HVAC Warranty What Is Covered and What Is Not

HVAC Warranty: What Is Covered and What Is Not — A Contractor's Field Guide

The manufacturer's warranty is never as simple as "10 years, parts and labor." In practice, a registered split system carries 10-year parts coverage but only a 1-year labor warranty, and the homeowner is still on the hook for refrigerant, nitrogen, filters, and the service call — typically $400 to $800 for a "covered" repair. Roughly 75% of air conditioning failures trace back to improper installation or documented maintenance gaps, and 20–30% of first-time warranty claims are denied due to missing serial numbers, AHRI mismatches, or unregistered units. The bottom line: the warranty is a shared risk contract, and the contractor who understands registration deadlines, Magnuson-Moss protections, and manufacturer-specific heat exchanger and compressor policies is the one who gets paid — and keeps the customer.

This guide is written for the technician, service manager, and owner. If you're an HVAC Maintenance Pros reader, you already know the homeowner-facing version of this story. This is the version that keeps you profitable when a warranty claim hits your truck.

The Parts vs. Labor Split: Set Expectations Before You Write the Invoice

The single most misunderstood element of an HVAC warranty is the split between parts and labor. Every major manufacturer — Trane, Carrier, Lennox, Rheem, Goodman — covers failed components under a parts warranty. None of them cover the labor to install those parts beyond the installing contractor's standard 1-year labor warranty.

When a compressor fails in year four and the parts warranty covers it, the homeowner is still paying for the technician's time to recover refrigerant, pull the charge, braze in the new compressor, evacuate the line set, and recharge the system. At a labor rate of $100–$150 per hour, that's a meaningful invoice line even when the compressor itself is free.

Set the expectation at the diagnostic call. Hand the homeowner a line-item breakdown: compressor covered at $0, labor at $1,200, refrigerant at $40–$60 per pound for R-410A, nitrogen at $25, filter-drier at $15. When the homeowner understands the split upfront, the invoice is not a surprise — and you keep the service relationship instead of losing it to a "free warranty" competitor.

The 90-Day Registration Trap: The Costliest Mistake You Can Make

Here is the statistic that should change how you run every install: most major manufacturers require the product to be registered within 90 days of installation. Unregistered units automatically drop from 10-year parts coverage to 5-year parts coverage. For Goodman, the same rule applies — and the unregistered penalty is even steeper because Goodman's lifetime compressor warranty on registered single-family residential units shrinks to a 5-year compressor warranty when registration is missed.

The contractor is the weakest link in this chain. Industry estimates suggest that a majority of voided or downgraded warranties are caused by the installing contractor's failure to register the unit, not by homeowner neglect. When the condenser fan motor fails in year six and the manufacturer's system flags "not registered," the technician on the truck has to explain to an angry homeowner that the "$150 missed registration" just cost them $1,400 in covered parts.

Fix this with process, not memory. Make registration part of the install checklist — before the crew leaves the job site, photograph the serial number, complete the online registration form on the manufacturer's dealer portal, and email the confirmation to the homeowner. A 10-minute step that protects a $10,000 system investment is also your best upsell for a maintenance agreement, because the homeowner now knows you're the one who protected their warranty.

What Actually Voids a Warranty — and What the Manufacturer Must Still Honor

Manufacturers love to claim that a warranty is void. The legal reality is narrower than most homeowners — and some contractors — believe. Under the Magnuson-Moss Warranty Act, a manufacturer cannot void an entire warranty simply because a non-branded part was used or an unauthorized service provider performed maintenance. The warranty can only be denied if the manufacturer can prove the non-approved part or service caused the failure in question.

That shifts the leverage back to you on the job site. If a homeowner had a coil cleaned by a handyman who didn't touch the electrical system, and the capacitor fails, the manufacturer cannot legally deny the capacitor claim because an unlicensed person cleaned the coil. The failure wasn't caused by the coil cleaning. Know this statute cold, because it's the difference between getting paid on a legitimate claim and eating the cost of a part the manufacturer should cover.

That said, there are legitimate void conditions. The big three are improper installation, lack of documented maintenance, and non-matching (non-AHRI-rated) system configurations. A compressor that fails because the technician installed the wrong piston size or failed to evacuate the line set is a voided warranty — and that claim gets charged back to the installing contractor. The manufacturer's warranty documentation is explicit that the system must be installed to code, charged to factory specifications, and maintained to a reasonable standard.

Where the "Lack of Maintenance" Argument Holds Water

The most common warranty denial you'll fight is the "lack of maintenance" exclusion. Industry data from the Florida Solar Energy Center and related studies attribute roughly 75% of system failures to improper installation or poor maintenance. Around 40% of failures involve dirty coils or restricted airflow — conditions a manufacturer can reasonably classify as owner neglect.

