HVAC contractors run on refrigerant, copper line sets, steel ductwork, and equipment that just went through a mandatory product transition. Your supplier's pricing system updated for every one of those changes. The Overcharge Ledger makes sure your invoices did too.
IBISWorld estimates $159.4 billion in U.S. HVAC contractor industry revenue in 2026, with 120,000 businesses operating nationwide and a 2.6% CAGR over the past five years. HVAC contractors run a steady business anchored by essential repair and maintenance demand — but the materials side of that business just went through the largest regulatory transition in a generation.
R-410A — the dominant residential refrigerant for over two decades — was phased out of new equipment production at the end of 2024 and is now illegal to install as a complete system in 2026. That transition created a window of pricing chaos that your supplier's billing system navigated with perfect information. Yours may not have.
New installation, replacement, and service of residential heating and cooling systems. High equipment and refrigerant volume. Multiple supplier relationships across equipment manufacturers, refrigerant distributors, and parts suppliers.
Rooftop units, chillers, variable refrigerant flow systems, and complex commercial building controls. Larger equipment orders, longer lead times, and material deliveries that span months — giving supplier pricing more opportunity to drift.
Precision cooling for data centers, manufacturing, and pharmaceutical facilities. Highly specified equipment and refrigerant grades. A specification substitution on refrigerant type or equipment model is a compliance issue as much as a cost issue.
Ongoing maintenance contracts and emergency repair. Refrigerant charges, filters, belts, capacitors, and controls billed per service call — high frequency, low per-item visibility. The Ledger catches what individual service orders miss across your full account history.
The AIM Act phasedown of HFC refrigerants created a mandatory equipment and refrigerant transition that every HVAC supplier navigated — and priced — on their own timeline. R-410A equipment production stopped at end of 2024. Installation of complete R-410A systems is now prohibited in 2026. The transition to R-454B and R-32 systems created genuine supply constraints — and significant pricing opportunities for suppliers who moved faster than their customers.
What your supplier invoiced you during this transition — for refrigerant, for equipment, for line sets, for replacement parts — is exactly what the Ledger reads. The data shows whether what you paid tracked the actual market, or whether the transition was used to expand supplier margin on top of genuine cost increases.
If your HVAC supplier invoices cover the 2022–2026 transition period, the Ledger maps every refrigerant charge, every equipment line item, and every price movement against what was quoted. Genuine cost increases look different from margin expansion. The data makes that visible. We record it. We measure it. We verify it.
R-410A quoted at one price. R-454B delivered — a different refrigerant, different equipment compatibility, different cost basis. Invoice shows the higher-priced refrigerant billed against a quote that specified the old standard.
Unit quoted at one SEER rating and model number. Delivery comes with a different efficiency rating or model — billed at the quoted price without disclosing the substitution or the cost difference to your supplier.
Supply chain surcharge added during the R-410A shortage. Equipment supply normalizes. Surcharge remains on every subsequent invoice as a permanent line item — now detached from any actual supply constraint.
Refrigerant charged per pound on service calls. Quantity billed exceeds system charge requirements. Volume of service calls makes this pattern invisible without full invoice history comparison — exactly what the Ledger holds simultaneously.
HVAC equipment is built on copper coils, aluminum heat exchangers, steel compressor housings, and ductwork. All commodity-backed. All moving. And layered on top of that — a refrigerant transition that created genuine supply disruption and genuine pricing volatility that your supplier passed through your invoices.
The BLS PPI for HVAC and Commercial Refrigeration Equipment (PCU33343334) reached 232.339 in December 2025 — a near all-time high for this index. Copper, which lines every coil and line set you install, hit record highs twice in 2025.
The Ledger is building commodity index tracking into every client dashboard. When equipment PPI moves or copper shifts, you see whether your supplier's invoices track the market or expand beyond it. We record the data. We measure it. We verify it. We do not provide financial advice.
Between the refrigerant transition and commodity movement, your HVAC supplier had more pricing justification available in 2023–2026 than at any point in the previous decade. The Ledger documents what was a legitimate cost pass-through versus what was margin expansion riding the same story. That distinction belongs in your proof package.
Every pattern below has appeared in active HVAC contractor engagements. The refrigerant transition created new versions of patterns that have always existed — and gave suppliers new language to justify them.
One refrigerant quoted. A different refrigerant delivered and billed. Different molecular composition, different equipment compatibility, different price point — identical description on the invoice.
Unit quoted at a specific model and SEER rating. A different efficiency class or model delivered. Same tonnage description on the invoice — different cost basis for your supplier, different price for you.
Refrigerant billed per pound on service calls. System charge requirements are fixed by equipment specification. Overages are billed against a volume no single service order would flag — but the Ledger holds your full service history simultaneously.
Supply chain surcharge added during the R-410A shortage. Equipment availability normalizes. Surcharge persists. It has become a permanent margin line detached from the supply condition that originally justified it.
Line sets are quoted per linear foot at job start. By the time the installation crew orders the run, the per-foot price has moved — no change order, no notice. Multiplied across every unit installed on a multi-unit job.
Capacitors, contactors, thermostats, and control boards billed per service call with no agreed price. Your supplier sets the number at invoice time. Across a maintenance contract with multiple service calls, unquoted parts spend compounds significantly.
The Ledger produces a complete proof package for your HVAC supplier relationships. Every discrepancy documented back to its source — refrigerant invoice, equipment order, service call record. Quote. Invoice. Line item. Dollar amount.
The transition gave your supplier more pricing justification than they've had in decades. The Ledger documents what was real versus what wasn't.
Every overcharge sourced and documented. Hand it to your HVAC equipment supplier or your attorney — every number comes from their own invoices and your own quotes.
Every instance where what was delivered and billed differed from what was quoted — by refrigerant type, by model number, by SEER rating. Documented and priced.
Every part, every control, every refrigerant charge billed without an agreed price — exported as a spreadsheet. Send it directly to your supplier. They now have to respond with formal pricing.
Your invoice price history mapped against BLS PPI for HVAC equipment and copper. See exactly where your supplier's price increases track the market — and where they don't.
Full methodology documentation structured for your attorney if the engagement requires legal proceedings — how every match was made, how every discrepancy was flagged.
Monthly service. Flat rate. Cancel anytime. No contract required to start.