When homeowners ask me about warranties, I can tell they expect a simple answer. Ten years, covered, done. But warranties have enough fine print that I think it’s worth laying out how they actually work. Not to scare anyone, but because understanding the structure helps you ask better questions before you sign anything.
This is what I explain to customers before we start a job.
There Are Two Separate Warranties on Every Install
The first thing to understand is that a warranty on an HVAC system is actually two distinct things:
The manufacturer’s parts warranty covers the physical components inside the equipment. If a part fails because of a defect in materials or workmanship, the manufacturer supplies the replacement at no cost. This warranty comes from the company that built the equipment: Bosch, Carrier, Trane, Daikin, whoever made the unit.
The labor warranty covers the cost of the technician who comes to diagnose and install that replacement part. This one does not come from the manufacturer. It comes from the contractor who did the installation. Manufacturer warranties almost never include labor.
That distinction matters because the labor is often the larger expense. A compressor under warranty costs you nothing for the part, but if no one is covering the labor, you’re still paying someone to come out, pull the system apart, and install it. Depending on where you are and what the repair involves, that can run several hundred dollars or more.
So when a contractor says “10-year warranty,” the honest question is: ten years on what?
The Registration Trap
Here’s something that catches a lot of homeowners off guard: with most major HVAC brands, the length of your parts warranty depends entirely on whether the equipment gets registered within a specific window after installation.
The standard structure across most brands looks like this:
- Registered within the deadline: 10 years on parts
- Unregistered: 5 years on parts
That deadline is usually 60 to 90 days. Miss it, and you’ve given up half your warranty before the system ever runs a full heating season.
Trane, Carrier, Lennox, Daikin, and Mitsubishi all work this way to varying degrees. Some brands are even more differentiated. Mitsubishi, for example, has a three-tier structure where the coverage you get depends on both registration and the certification level of the contractor who installed it. A Diamond Contractor install plus registration gets you 12 years. A standard install without registration gets you 5.
Bosch works differently. Their parts warranty is 10 years regardless of registration. That’s explicitly stated in their documentation. However, registration does unlock labor reimbursement coverage from Bosch’s side, so it’s still worth doing. I handle registration for every system I install. Bosch uses contractor-side registration, so the installer does it, not the homeowner. You don’t need to do anything.
For systems from other brands, I’d strongly recommend verifying that registration was completed before your window closes. Don’t assume your contractor did it. Every major manufacturer has a lookup tool where you can confirm by entering your model and serial number.
What the Parts Warranty Actually Covers
A manufacturer’s parts warranty covers components built into the unit at time of manufacture. That includes the compressor, coils, refrigerant circuit, controls, and other factory-installed parts. If any of those fail due to a defect, the manufacturer supplies the replacement.
What it does not cover is a longer list.
Labor. As I mentioned, labor is almost universally excluded from manufacturer warranties. The part is free. The technician is not.
Refrigerant. Even if a covered part caused a refrigerant leak, the refrigerant itself is a consumable. You’ll pay for the recharge.
Maintenance items. Filters, belts, capacitors, and other components that wear out with normal use are not covered. The warranty is for defects, not for things that age out.
Installation errors. If a system was installed incorrectly and that installation error causes a part to fail, the manufacturer can and will deny the claim. The equipment has to be installed by a licensed HVAC contractor meeting the regulatory requirements of your jurisdiction. And it has to be installed correctly. This is one of the places where a bad install can cost you your warranty.
Physical damage. Floods, lightning, impact damage, acts of nature — excluded.
Neglect. A manufacturer can deny a claim if the system shows clear evidence of being neglected. More on that below.
Moving the system. Bosch’s warranty, for example, explicitly excludes systems that have been relocated from their original installation address.
What Voids a Warranty
There are a few specific things that will end your warranty coverage outright, and some of them happen more often than people realize.