Here is the field reality: manufacturers rarely send an inspector to verify a dirty filter. In most cases, the warranty administrator denies the claim based on the absence of documented maintenance records. If you have not logged filter changes, coil cleanings, and charge checks, the homeowner has no evidence — and neither do you.

That is why every maintenance visit needs a written record with photos. Note the date, the filter MERV rating, the measured superheat and subcooling, the coil condition, and the ambient temperature. Photograph the coil before and after cleaning. Email the report to the homeowner. When the warranty claim comes in — and it will — your documentation is the difference between a covered claim and a $2,500 dead compressor.

Manufacturer Warranty Comparison: The Numbers You Need on the Truck

Manufacturer policies vary in ways that directly affect your repair quotes and your customer conversations. Here is the side-by-side comparison for the five major brands you're most likely to encounter in the field, current for 2026 residential systems.

*Goodman's lifetime compressor warranty applies to registered units in single-family residential applications. Commercial and multi-family installations drop to 10 years or less.

Note the heat exchanger column. Lennox and Carrier extend heat exchanger coverage to 20 years on select premium models, and Rheem and Goodman offer limited-lifetime heat exchangers on certain furnaces. In a year eleven heat exchanger failure on a 20-year-coverage Lennox model, the homeowner gets a free heat exchanger but still pays for labor, the gas line disconnect, flue rework, and the service call — which is exactly the conversation you need to have before the repair, not after the invoice lands.

Warranty Work Is a Low-Margin Trap — Know Your Costs Before You Say Yes

Here is the uncomfortable truth about manufacturer warranty claims: they pay the contractor wholesale pricing on parts, often 10–30% below your standard cost, and the labor reimbursement is a fraction of your retail rate. The manufacturer's warranty administrator sets the labor allowance by a flat-rate book, not by your actual hours. A compressor swap that realistically takes eight hours might reimburse at four.

That changes the decision calculus on every failed compressor. Before you agree to process a warranty claim, run the numbers. If the manufacturer reimburses parts at cost minus 20% and labor at $75 per hour against your actual cost of $140 per hour, you are subsidizing the repair. In that case, it is often more profitable to quote the job as time-and-materials to the homeowner, file the warranty claim yourself, and let the owner be the one who gets the check — or simply decline the warranty path and quote a straight cash repair.

You are not obligated to process a manufacturer warranty claim. The warranty contract is between the manufacturer and the homeowner; the installer is not legally bound to perform the repair at the manufacturer's labor rate. If the warranty labor allowance is below your break-even, tell the homeowner up front: "The comp is covered by the warranty, but the manufacturer's labor allowance is $300 below my cost. I can do the repair for my standard labor rate plus the covered part." Many homeowners will pay the difference gladly because they're still saving $1,200 on the compressor.

Extended vs. Aftermarket Warranties: Where the Margin Lives

Manufacturer extended labor warranties are a different animal from parts warranties. An extended labor plan runs $300–$800 for 5–10 years of additional labor coverage, depending on the brand and the equipment tier. The margin on these plans is solid, the claim process is straightforward, and the coverage is easy to explain: the same 1-year labor protection, just stretched out.

Third-party aftermarket contracts — the HomePro and American Home Shield type plans — are where the profit margins get complicated. These administrators routinely deny claims for pre-existing conditions, improper installation, and lack of maintenance, and their approval process for a compressor replacement can take days. When they do approve, they pay on a depreciated schedule that rarely covers your retail rate.

Handle aftermarket warranty calls with a specific protocol: verify coverage before dispatching, document everything with photos, and get a reference number before any diagnostic work. If the administrator denies the claim, you have the diagnostic documentation to convert the homeowner to a cash repair on the spot. The service call is already scheduled; the technician is already on site. The difference between a $200 loss and a $2,800 sale is whether you collected the documentation.

When "Covered" Still Costs the Homeowner $800

Every technician has heard the angry phone call: "You said my AC was under warranty, and now you're telling me I owe $600." You said the compressor was covered — and it was. But the homeowner heard "free."

Run this scenario with a condenser fan motor failure. The motor is covered under the 10-year parts warranty. The homeowner's cost breaks down like this: $120 diagnostic fee, $75 for the service call, $180 in labor to replace the motor, $85 for the capacitor that the manufacturer ships with the motor kit, $65 for refrigerant because the technician had to pump down the system, and $40 in miscellaneous shop supplies. Total: roughly $565 for a "covered" repair. With the extended labor warranty that the homeowner declined, it might have been $120.

Be the contractor who explains this before the repair, not after. Put a "Warranty Repair Cost Estimate" on the counter that lists exactly what the warranty covers and exactly what it doesn't. This transparency is a differentiator — most contractors hide behind the warranty and let the invoice do the talking. The contractor who walks the homeowner through the line items is the contractor who gets the maintenance agreement, the indoor air quality upgrade, and the referral.

