Your new AC system just got installed. The contractor hands you paperwork, says something about a “10-year parts warranty,” and leaves. Three years later, the compressor fails. You expect the warranty to cover it. Then you find out you were supposed to register the warranty within 60 days of installation — which nobody told you — and without registration it’s only a 5-year warranty.
This scenario happens constantly in Denver. AC warranties are genuinely confusing, full of conditions, and contain Denver-specific exclusions that most homeowners have no idea about until they try to make a claim. Here’s the complete picture.
⚡ Quick Answer: AC Warranty Basics
- Parts warranty: Manufacturer covers replacement parts for failed components — typically 5–12 years depending on brand and registration
- Labor warranty: Installer covers labor to diagnose and replace failed parts — typically 1–2 years; manufacturer labor warranty rare
- Registration is critical: Most extended warranties (10-year parts) require registration within 60–90 days of install — without it, you get the base 5-year warranty
- Not covered: Hail damage, normal maintenance items (filters, belts), improper installation, unauthorized modifications
- Denver hail: Manufacturer parts warranties typically exclude external physical damage — your homeowner’s insurance covers hail damage, not the HVAC warranty
- To keep warranty valid: Annual professional maintenance, licensed contractor for all repairs, no DIY refrigerant work
The 3 Types of AC Warranties (And What Each Covers)
1. Manufacturer Parts Warranty
This is what most people mean when they say “the AC has a 10-year warranty.” The manufacturer (Carrier, Trane, Lennox, etc.) agrees to supply replacement parts for covered components if they fail within the warranty period. This does not include labor costs — just the parts themselves.
What’s typically covered: compressor, heat exchanger, coils, motors, capacitors, control boards, and most other internal components that fail due to manufacturing defects.
What’s typically not covered: consumable items (filters, belts, UV bulbs), cosmetic damage, damage from external causes (hail, flooding, fire), damage from improper installation, and damage from using non-certified refrigerant.
Registration requirement: This is the critical detail. Most manufacturers offer a base 5-year parts warranty unregistered. Register within 60–90 days of installation and you get the full 10-year (or in some cases 12-year) warranty. If you moved into a home with an existing AC and it wasn’t registered, you may only have the base warranty — or no warranty at all if it’s expired.
2. Contractor Labor Warranty
When parts fail under warranty, someone still has to diagnose the problem, order the part, and install it. That labor cost is your responsibility unless your contractor provides a labor warranty. This is the warranty that varies most between contractors.
We provide a 2-year labor warranty on all new installations. If a covered part fails within 2 years of installation, we’ll diagnose and install the replacement part at no labor charge. Beyond 2 years, you pay the diagnostic fee and labor; the manufacturer covers the part.
Some contractors provide only 1-year labor warranties. Others — especially volume installers — may provide no labor warranty at all (technically legal). Always ask for the labor warranty in writing before signing.
3. Extended Warranty / Service Agreement
Extended warranties (also called service agreements or maintenance plans) go beyond the manufacturer and contractor warranties to cover labor costs for longer periods — often 5–10 years. These are either sold by the manufacturer, the contractor, or a third-party warranty company.
The value of extended warranties varies significantly. For a system with a 10-year parts warranty already, the extended warranty is covering primarily labor costs after year 2 (when the contractor labor warranty expires). Given that most AC component failures happen in years 8–15, a 5–7 year extended warranty may not overlap with the highest-risk period.
What Voids Your AC Warranty
This is the section most homeowners never read until they’re trying to make a claim. These are the most common warranty-voiding actions:
1. Failure to Register
As discussed: if you don’t register within 60–90 days of installation, you lose the extended warranty period. We register every new system we install as part of our installation process — but if you bought a home with an existing system, check the registration status.
2. Non-Permitted Installation
Most manufacturer warranties require the system to be installed by a licensed HVAC contractor with a permit pulled. An unpermitted installation can void the entire parts warranty. Ask your contractor for the permit number before and after installation.
3. DIY Refrigerant Work
Attempting to add refrigerant without an EPA 608 certification, or topping off refrigerant without finding and repairing the leak, can void your warranty. Refrigerant work must be performed by a certified technician. Running a system with incorrect refrigerant charge causes compressor damage that manufacturers will attribute to improper maintenance.
