HVAC Labor Warranties: How to Write Your Policy (2026)

How to write an HVAC labor warranty policy: parts vs labor coverage, registration, pricing the warranty into installs, exclusions, callbacks, extended labor, and federal warranty law basics.

Every install you sell comes with two promises. The manufacturer promises the parts. You promise the labor. The first one is written by a company with a legal department. The second one is often a line on the proposal that nobody in the shop could explain the same way twice.

That's where the trouble starts: a customer who thought "10-year warranty" meant everything was free for ten years, a tech who isn't sure whether a clogged drain is covered, and warranty visits that never show up in anyone's job costing.

This guide walks through how to write a labor warranty policy you can price, explain, and keep: what the manufacturer covers vs what you cover, why registration matters, how to build the cost of the warranty into your install price (with a worked example), what to exclude, how to handle and track warranty calls, how to sell extended labor coverage, and the federal warranty rules to know.

All worked examples use made-up round numbers to show the math. Swap in your own.

This is general information, not legal advice. The legal section summarizes federal rules as published in the Code of Federal Regulations and FTC guidance as retrieved in September 2026. State law also applies to warranties and service contracts and varies a lot. Have an attorney review your written warranty and any extended coverage you sell before you use it.

Manufacturer parts warranty vs your labor warranty

Keep these two things separate in your head, your paperwork, and your conversations with customers.

• The manufacturer's warranty usually covers defective parts of the equipment it made. It's the manufacturer's promise, on the manufacturer's terms. In most cases it does not pay you for the time it takes to diagnose the problem, pick up the part, and install it. Some manufacturer programs do pay a labor allowance, often tied to dealer status or a specific product line. Read your program's terms rather than assuming.
• Your labor warranty covers your work: the time to diagnose and replace a covered part, and the quality of the installation itself. It's your promise, and every warranty visit is paid for out of your margin.

When a compressor fails in year four, the customer doesn't think in two warranties. They think "my system is under warranty." Your job is to make it clear, in writing and out loud, before they sign:

• which parts are covered by the manufacturer, and for how long;
• which labor is covered by you, and for how long;
• what they'll pay for after your labor warranty ends (even when the part is still free).

A simple table on the proposal does most of the work:

Registration: the step that decides which parts warranty the customer gets

Many manufacturers offer a shorter base parts warranty and a longer one only if the equipment is registered within a set window after installation. Miss the window and the customer may end up with the shorter term, and the customer will blame you, not the manufacturer.

Terms differ by brand, product line, and sometimes by state, and they change. Don't quote a registration window or parts term from memory. Pull the current written warranty for the exact model you're installing from the manufacturer's own site and attach it to the job.

Make registration part of closing the install, not something the customer "should do":

1. Office registers every install within a few days of completion, using the serial numbers captured on the job (outdoor unit, indoor unit or furnace, coil).
2. Save the confirmation (PDF or screenshot) to the customer's record in your field service software.
3. Email a copy to the customer with your labor warranty terms, so they have both in one place.
4. Audit monthly. Compare installs completed vs registrations confirmed. Any gap is a job to fix this week, not next quarter.

Deciding your labor warranty terms

There's no single right term. Pick one you can afford, can staff for, and can explain in one sentence. Decisions to write down:

• Length. Common choices are one or two years on repairs and installs, with longer labor terms on installs as an upgrade or a top-tier feature. Longer terms are a selling point, but only if they're priced in (see below).
• Start date. The install completion date, stated on the invoice.
• What triggers coverage. Failure of a part covered by the manufacturer's warranty, and defects in your workmanship.
• Transfer. Whether the labor warranty moves to a new homeowner if the house sells, and whether that requires any notice. Decide it and write it down either way.
• Response. How the customer requests service and how fast you'll respond during peak season. Be realistic. "Next available appointment, prioritized over non-warranty calls" is a promise you can keep. "Same day" in July may not be.
• Conditions. If you require maintenance to keep the labor warranty in force, say so plainly and say what counts (for example, maintenance by any licensed contractor, with records). See the legal section below before you tie coverage to your own company's services.

If you sell good-better-best options, labor warranty length is one of the cleanest ways to separate the tiers. See our [HVAC good-better-best pricing guide](/guides/hvac-good-better-best-pricing-2026) for how to build the tiers.

Pricing the labor warranty into your installs

A labor warranty is not free. It's a future cost you take on at the time of the sale. If it isn't in the price, it comes out of profit years later, often in the busiest weeks of the season.

The method: estimate the expected warranty cost per install, add it to the job cost, then price the job to your normal margin.

Step 1: Cost of one warranty visit

Made-up numbers for a typical warranty visit on a residential system:

Use your burdened labor rate, not the wage. Our free [HVAC labor burden calculator](/tools/hvac-labor-burden-calculator) and [service truck cost calculator](/tools/hvac-service-truck-cost-calculator) give you both numbers.

