Parts and Labor Warranty: What Lifetime Actually Owes

The answer to what a "10-year warranty" covers is printed in a parenthesis most people skip. Trane's residential furnace warranty, form GW-FURN-2201A, opens by extending coverage to the original purchaser "only for parts (but not labor) replaced as a result of manufacturing defects." Six words inside brackets, first sentence of the document, and they are the difference between a free repair in year eight and a bill for everything except one component's wholesale price.

This page reads that parenthesis across five documents — Carrier, Trane, Goodman, Lennox, and, because it defines its terms better than any HVAC certificate, GAF's shingle warranty — all opened on 3 September 2026. The usual caution applies twice over here: I hold no licence and diagnose nothing, and each certificate below covers a specific list of model numbers, not a brand. The one in your owner's packet is the one that binds. What follows is how to read it.

"Parts" pays for the part and nothing that touches it

Carrier's limited warranty for R-454B condensing units (catalog no. ACHP-C454-01WAR, edition 11/23) states the whole remedy in one sentence: if a part fails due to defect during the warranty period, the company "will provide a new or remanufactured part, at Company's option, to replace the failed defective part at no charge for the part." Then the exclusion list does the real work. Item 1: "labor or other costs incurred for diagnosing, repairing, removing, installing, shipping, servicing or handling of either defective parts, or replacement parts, or new units." Item 11: "any cost to replace, refill or dispose of refrigerant, including the cost of refrigerant."

Walk that through an actual failure. A compressor dies in year eight of a registered ten-year parts warranty. The compressor itself: covered. The diagnostic visit that identified it, the hours of brazing and vacuum work to swap it, the recovery and recharge of several pounds of refrigerant that exclusion 11 prices on you by name — all yours. Lennox's dealer guide puts a number on the split, from its own customer research: "when a failure occurs, the average cost of repair is 85% labor and only 15% parts," and over 80 percent of the negative calls to Lennox consumer support are about labor charges (Warranty Your Way User Guide v2.0, April 2025, page 1). By the manufacturer's own arithmetic, the ten-year headline covers the smaller slice of the invoice.

Goodman's furnace certificate (part no. PWCFURNUQNTE, 04/2025, read from a dealer-hosted copy — Goodman's own site serves the file through a viewer that blocks direct download) says the same thing under the heading What Won't Daikin Do To Correct Problems?: no payment for "labor, freight, or any other cost associated with the service, repair, or operation of the unit," and, for good measure, no lodging or transportation charges. Trane's version adds that you pay all shipping and handling for the replacement part.

None of this is hidden. It is simply never on the bid, which prints "10 YR PARTS WARRANTY" and moves on.

Labor promises come from two different parties, on different paper

So who does cover the hours? Two candidates, and it matters which one signed.

The installing contractor. The workmanship or labor warranty on the installation itself lives in your contract with the installer — one year and two years are common offers, but there is no standard, which is exactly why it belongs as a written line on the bid rather than a verbal assurance. It is one of the fourteen lines a complete replacement bid should contain. This promise is only as durable as the company behind it. Lennox's program terms make the underlying economics visible: participating dealers are responsible for warranting the first 90 days after installation at their own cost before any manufacturer reimbursement begins.

The manufacturer, through an optional program. Several brands now attach labor options to the registration decision, which means the choice expires with the same 60-to-90-day window that sets your parts term.

Carrier's Consumer Choice terms carry a sentence that explains the whole structure, in capitals: "CARRIER IS NOT LIABLE FOR ACTS BY SERVICE PROVIDERS." The parts and labor service "is being provided by independent dealers." Even when the manufacturer's name is on the labor plan, the manufacturer is reimbursing a contractor, not fixing your furnace. Lennox says the same of Comfort Shield: sold and administered by an independent third party, Lennox not responsible for coverage disputes. When a bid says "10-year parts and labor," the only way to know who owes the labor is to ask which of these three pieces of paper — contract, registration option, purchased service agreement — the second half of that sentence lives on.

Three certificates, three different things called "lifetime"

Here the vocabulary gets genuinely slippery, because the same word is doing three jobs.