4. Incorrect Refrigerant Type
Using the wrong refrigerant type — mixing R-410A into an R-32 system, or adding refrigerant to a system without knowing its type — voids the warranty immediately and damages the compressor. Only a licensed technician should charge refrigerant.
5. Failure to Maintain (in some contracts)
Some extended warranty contracts require documented annual professional maintenance. If you file a warranty claim and the manufacturer discovers the system has never been serviced, they may deny the claim citing maintenance failure as the root cause. Keep your maintenance records.
6. Physical Damage
Manufacturer parts warranties universally exclude damage from external causes — hail, flooding, fire, accidents, and similar events. If a hailstorm bends your condenser coil fins and the compressor subsequently fails, the manufacturer will inspect for physical damage and may deny the compressor claim if they find evidence of coil damage.
Denver-Specific Warranty Issues: UV and Hail
Denver’s climate creates two warranty challenges that homeowners in other markets don’t face to the same degree:
UV Degradation at 5,280 Feet
Denver’s altitude means UV radiation is approximately 25% more intense than at sea level. UV breaks down refrigerant line insulation, plastic cabinet components, fan blade tips, and — most critically — capacitors. Capacitors are the most UV-sensitive electrical component in your AC system. At Denver’s altitude, capacitor lifespans are often 7–10 years instead of the 10–15 years typical in lower-UV environments.
Denver UV & Warranty Reality
Higher UV intensity at Denver’s altitude vs. sea level
UV degradation of AC components is a normal wear process — it’s not covered by manufacturer warranty. Denver homeowners should expect to replace capacitors and inspect refrigerant line insulation more frequently than homeowners in lower-UV cities. This is maintenance, not a warranty item.
Hail Damage and the Warranty Gap
This is the most important Denver-specific warranty issue. Denver averages 100+ hail days per year. Hail physically damages AC units — bent fins, damaged fan blades, damaged refrigerant line connections. None of this is covered by the manufacturer’s parts warranty, which excludes external physical damage.
The right coverage for hail damage is homeowner’s insurance, not the HVAC warranty. This creates an important responsibility split for Denver homeowners:
- Manufacturing defects → Manufacturer parts warranty
- Hail and physical damage → Homeowner’s insurance
- Labor on warranty repairs → Contractor labor warranty (for first 1–2 years)
- Normal wear and consumables → Your maintenance budget
Extended Warranty: Is It Worth It?
The honest answer: it depends on who’s selling it and what it actually covers. Here’s the analysis for Denver homeowners:
A new AC system with a 10-year parts warranty (properly registered) and a 2-year labor warranty means your financial exposure for component failures in years 3–10 is limited to diagnostic and labor costs — usually $89–$400 per repair. The parts are covered.
An extended warranty that covers labor for years 3–10 has real value if: (1) you have a higher-end system with more expensive components, (2) you’re planning to stay in the home for the full warranty period, or (3) you want financial predictability.
Be cautious about third-party extended warranties from companies you don’t recognize. Third-party warranties have failed to honor claims more frequently than manufacturer or contractor-backed warranties. If you buy an extended warranty, choose one backed by the manufacturer or your installing contractor.
AC Manufacturer Warranty Comparison (2026)
| Brand | Base Parts Warranty | Registered Parts Warranty | Compressor |
|---|---|---|---|
| Carrier | 5 years | 10 years | 10 years (registered) |
| Lennox | 5 years | 10 years | 10 years (registered) |
| Trane | 5 years | 12 years | 12 years (registered) |
| Rheem | 5 years | 10 years | 10 years (registered) |
| Goodman | 5 years | 10 years | Lifetime (registered) |
| Daikin | 5 years | 12 years | 12 years (registered) |
Note: Warranty terms are subject to change. Always verify current warranty terms with your contractor at time of purchase. All brands require registration within 60–90 days for the extended warranty to apply.
Real Case: Westminster Homeowner, March 2025
A Westminster homeowner’s 8-year-old Carrier compressor failed during an unexpected March warm snap. They expected the 10-year warranty to cover a compressor replacement worth $1,800. When we pulled the unit history, the original contractor had never registered the warranty — the homeowner had only a 5-year base warranty, not the 10-year registered warranty. At 8 years, the warranty had expired. Total out-of-pocket: $1,800. Had the unit been registered at install, the compressor would have been a covered part. We now provide warranty registration confirmation in writing to every installation customer the same day as installation.