Step 2: Expected visits per install over the term

This is the number that matters most, and the only honest source for it is your own history. Count warranty labor visits on installs over the last few years and divide by installs completed in the same period. If you don't have that data yet, start tracking now (see below) and use a cautious estimate in the meantime.

For the example, assume:

• 2-year labor warranty: 0.4 expected warranty visits per install over the term
• 10-year labor warranty: 1.2 expected warranty visits per install over the term

These are made-up planning numbers, not industry figures.

Step 3: Expected cost per install, then price

Why divide by 0.55? If you price installs to a 45% gross margin, cost is 55% of price, so every dollar of cost needs $1 / 0.55 of price to keep the margin whole. If you price with a different method, use it the same way you'd treat any other job cost.

Put the expected warranty cost in as its own line in your install cost build-up, so it never gets dropped when someone trims a bid. Our free [HVAC install job pricing calculator](/tools/hvac-install-job-pricing-calculator) is a good place to add it alongside equipment, labor, and overhead.

Step 4: Set the money aside

Warranty costs arrive years after the revenue. If a shop does 150 installs a year on the 2-year terms above, that's 150 x $86 = $12,900 a year of future warranty work already sold. Some owners move that amount into a separate reserve account each month so a bad warranty year doesn't hit cash flow. Talk to your accountant about how to record it.

Check the estimate every year. If actual warranty visits per install run higher than your estimate, raise the number (and look at your install quality). If they run lower, you've earned some room on price.

What to exclude

Exclusions keep your warranty for what it's meant to cover: failures of the equipment and your own workmanship. Common exclusions to consider, written in plain words:

• Damage from outside causes: power surges, lightning, flooding, fire, storms, pests, and physical damage.
• Lack of maintenance: clogged filters, dirty coils, and drain clogs caused by skipped maintenance. State what maintenance you expect and how the customer can show it was done.
• Work by others: failures caused by changes or repairs made by another contractor or the homeowner after your install. (Write this as "damage caused by," not "any work by others voids the warranty." See the legal section.)
• Existing parts of the system you didn't install or replace: ductwork, wiring, and components you reused, unless you specifically agree to cover them.
• Normal wear items: filters, belts, fuses, and similar consumables.
• Access costs: cranes, lifts, or unusual access (attics without a floor, rooftops) beyond a normal visit. If you exclude these, say so up front.
• After-hours premiums: whether warranty calls outside normal hours are covered or billed at the premium portion only.
• Diagnosis of non-covered issues: if the problem turns out not to be covered (a tripped breaker, a thermostat setting), the normal diagnostic fee applies. Say this plainly so there's no surprise.

Don't exclude so much that the warranty means nothing. A list of exclusions longer than the list of what's covered makes the customer trust you less, not more.

Handling warranty calls

A warranty call is a callback with a different label. Handle it with the same discipline. Our guide on [how to reduce HVAC callbacks and rework](/guides/hvac-callbacks-reduce-rework-2026) covers the checklists, reviews, and tech pay side in detail.

Build a short process:

1. Intake. The dispatcher checks the install date and warranty terms in the customer record before booking. Tell the customer on the phone what's likely covered and what isn't, including the diagnostic fee if the problem turns out not to be covered.
2. Diagnosis. The tech documents the failed part (photos, model and serial numbers, readings) and whether the cause is a covered failure, workmanship, or an excluded cause.
3. Manufacturer claim. The office files the parts claim with the distributor or manufacturer, following their process and deadlines, and tracks it until the credit arrives. Unfiled or rejected claims are money you already spent.
4. Customer communication. Explain what was covered, what wasn't, and why, in writing on the invoice, even when the invoice is $0.
5. Review. If the cause was workmanship, it goes into your callback review like any other rework.

Tracking warranty calls

Set your field service software up so warranty work is counted, not remembered:

• A "Warranty" job type (separate from "Callback" if you want to tell the two apart), linked to the original install job.
• Reason codes: manufacturer part failure, workmanship, excluded cause (billed), no problem found.
• $0 revenue, full cost tracked: tech hours, truck time, and shop materials, so warranty cost shows up in job costing.
• Manufacturer claim status: filed, approved, credited, rejected, with the credit amount.
• A monthly report: warranty visits, cost, claims outstanding, and warranty visits per install by install crew and equipment line.

After a year, you'll have your own expected-visits number for Step 2 above, and you'll know which equipment lines and which crews generate the most warranty work.

