Gas furnaces in DFW typically last 18–22 years with regular maintenance. Because we only use our heat 400–600 hours per year (compared to 1,500–2,000 in northern markets), our furnaces theoretically should last longer. But in practice, they often don't, usually because of short-cycling during mild winters and attic heat exposure reaching 130°F+, as well as corrosion caused by long idle periods.

Whether you should repair or replace your furnace depends on factors including its age, how much it'll cost to repair, and whether the failure could affect its operational safety. If your furnace is under 8 years old, we'll usually recommend repairing it. But if it's 12 to 18 years old, we'll usually only suggest repairs if they're under $500, and for units over 18 years, we'll advise you to start shopping. Not only will a new system help you avoid paying out of pocket for costly repairs, but it'll also boast better energy efficiency — something that can make a big difference if you currently have high energy bills due to inefficient HVAC performance.

Most furnace repairs in Lewisville run between $150 and $800, with the majority of no-heat calls landing in the $200–$400 range (flame sensor replacement, igniter replacement, capacitor, or programmable thermostat). Bigger repairs like blower motors, gas valves, and control boards run from $400 to $2,000. Our diagnostic fee is $89, credited toward the repair if you approve the work. We'll always provide a written estimate with exact pricing before we get started.

Yes, our standard furnace diagnostic fee is $89 during business hours (this is standard with most HVAC installation and repair companies in the area). If you approve the repair, the $89 is credited toward the job, so you don't pay it twice. Our emergency and after-hours diagnostics are priced higher due to response costs, and we'll always tell you the exact fee before we dispatch a technician. Joey Club™ members get their diagnostic fees waived.

Yes, Koala-T Heating & Air holds Texas HVAC license TACLA00153892E. We're a registered Texas LLC, insured and bonded up to $1 million through Hartford Insurance. As a trusted heating and cooling company, all our technicians are background-checked, drug-tested, and licensed through the Texas Department of Licensing and Regulation (TDLR). Gas work requires extra safety training, which every Koala-fied Technician™ completes and maintains.

We service and repair all major furnace brands, including Amana, Trane, Lennox, Carrier, Rheem, American Standard, Goodman, Bryant, York, Heil, and more. As a Certified Amana Advantage Specialist, we have direct manufacturer support and access to exclusive Amana warranties and parts pricing. That said, we're happy to repair whatever furnace you own, regardless of brand.

Yes, we offer financing options for repairing furnaces and other HVAC systems in Lewisville. For repairs under about $1,000, most of our customers just pay at the time of service. But when we're making larger repairs and full replacements, we offer financing, including 0% options with approved credit on qualifying equipment. Contact us directly to learn what's currently available for your project. Tip: ask about federal Energy Efficient Home Improvement tax credits (up to $600 for qualifying gas furnaces), Atmos Energy rebates for high-efficiency gas equipment, and Oncor rebates for qualifying heat pump upgrades.