What Voids an AC Warranty During Repairs?

An air conditioning system is a significant investment for any homeowner or business, which is why most systems come with a manufacturer’s warranty designed to protect that investment for several years. However, warranties aren’t a free pass for all issues—certain actions or oversights can void your AC warranty altogether, leaving you responsible for costly repairs or replacements. At D-N-D Services, we’ve proudly served Rockwall and surrounding areas since 1997, and we’ve seen many cases where customers unknowingly voided their warranties. Here’s what you need to know about what can void an AC warranty during repairs—and how to protect your coverage.

1. Unlicensed or Unauthorized Repairs

One of the fastest ways to void your AC warranty is by allowing unlicensed or unauthorized individuals to perform repairs on your unit. Most manufacturers require that any work done on the system—especially repairs involving electrical components or refrigerant—be completed by a licensed HVAC contractor. If the technician doesn’t follow manufacturer-approved procedures or uses substandard parts, it can lead to operational issues and automatic warranty termination. At D-N-D Services, our technicians are NATE certified, factory trained, and licensed by the state of Texas to work on all major brands, including Carrier, Trane, Lennox, Goodman, York, Bryant, and more, ensuring that any repairs we perform help protect your warranty.

2. Using Non-OEM Parts

OEM (Original Equipment Manufacturer) parts are components that meet the exact specifications of your AC system. If a technician uses off-brand or generic parts during a repair, even if they seem to “fit,” it may lead to improper operation and can void the warranty. Manufacturers typically specify that any replacement parts used must be OEM-approved. Our team at D-N-D Services uses authorized replacement parts and always follows brand-specific repair guidelines to maintain your system’s integrity and protect your warranty coverage.

3. Skipping Regular Maintenance

Another common mistake that leads to voided warranties is neglecting routine AC maintenance. Many manufacturers require annual or bi-annual servicing as part of their warranty agreement. If you can’t show proof of regular professional maintenance, your warranty claim could be denied—even for a covered issue. That’s why D-N-D Services offers comprehensive maintenance plans, including inspections, coil cleaning, refrigerant checks, and duct evaluations to ensure your system stays in top shape and your warranty stays valid.

4. Improper Installation or Modifications

Poor installation is a leading cause of early AC system failures and voided warranties. If your system was not installed by a qualified professional or has been altered in a way not approved by the manufacturer—such as adding incompatible components or modifying the ductwork—it can void the warranty. Our team specializes in correct installation and retrofits, especially in foam insulated homes, where airflow and system balance are more complex. We also provide Manual J load calculations to ensure your system is properly sized and installed from day one.

5. Failing to Register the Warranty

Believe it or not, simply failing to register your system after installation can void or reduce your warranty coverage. Many brands offer extended warranties only if the equipment is registered within 60–90 days of purchase. At D-N-D Services, we assist our customers in properly registering their systems and educating them on the full terms of their coverage.

6. DIY Repairs or Refrigerant Handling

In Texas and many other states, it’s illegal for unlicensed individuals to handle refrigerants. Attempting a DIY repair involving refrigerant leaks, charging, or compressor issues is not only dangerous—it immediately voids any manufacturer warranty. Our EPA-certified technicians ensure that refrigerant is handled safely, and according to legal and manufacturer guidelines.

Conclusion

Your HVAC system is a major part of your home or business—and so is the warranty that protects it. Choosing a trusted, licensed, and experienced service provider is the best way to make sure your warranty remains intact. At D-N-D Services, we’ve proudly served Rockwall, Garland, Greenville, Mesquite, Dallas, Plano, McKinney, Allen, and surrounding areas for decades, offering honest, high-quality repairs and maintenance that safeguard your comfort and your coverage. Whether it’s a quick repair, a scheduled maintenance check, or a full system replacement, you can count on D-N-D Services to do the job right the first time. Don’t risk voiding your warranty—call us today for expert service backed by experience, licensing, and a reputation you can trust.