Warranty Claim or Cash Repair? A Field Decision Framework

When you're staring at a failed compressor, run through this sequence before you make a single call to the manufacturer.

1. Pull the serial number and check registration. If the unit is unregistered and more than five years old, the parts warranty is expired. Quote cash immediately — do not waste a week of the homeowner's time on a denial letter.
2. Verify the AHRI match. If the condenser and coil are not a matched set, most manufacturers deny the claim. Check the AHRI directory on your phone before you call.
3. Review the maintenance history. If you have no documented maintenance records for the system, the "lack of maintenance" exclusion is a real risk. Be honest with the homeowner about the likelihood of denial before you file.
4. Run the margin math. Calculate your cost to perform the repair against the manufacturer's parts and labor reimbursement. If the claim pays below your break-even, present the option of processing the claim for the homeowner while quoting your standard retail labor rate.
5. Document everything. Photograph the failed component, the serial tag, the AHRI sticker, and the installation date. The manufacturer's claims department denies 20–30% of first-time claims for missing or incomplete documentation. Your photos are the difference between approval and a second round of back-and-forth.
6. When in doubt, call the manufacturer's technical support line with the homeowner on speakerphone. Let them hear the coverage terms directly. It saves you from being the messenger of bad news.

Transferability and the Home Seller Problem

Warranty transferability is a near-universal blind spot. Over 70% of homeowners do not know that most HVAC warranties are non-transferable or allow only one transfer for a fee of $100–$200 within the first five years. That matters to you because real estate transactions generate service calls — and those calls are your entry point for new maintenance agreements.

When you get the call from a new homeowner whose AC failed six weeks after closing, check the warranty transfer status first. If the previous owner never registered the transfer, the warranty is void for the new owner — and you have a prime conversion opportunity. Explain the transfer policy, offer to process the transfer on the manufacturer's portal, and convert the homeowner to a maintenance agreement on the same visit.

Make transfer verification part of your standard new-customer intake. Ask for the closing date, the previous owner's name, and the serial number. Most manufacturer portals allow you to check transfer eligibility in under two minutes. That two minutes is the difference between quoting a $3,000 compressor replacement and processing a $150 transfer plus a covered repair.

Owning the Warranty File: Recurring Revenue Most Contractors Ignore

The contractor who owns the customer's warranty file owns the customer. Yet almost no contractor positions warranty management as a service. Here is the play: at the install, create a customer warranty dossier that contains the registration confirmation, the manufacturer's warranty certificate, the AHRI certificate for the matched system, the install date, and the serial numbers for both the condenser and the furnace or air handler.

Add the maintenance log to that dossier on every visit. Each filter change, coil cleaning, and charge check gets a dated entry with photos. At the five-year mark, you have a complete service history that makes warranty claims nearly bulletproof — and you have a documented reason to call the customer for a maintenance visit.

Position the dossier as a paid service: the "Warranty Protection Plan," at $150–$250 per year, includes the maintenance visits, the documented log, and the guarantee that the manufacturer's warranty will be honored if a covered failure occurs. The customer is paying for insurance against a claim denial — and you are generating recurring revenue from the one thing every other contractor gives away for free. Your competitors are driving trucks and eating callbacks; you're building an annuity.

Refrigerant, Linesets, and the Items Almost Never Covered

Every contractor needs the list of components that no standard manufacturer warranty covers, because the homeowner will assume they're included. Ductwork is not covered — full stop. The line set is not covered unless a manufacturer defect is provable, which is rare. The thermostat is covered only if it is a factory-installed communicating model, and even then typically only for the first year. Refrigerant is not covered for leaks or lost charge; it is only covered if the failure of a warrantied component caused the loss of charge.

This creates a specific upsell opportunity. The condenser fan motor failure that costs the homeowner $565 in uncovered labor and refrigerant is the moment to pitch the extended labor warranty on the remaining years of the parts warranty. The math is compelling: $300–$800 for 5–10 years of labor protection against a $565 repair today. The customer who just paid $565 for a "covered" repair is the most receptive audience for that pitch.

Frequently Asked Questions

The Bottom Line for the Pro

The warranty is not a service you provide — it is a risk contract you manage. Your registration process, maintenance documentation, and claim photography determine whether the manufacturer pays or the homeowner pays. Your margin math determines whether you accept the manufacturer's reimbursement or quote retail and let the homeowner file the claim themselves.

The contractors who win at warranty work treat it as a system: register at install, document at every maintenance visit, photograph every failure, and run the numbers before saying yes to a claim. That system protects the homeowner's investment, it protects your margin, and it generates the maintenance agreements and repeat calls that keep the service trucks full. Warranty work is not the problem. Poor warranty management is.