HVAC Warranty Guide: Parts, Labor, and Manufacturer Coverage Explained

Layer 1: Manufacturer Parts Warranty

What it covers: Defective parts — compressor, heat exchanger, blower motor, control board, coil, capacitors, valves, and other components. What it pays for: The part itself. Not labor, not refrigerant, not the service call.

Layer 2: Compressor and Heat Exchanger Warranties

These get their own layer because they're often marketed separately — and because the compressor (in an AC or heat pump) and the heat exchanger (in a furnace) are the most expensive single components to replace.

• Compressor warranties typically run 10 years on registered residential equipment for most major brands (Trane XV, Carrier Infinity, Lennox XC25 sometimes longer).
• Furnace heat exchanger warranties are often lifetime or 20-year on mid-to-upper tier equipment. A cracked heat exchanger can allow carbon monoxide into living space — a lifetime warranty is a meaningful differentiator when comparing furnace quotes.
• What "lifetime" actually means: Applies to the original registered purchaser at the original installation address. It does NOT transfer to a new owner.

Layer 3: Contractor Labor Warranty

What it covers: The technician's time to diagnose and replace a failed part under the manufacturer's parts warranty. Who honors it: The installing contractor, not the manufacturer.

Why this matters: A manufacturer parts warranty covers the failed compressor. But pulling and replacing a compressor is 4–8 hours of skilled labor, plus refrigerant recovery and recharge — often $800–$2,000 even when the part is covered. The manufacturer doesn't pay that. Your contractor's labor warranty does — if you have one.

A 1-year labor warranty is the industry floor. This is one of the questions on our contractor hiring checklist.

The Registration Requirement: Don't Skip This

• Most major manufacturers require registration within 60–90 days of installation to unlock the extended 10-year warranty
• Registration is done online at the manufacturer's website using the model and serial number
• The installing contractor often handles registration as part of their process — ask them to confirm and provide the confirmation number
• If the deadline passes, there's usually no way to retroactively extend coverage
• Warranty lookup: Most major manufacturers have a warranty lookup tool where you can enter the serial number to check status

What Voids an HVAC Warranty

• No documentation of annual maintenance. Most manufacturers require annual professional service to keep the warranty valid. Keep every service invoice — it's evidence if you need to file a warranty claim. See our maintenance schedule guide for what annual service should include.
• Unauthorized repairs. If someone other than a licensed HVAC technician opens the equipment and performs a repair, and a subsequent failure is linked to that work, the warranty may be voided.
• Refrigerant mismatch. Adding the wrong refrigerant type (R-22 vs R-410A, etc.) voids both the compressor warranty and manufacturer's parts coverage.
• Incorrect installation / no permit. If the original installation didn't comply with local codes, the manufacturer can argue the installation was code-noncompliant and void the warranty. This is another reason permits matter. See our permit guide.
• Improper sizing. An oversized or undersized system that short-cycles or runs continuously accumulates wear faster than designed. Competent contractors perform a Manual J load calculation before sizing equipment.

Home Warranty vs. Manufacturer Warranty vs. Contractor Warranty

Home warranties (annual subscriptions from third-party companies) have service call fees ($75–$150 per claim), coverage caps (often $1,500–$3,000 for HVAC), and send their own technicians. They can make sense for older equipment out of manufacturer warranty — but they are not a substitute for a manufacturer parts warranty or contractor labor warranty on new equipment.

Transferring Your Warranty at Home Sale

• Most standard 10-year parts warranties are non-transferable — they cover the original registered owner only
• Some brands allow transferability within a specific window (30–90 days of closing) for a small administrative fee ($25–$75)
• Lifetime heat exchanger warranties are almost universally non-transferable
• Contractor labor warranties are almost always non-transferable
• For buyers: Ask the seller for the equipment brand, model, serial number, and installation date. Look up warranty status yourself using the manufacturer's warranty lookup tool. Assume labor coverage does not transfer.

Frequently Asked Questions

How long is the warranty on a new HVAC system?

It depends on the brand, equipment tier, and whether you register. Registered equipment from most major brands gets 10 years on parts. Unregistered drops to 5 years. Heat exchangers on mid-to-upper furnaces often carry 20-year or lifetime coverage for the original owner. Labor warranty from the installing contractor is typically 1–5 years standard.

What is not covered by an HVAC warranty?

Labor costs (unless you have a separate contractor labor warranty), refrigerant, service call fees, damage from improper installation, damage from lack of maintenance, damage from unauthorized repairs, and failures caused by external factors (power surges, flood, fire). The manufacturer parts warranty covers defective parts only.

Do I need to register my HVAC system?

Yes, if you want the full warranty term. Most manufacturers require registration within 60–90 days of installation to activate the 10-year extended coverage. Without registration, most brands default to 5 years. Registration is free and takes about 5 minutes online.

Does an HVAC warranty transfer when I sell my home?

Usually not for labor coverage, and it depends on the manufacturer for parts coverage. Some brands allow a parts warranty transfer within 30–90 days of closing for a small fee ($25–$75). Lifetime heat exchanger warranties are almost always non-transferable. Check your specific manufacturer's terms before listing.

Who pays for labor when a part fails under warranty?

The manufacturer pays for the defective part. Labor costs — the technician's time to diagnose and replace it — are typically your responsibility unless your installing contractor provided a labor warranty. Pulling and replacing a compressor is 4–8 hours of skilled labor, plus refrigerant recovery and recharge, which can run $800–$2,000 even when the part itself is covered.

What voids an HVAC warranty?

The most common voidances: missing annual professional maintenance records, refrigerant type mismatch, unauthorized repairs (non-licensed work on the equipment), installation that didn't comply with local codes (unpermitted work), and damage from external causes. Keep service records and use licensed technicians for all repairs.

Is a home warranty the same as a manufacturer warranty?

No. A manufacturer warranty covers defective parts on the specific equipment and is included with purchase. A home warranty is a paid annual subscription from a third-party company that covers mechanical breakdowns across your home's systems — with its own exclusions, service call fees ($75–$150 per claim), and coverage caps. They serve different purposes and one does not replace the other.

How do I know if my HVAC warranty is still active?

Most major manufacturers have an online warranty lookup tool where you can enter the equipment serial number to check registration status and remaining coverage. Alternatively, call the manufacturer's customer service line with the serial number.