairs fail and a plan is created under § 84.106(h), the plan itself is a required record — as is any extension request submitted to EPA.

The flexibility records

Every escape hatch in Subpart C has a paper trail attached. Use the flexibility, keep the record:

• (l)(10) — Mothballing: when the appliance was mothballed and when refrigerant was next added. This is what proves your repair clock was legitimately suspended.
• (l)(11) — Purged-and-destroyed refrigerant: if you exclude purged refrigerant sent for destruction from leak-rate math, the monitoring records that support the claim (flow rate, quantity or concentration, purge periods, the control device and its destruction efficiency).
• (l)(12) — Seasonal variance: a record that you're using the variance, plus the amounts added and removed.
• (l)(3) — Method-change records: if you switch leak-rate calculation methods after acquiring a facility (the one narrow case where switching is allowed), the record of both methods' results and the dates.

The paper about the paper

(l)(13) — Copies of everything you send EPA, and everything EPA sends back. Extension requests, retrofit/retirement filings, chronic-leaker reports — if it went to the agency, a copy stays in your file, along with any EPA response.

The handoff duty

(l)(4) is the one that puts a duty on the servicing contractor rather than the owner: whoever performs the installation, service, repair, or disposal — if it isn't the owner — must provide the owner with a record containing the (l)(2) information. If you're an outside contractor, most of this paragraph is your customer's obligation, but this line is yours. The record you hand over at the end of the call is a federal requirement, not a courtesy.

What "Electronic Is Fine" Actually Means

The format allowance is real: a shop that keeps everything on paper is exactly as compliant as one running dedicated software — if the records are complete. The regulation sets no standard for the medium. But notice what that shifts the burden onto. The standard isn't "do you have a system." It's:

Can you produce the record? Retention that can't survive retrieval isn't retention. An inspector asking for one appliance's history doesn't want your cabinet — they want that appliance's file: its full charge and method, its additions, its leak rates, its verification tests, in order. The audit-defense walkthrough covers what that production moment actually looks like; the short version is that per-appliance organization is the whole game, whatever the medium.

Is every required field present? "Electronic" doesn't grade on a curve. A spreadsheet missing the determination method for full charge fails the same way a paper ticket missing it fails. The thirteen types above each have named fields; the format allowance never waives one of them.

Does the record hold up as a record? Here's where the mediums genuinely differ. Paper and editable spreadsheets can't prove what they looked like last year. Records that are append-only — where a correction is a new entry rather than an overwrite — carry their own credibility into an inspection. The regulation doesn't require that. Inspections reward it.

One more distinction worth pinning, because contractors conflate them constantly: records may be paper; reports may not. The very next paragraph, § 84.106(m), requires that all notifications to EPA — repair-deadline extensions, retrofit/retirement filings, chronic-leaker reports — be submitted electronically through the agency's reporting platform. The file cabinet can be manila folders. The filing cannot.

This Isn't New — It's Newly Enforceable at 15 Pounds

If the three-year figure feels familiar, it should: the Section 608 world has run on the same convention for decades — 40 CFR § 82.166(m) sets the identical three-year minimum on the Part 82 side, which still governs CFC and HCFC appliances like your remaining R-22 fleet. What changed on January 1, 2026 is reach: Subpart C pulled every HFC appliance down to the 15-pound threshold and made the record list longer and more specific. If you're still sorting out which of the two rules covers which system, the split matters here too — but the retention discipline is the same on both sides.

The Friday Test

Pick one covered appliance you serviced this spring. Without warning anyone, try to assemble its complete file: the (l)(1) appliance record with full charge and method, every (l)(2) event record for the past three years, and — if it ever tripped a threshold — the inspection, verification, and plan records behind the repair.

If that takes fifteen minutes, your retention is real. If it takes a weekend, you have storage, not records. The difference is invisible right up until someone with a federal credential asks — and by then it's the only thing that matters.