Selling extended labor coverage

Extended labor coverage (labor protection beyond your standard term) is a common add-on on installs. There are two ways to offer it:

• Included in a tier. Your top tier comes with a longer labor term built into the price. This is a warranty that's part of the sale, priced with the method above.
• Sold separately for an added fee. An optional agreement the customer pays extra for, often through a third-party plan provider. Under federal rules this is generally treated as a service contract, not a warranty (see the legal section), and many states regulate service contracts. If you sell a third-party plan, read the provider's terms, know who is responsible for paying claims, and check your state's rules before you offer it.

Pricing extended coverage uses the same math. With the example numbers above, extending from 2 years to 10 years adds 1.2 - 0.4 = 0.8 expected visits, or 0.8 x $215 = $172 of expected cost. At a 45% gross margin that's $172 / 0.55 = $312.73 of price. If a third-party plan costs you less than your own expected cost and pays claims reliably, it can be the better option. If not, carrying it yourself may be.

How to present it honestly:

• Show what the customer pays after the labor warranty ends, using a realistic repair, so they can judge the value themselves.
• Don't pressure. An option that's explained well and declined is better than one sold hard and resented at the first claim.
• Put the terms in writing at the time of sale, with the start date, end date, and exclusions.

Writing it plainly

Your labor warranty should fit on one page and read like you'd explain it at the kitchen table. A structure that works:

1. Title ("Limited Labor Warranty" is the usual choice; see the legal section on "full" vs "limited").
2. Who is covered. The original homeowner, or anyone who owns the home during the term.
3. What is covered. Labor to repair failures of covered parts, and defects in our workmanship.
4. How long. The term, starting on the install completion date.
5. What we will do. Diagnose and repair at no charge for labor.
6. What is not covered. Your exclusion list.
7. How to get service. Phone number, email, or online request, and what information to have ready.
8. Your other rights. The standard state-law statements (see below).

Tips:

• Short sentences. "We" and "you." No "heretofore."
• Define "workmanship" with examples (brazed joints, drain line, electrical connections we made).
• Use the same terms on the proposal, the invoice, and the warranty document. If the proposal says "10-year labor," the warranty document can't say "10-year labor on compressors only."
• Train your salespeople and techs to describe it the same way. Hand them the one-pager.

The legal side: federal warranty law basics

The main federal warranty law for consumer products is the Magnuson-Moss Warranty Act, enforced by the Federal Trade Commission, with FTC rules at 16 CFR Parts 700 through 703. What follows is a summary of the parts most relevant to an HVAC contractor. It is not complete and it isn't legal advice.

Does the Act apply to your warranty?

HVAC equipment is covered as a consumer product. The FTC's interpretation says the definition "brings under the Act separate items of equipment attached to real property, such as air conditioners, furnaces, and water heaters." It also notes that coverage "does not extend to the wiring, plumbing, ducts, and other items which are integral component parts of the structure." [16 CFR 700.1(c)-(d)]

Whether your particular warranty is covered depends on what it promises:

> "warranties on services are not covered. Therefore, warranties which apply solely to a repairer's > workmanship in performing repairs are not subject to the Act. Where a written agreement warrants > both the parts provided to effect a repair and the workmanship in making that repair, the warranty > must comply with the Act and the rules thereunder." [16 CFR 700.1(h)]

The FTC's business guide makes the same point and adds that the Act "does not require any business to provide a written warranty," but "once a business decides to offer a written warranty on a consumer product, it must comply with the Act." It also says the Act covers only warranties on consumer products, not products sold for resale or commercial purposes. [FTC, Businessperson's Guide to Federal Warranty Law]

So a labor-only warranty may fall outside the Act, while a combined "parts and labor" warranty that you issue on consumer equipment falls inside it. Many shops find it simpler to write their warranty as if the Act applies. Ask your attorney which applies to your wording.

"Full" or "Limited"

Under Section 103 of the Act, written warranties on consumer products costing more than $10 must be titled either "Full (statement of duration) Warranty" or "Limited Warranty." [16 CFR 700.6(a)]

The FTC guide says a warranty is "full" only if all five of these are true: you don't limit the duration of implied warranties; you provide warranty service to anyone who owns the product during the warranty period; you provide warranty service free of charge; you provide a replacement or full refund (at the consumer's choice) if you can't repair the product after a reasonable number of tries; and you don't require consumers to do anything as a precondition for service except notify you, unless you can show the duty is reasonable. If any of these isn't true, the warranty is "limited." [FTC, Businessperson's Guide to Federal Warranty Law]

That's why most contractor warranties are titled "Limited."