GAF defines it. The Shingle & Accessory Limited Warranty states: "The word 'Lifetime' means as long as you, the original owner(s) [or the second owner(s) if coverage was properly transferred during the Smart Choice® Protection Period], own the property where the shingles are installed." Not your lifetime — your ownership. Sell the house and the lifetime ends. And it applies "only to shingles installed on a single-family detached residence owned by individuals"; for a corporation, condo association, school, or apartment building, the same shingles carry 40 years instead. (gaf.com refuses non-browser downloads, so these quotes were checked against an Internet Archive capture, January 2026, of the current form — RESWT160L-1224, effective for GAF products installed after 1 January 2025. Pull the live copy from GAF's document library for your own claim.)

Trane prints it without defining it. Table 1 of GW-FURN-2201A gives the S9V2, S9X1, S9X2, S9B1, and L8V1 furnaces a heat exchanger term of 20 years unregistered and "Lifetime" registered. Whose lifetime, ending when? The form never says. What it does say is that the warranty extends to the original purchaser, requires the product to stay in its original location, and transfers to a home's buyer only within 90 days of closing for a fee — $99 by Trane's current warranty page. Read together, the practical shape is close to GAF's definition, but you are inferring it, and the certificate leaves you to.

Goodman never writes the word at all. The furnace certificate covering the GMVC96 and its siblings — equipment routinely sold with a "lifetime heat exchanger warranty" on the proposal — contains no instance of "lifetime." Instead it writes remedies with dates. Registered, owner-occupied: heat exchanger fails in the first 10 years, Daikin furnishes a whole new equivalent unit, once. Fails within 20 years, a replacement heat exchanger free. Fails after year 20 but "within the first 99 YEARS after the installation date," a replacement heat exchanger free, once only. All of it lasts only "for as long as the original registered owner or his or her spouse ... owns and resides in the residence," and none of it includes the labor to swap a heat exchanger, which is most of what a heat exchanger swap costs. On the non-owner-occupied version in the same PDF — the one that governs a rental — the registered heat exchanger term is a flat 20 years and the unit-replacement remedy is absent.

Three documents, three answers. "Lifetime" is not a length of time. It is a pointer to a definition, and sometimes the definition is missing.

"Prorated" is a schedule, not a yes-or-no

The last phrase worth chasing to its source is prorated, and GAF's certificate is the cleanest specimen because it prints the formula.

During the non-prorated window GAF names the Smart Choice Protection Period — 10 years on Lifetime shingles — a valid manufacturing-defect claim gets replacement products plus "the full reasonable cost of labor to repair or re-cover," though never tear-off or disposal. Then the cliff: "After the Smart Choice Protection Period: Labor will no longer be covered," and the materials contribution is cut by use, calculated as months elapsed over months in the term, with a Lifetime term "deemed to be 600" months for years 11 through 40. GAF's own example: claim at 25 years, reduction of 300/600, contribution 50 percent — of materials only. From year 41, 20 percent flat.

So a "Lifetime" shingle warranty is, in cash terms: ten strong years, then a declining materials rebate you must still pay someone to install. Contrast the HVAC parts warranties above, which are not prorated — Carrier's year-nine compressor claim is worth a whole compressor, same as year one — but end at a wall instead. Neither structure is a trick. They are just different shapes of the same shrinking obligation, and the word on the bid tells you which shape you are buying only if you look it up.

Match every warranty line on the bid to a form number

The procedure, before signing:

• Ask the contractor to write the warranty document numbers on the bid — the parts certificate (ACHP-C454-01WAR, GW-FURN-2201A, PWCFURNUQNTE, or your brand's equivalent) and, separately, whatever paper stands behind any labor promise. A bid that says "10-year warranty" without a form number is quoting a rumor.
• For each labor line, identify the party: installer's contract, manufacturer registration option, or third-party service agreement. Different party, different claim procedure, different survival odds.
• Note every deadline in one place. On the documents above: registration at 60 or 90 days, Carrier labor claims within 45 days of failure, Trane warranty claims within 90 days of failure, transfer windows at 60 days (GAF) or 90 days (Trane) from closing.
• Confirm the start date. Several of these clocks fall back to the manufacture date decoded from the serial number plus 60 or 90 days when the installation date cannot be proven, so keep the invoice that proves it.

Every phrase this page examined resolved to a sentence in a public PDF. The bid's version of the warranty is a summary written by the party selling the equipment; the certificate is the contract. Read the contract.