Using the wrong refrigerant. This is a real issue right now. The industry is in the middle of a transition from R-410A to newer refrigerants like R-454B. If a technician charges your system with the wrong refrigerant, you’re looking at potential equipment damage and a voided warranty. Always use a contractor who knows what refrigerant your specific unit requires.
No maintenance records. Annual professional maintenance is typically required to keep a warranty valid, and you need documentation to prove it happened. If you call in a warranty claim and there’s no service history, the manufacturer has grounds to deny it. This is the most common way I see people lose coverage.
Non-approved parts. If a repair is done using components that aren’t approved for that equipment, and a subsequent failure is related to that repair, the warranty claim can be denied.
Unauthorized modifications. Bypassed safety controls, altered wiring, and similar changes will end coverage.
My Labor Warranty
Every system I install comes with a 10-year labor warranty from me. Here’s what that means specifically.
The warranty covers any issue that traces back to installation quality: refrigerant leaks, condensation leaks, anything that a proper installation should have prevented. If something goes wrong and it’s attributable to how the system was put in, I come back and fix it.
The first year is fully covered at no charge.
From year two through year ten, the warranty stays active as long as I perform the annual maintenance visit. The cost is a standard maintenance visit, nothing more. That annual visit is what lets me keep an eye on the system and catch anything before it becomes a serious problem. It also keeps the Bosch parts warranty intact, since manufacturers require documented maintenance history.
This structure is intentional. A 10-year labor warranty that requires no maintenance would create an incentive for me to do sloppy work and bet that nothing goes wrong for a decade. The maintenance requirement means I stay involved. If something I did is causing a slow problem, I’ll find it during a visit before it escalates into a failure.
The full terms are on the warranty page.
My Honest Take on Extended Warranties
Extended warranties and service contracts are sold as a way to add labor coverage beyond what the manufacturer provides. I don’t sell them.
My reason is simple: if I’m already providing a 10-year labor warranty on my installs, an extended warranty is a redundant product. You’d be paying for coverage you already have.
For homeowners with systems installed by other contractors, extended warranties are worth evaluating honestly. The coverage they add is real. The question is whether the cost makes sense given how reliable modern equipment is and what the labor exposure would actually be.
The math usually favors the seller. Extended warranties are profitable because equipment failure in the first 10 years is uncommon on a well-installed system. But for someone who couldn’t absorb a large unexpected repair bill, the peace of mind may be worth the cost. Just read what’s actually covered before you sign.
A general rule of thumb worth keeping: don’t pay more than about 20% of your system’s installation cost for an extended warranty. If the number is higher than that, the seller is making most of the profit.
What to Ask Before You Hire a Contractor
Warranty terms are easy to misrepresent, and most homeowners don’t push back on them. Here are the specific questions worth asking:
How long is your labor warranty, and what does it cover? Get the scope. Does it cover anything that goes wrong, or just issues tied to the installation? Are there conditions that keep it active?
Who handles equipment registration, and when? If the contractor says they’ll handle it, ask for written confirmation after the job is done. If it’s your responsibility, calendar the deadline the day the system goes in.
What refrigerant does this unit use? Know what’s in your system. If you ever call someone else for a repair, you’ll want to be able to tell them immediately.
What maintenance does the manufacturer require to keep the warranty valid? Not every manufacturer requires annual professional maintenance, but many do. Know what yours needs before you skip a year.
Have you done a Manual J load calculation for this system? This is less about warranty and more about installation quality, but it’s related. An improperly sized system causes performance problems that can stress components and eventually lead to failures. A contractor who doesn’t size the system correctly is also less likely to be meticulous about the other details that affect warranty validity.
A contractor who gives you straight answers to these questions without hedging is one who understands the work and stands behind it. That’s who you want doing the install.
If you’re in Kelso, Longview, or the surrounding area and want to talk through what coverage looks like on a specific project, call me or reach out through the contact page. Happy to answer questions before you decide anything.