The Mid-Year Subpart C Audit: Six Checks to Run on Your File Cabinet Before July 1

Week 24. Twenty-three weeks of Subpart C records on your books. Twenty-two of those weeks documented in real time, one of those weeks (somewhere — every shop has one) reconstructed from memory after busy season started swallowing the calendar.

July 1 is twenty-three days out. Independence Day weekend is the operational close of the first half of the year, and the first half of the year is the half that determines what your March 1, 2027 chronic-leaker reports will look like. Five months of leak rate calculations, 30-day repair clocks, verification tests, and refrigerant additions are now permanent record. The question is whether those records would survive an EPA inspector's cross-examination — and whether the running totals they feed are heading toward a clean March or a messy one.

This is the audit before the door closes.

Saturday's post covered the truck side of the business — what's on the back of the van before the next 95° Saturday. This is the file cabinet side. Six checks. Run them this week.

Before the checks, one foundational point that's worth restating because the May 21 federal rule changes muddied it for a lot of contractors:

The six checks, in order of operational priority:

Check 1 — Calendar-Year Cumulative Totals on Every Covered Appliance

This is the single most important number on your books at the half-year mark, because it's the number that determines the March 1, 2027 chronic-leaker report one appliance at a time. Pull every covered appliance (15+ lb HFC charge, GWP > 53) that you've serviced since January 1. For each one, calculate one number:

Total pounds of refrigerant added between January 1, 2026 and today, divided by full charge, expressed as a percentage.

Sort the list high to low. The May 18 post laid out the four-bucket triage for what to do with each bucket. At the half-year mark, the operational interpretation is:

The audit question: Does this number exist for every covered appliance, or only for the ones you remembered to track? The chronic-leaker calculation is unforgiving in this regard. A system that received refrigerant in March from one tech and refrigerant in April from a different tech, with neither addition cross-referenced to the same per-appliance ledger, is a system whose calendar-year total nobody actually knows. That's an audit failure even if the underlying calculations are right.

Check 2 — Open 30-Day Repair Clocks

Every threshold exceedance since January 1 started a 30-day repair clock under § 84.106(d). At the half-year mark, every one of those clocks should be in one of three states:

1. Closed cleanly — repair completed within 30 days, initial verification test passed within the 30-day window, follow-up verification test passed within 10 days of the initial test, ongoing inspection scheduled per the equipment category.
2. Closed via documented extension — repair extended for one of the regulation-permitted reasons (parts unavailable, regulatory conflict, industrial process shutdown), with the extension request in writing and on file.
3. Closed via documented § 84.106(j) plan — system couldn't be brought below threshold, retrofit/retirement plan signed by an authorized official within 30 days of the original exceedance, completion scheduled within one year.

Walk every threshold exceedance from January through May. Every one. For each, find the documentation that puts it in one of the three states above. If you can't find it, the clock is blown — and a blown clock with no documented extension and no § 84.106(j) plan is the single most common citation hazard small contractors face under Subpart C.

Check 3 — Verification Test Documentation on Every Closed Repair

This is the audit area most likely to catch a shop that does competent work but loose paperwork. Every leak repair triggered by a threshold exceedance requires two verification tests: an initial verification test within the 30-day window, and a follow-up verification test within 10 days of the initial test. Both must be documented with date, method, and result.

Pull every repair work order from January through May. For each, verify the file contains:

• Initial verification test record — date performed, test method (standing pressure / electronic detection at repair site / nitrogen pressure decay / other), pass/fail result with the specific reading.
• Follow-up verification test record — same fields, performed after the system returned to normal operating conditions, within 10 days of the initial test.

The audit failure pattern here is consistent: the initial test got performed and documented because the tech was still on site doing the repair. The follow-up test got performed two weeks later as part of the next routine visit, but the documentation lives on the routine-visit work order rather than being cross-linked to the original repair. From an inspector's perspective, that's an undocumented follow-up test. Cross-link it now or build the cross-link going forward.

For systems with full charges above 200 pounds, follow-up verification is explicitly mandatory under the regulation. For systems in the 15–200 lb range, the operational best practice is to treat verification testing as mandatory regardless of size — the documentation protects you in either direction and costs you nothing to maintain.

Check 4 — Calculation Method Consistency Per Appliance

This is the audit area that's invisible until somebody actually looks for it, and it's the one most likely to bite a shop that ran overflow help during busy season. The rule is straightforward: annualizing or rolling average, one method per appliance per calendar year. Switching methods mid-year on the same system is a documentation violation even when every individual calculation was performed correctly.