What a written warranty has to disclose

For consumer products costing more than $15, the FTC's Disclosure Rule requires the warrantor to "clearly and conspicuously disclose in a single document in simple and readily understood language" items including: who the warranty covers if it's limited to the original buyer; what is covered and excluded; what the warrantor will do and what it will pay for; when the warranty starts and how long it lasts; a step-by-step explanation of how to get warranty service, with a name and address or a free phone number; any limits on the duration of implied warranties or exclusions of incidental or consequential damages, with the required state-law statements; and the statement: "This warranty gives you specific legal rights, and you may also have other rights which vary from State to State." [16 CFR 701.3(a)]

Part 702 requires written warranty terms on consumer products costing more than $15 to be available to the buyer before the sale. [16 CFR 702.3] For a contractor, that points to including the warranty document with the proposal, not just the final invoice.

Registration cards

If returning a registration card is a condition of coverage, the warranty has to say so. [16 CFR 701.4] In a full warranty, requiring registration as a condition of coverage is not allowed: "a provision such as, 'This warranty is void unless the warranty registration card is returned to the warrantor' is not permissible in a full warranty." [16 CFR 700.7(b)] This is one reason manufacturers that condition longer terms on registration generally title those warranties "limited."

Tying coverage to your own service

The FTC rules prohibit conditioning warranty coverage on the use of a specific brand's parts or service unless they're provided free under the warranty. The rules give this example of a prohibited provision: "This warranty is void if service is performed by anyone other than an authorized 'ABC' dealer and all replacement parts must be genuine 'ABC' parts." The same section says this "does not preclude a warrantor from expressly excluding liability for defects or damage caused by 'unauthorized' articles or service; nor does it preclude the warrantor from denying liability where the warrantor can demonstrate that the defect or damage was so caused." [16 CFR 700.10(c)]

In practice: if you require maintenance to keep your warranty in force, be careful about requiring that it be your paid maintenance. Excluding damage actually caused by someone else's work is the safer way to write it.

Other points worth knowing

• Implied warranties. The FTC guide says federal law prohibits disclaiming implied warranties on a consumer product "if you offer a written warranty for that product" or sell a service contract on it. With a limited warranty, you may limit implied warranties to the length of your written warranty. [FTC, Businessperson's Guide to Federal Warranty Law]
• "Final decision" language. A warrantor "shall not indicate in any written warranty or service contract either directly or indirectly that the decision of the warrantor ... is final or binding in any dispute," nor "state that it alone shall determine what is a defect." [16 CFR 700.8]
• Warranties vs service contracts. An agreement that "calls for some consideration in addition to the purchase price of the consumer product, or which is entered into at some date after the purchase," is a service contract, not a warranty. [16 CFR 700.11(c)] If you sell one, the FTC guide says the Act requires you to "list conspicuously all terms and conditions in simple and readily understood language." [FTC, Businessperson's Guide to Federal Warranty Law]
• Passing along a manufacturer's warranty. A seller that only passes along a manufacturer's warranty is generally not liable for that warranty's compliance, but the seller's own "written and oral representations" can create obligations. [16 CFR 700.4] Be careful what your salespeople promise about the manufacturer's coverage.

State law adds more: implied warranty rules, contractor licensing rules, and service contract regulation vary by state. The FTC guide itself suggests contacting "a private attorney or the offices of the attorneys general in the states where you do business" for state specifics.

A 30-day plan

• Week 1: Write down your current labor warranty terms exactly as they're sold today. Compare the proposal, invoice, and anything your salespeople say.
• Week 2: Pull warranty and callback visits on installs from your software and estimate cost per visit and visits per install. Add the expected warranty cost as a line in your install pricing.
• Week 3: Draft a one-page "Limited Labor Warranty" using the structure above. Set up the warranty job type, reason codes, and registration audit in your software.
• Week 4: Have an attorney review the document and any extended coverage you sell. Train the team on how to explain it.

Related guides and tools

• [How to Reduce HVAC Callbacks and Rework](/guides/hvac-callbacks-reduce-rework-2026): checklists, callback reviews, and tracking.
• [HVAC Good-Better-Best Pricing](/guides/hvac-good-better-best-pricing-2026): use labor warranty length to separate your tiers.
• [HVAC install job pricing calculator](/tools/hvac-install-job-pricing-calculator): add expected warranty cost to your install price.
• [Free HVAC business calculators](/tools). No email needed.

Labor warranty terms differ from shop to shop; for feedback on your one-page policy, share it in the Growth Room Discord.

Sources

• eCFR, 16 CFR Part 700, Interpretations of Magnuson-Moss Warranty Act, text retrieved September 2026 (sections 700.1, 700.4, 700.6, 700.7, 700.8, 700.10, 700.11)
• eCFR, 16 CFR Part 701, Disclosure of Written Consumer Product Warranty Terms and Conditions, text retrieved September 2026 (sections 701.3, 701.4)
• eCFR, 16 CFR Part 702, Pre-Sale Availability of Written Warranty Terms, text retrieved September 2026 (section 702.3)
• Federal Trade Commission, Businessperson's Guide to Federal Warranty Law, retrieved September 2026