Pull a sample of 10–15 covered appliances at random. For each, look at every refrigerant addition since January 1 and confirm the same calculation method appears on every record. If any appliance shows annualizing on one ticket and rolling average on another in the same calendar year, that's a real audit gap — and it almost certainly happened because two different techs picked their default method in the field without checking the appliance's prior records.

The fix: the method is a property of the appliance, set in your records, not a choice the tech makes in the field. If your service tickets or app pre-populate the method per appliance based on the appliance record, this failure stops happening. If the tech picks in the field, it's only a matter of time before two of them pick differently. This is exactly the kind of documentation discipline the May 25 busy season post was pointing at.

Check 5 — § 84.106(j) Retrofit/Retirement Plans on File

Any system that couldn't be brought below the applicable leak rate threshold within 30 days, and where the decision was made to retrofit or retire rather than continue repair attempts, requires a written § 84.106(j) plan within 30 days of the original determination. The plan must:

• Identify the specific appliance (make, model, serial, location, full charge, refrigerant type)
• State the date the threshold was exceeded and the leak rate calculation that triggered it
• State the calculation method used
• Describe all leak locations identified and all repairs attempted
• State the reason repairs were not completed within 30 days (or the reason for choosing retrofit/retirement over continued repair)
• Schedule completion within one year of the plan date
• Be signed by an authorized company official — the building owner or their authorized representative
• Be available at the site of the appliance in paper or electronic form

Pull every appliance where the decision was made to retrofit or replace since January 1. For each, verify the § 84.106(j) plan exists, is dated, is signed by the right person, and is at the appliance site. If any are missing, draft them this week using the actual decision timeline from your service records. The plan is the building owner's compliance obligation under the regulation, but the document only exists if you produce it. Last Monday's repair-vs-retire post covered the framework; this is the documentation footprint that framework leaves behind.

Check 6 — Q3 Refrigerant Pricing and Inventory Posture

This is the audit area that's about operating posture rather than compliance documentation, but it pairs with the documentation work because it's the same set of records that informs both. The 2025 R-454B supply shortage is publicly declared over by HARDI. But the 2026 pricing environment is moving in a direction that affects how you handle Q3 service work.

The May 21 Technology Transitions Reconsideration extended the install window for pre-2025 R-410A residential and light commercial equipment, which keeps demand for R-410A refrigerant supplied through service work elevated through the rest of the decade — while the AIM Act phasedown continues cutting supply on the same schedule. HARDI has published an industry estimate of approximately $8 billion in additional refrigerant costs over the relief window, with broader supply-chain impact estimates reaching higher.

What that means operationally for July 1:

• Refrigerant pricing on R-410A is not going to soften between now and Q4. Plan inventory and customer-quote pricing accordingly.
• R-454B pricing is stable but not declining. A2L truck stock locked in at June rates is generally safer than waiting for Q3 cylinder pricing.
• June 2026 broad equipment and component price increases are baking in across the trade — Trane up to 5% in January, Lennox up to 10% in February, plus a wave of mid-June increases on pumps, controls, valves, and motors. The replacement quotes in your retire-or-retrofit conversations need to reflect current numbers, not Q1 numbers.

The audit question on this one: does your shop have a refrigerant inventory plan, a customer-quote pricing posture, and a Q3 truck-stock budget that reflect the current pricing environment, or are you still operating on Q1 assumptions? If it's the latter, fix it before July 1 — refrigerant pass-through in service agreements only works if the price you're passing through is the price you actually paid.

What the Audit Output Should Look Like

Run the six checks. The output isn't a passing grade or a failing grade. It's a working document with three columns for every covered appliance:

Keep the working document. Run the next mid-year review against it on June 7, 2027.

The audit before the door closes is a different exercise than the audit after the door closes. Run it now.

The Bridge to the Back Half

The first half of 2026 is the half that gets reported. The second half of 2026 is the half that gets watched — running totals climbing toward 125%, repair clocks running through the hottest service months, verification tests piling up as the busy season volume compounds.

If you ran the Q1 self-audit in March and walked the four-bucket mid-year triage in May, this is the audit that closes the loop on H1 2026. From here, the operational posture pivots: every weekly check from now through December is a forward-looking check against the running totals you just locked in. Every refrigerant addition between now and December 31 lands on the books that the March 1, 2027 reports will read from.

Six checks. Twenty-three days. The audit is cheap. The gaps it finds are cheaper to fix this week than next March.

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Next post (Saturday June 13): the documentation difference between a service ticket that survives an inspection and one that doesn't. We'll walk a real example through the audit framework above and show what an inspector actually finds when they pull the file. See you Saturday.