FURNACE INSTALLATION & REPLACEMENT  LEWISVILLE, TX

A new furnace installation in Lewisville and the North DFW area typically costs between $3,200 and $12,000 installed, depending on the system you choose and your home’s requirements. Entry-level 80% AFUE systems start around $3,200–$5,700, while mid-range 90–95% AFUE models usually fall between $4,100–$7,500. High-efficiency systems 96%+ range from $5,500–$10,000, and premium modulating furnaces can reach $7,500–$12,000. The final price depends mainly on the efficiency tier, the size of your home, and whether any ductwork or venting changes are needed. Permits from the City of Lewisville can also affect pricing. Every project we complete is different, which is why we recommend contacting us for an in-home consultation and a written estimate. It's free to do and we'll never pressure you into a sale.

We're able to complete most of our residential furnace replacements in Lewisville in 6–8 hours, so the job is done in just one visit. But if we need to modify your ductwork or carry out venting conversions (80% AFUE to condensing 90%+), or if you're after a full system replacement with AC installation, this can take 1–2 days.

Yes, the City of Lewisville requires a mechanical permit for every furnace installation and replacement, including like-for-like replacements. When you choose Koala-T to install your furnace, we'll submit the permit through MGO Connect on your behalf, and arrange for the work to be inspected at rough-in and final stages.

DFW falls in IECC Climate Zone 3A, which requires roughly 40–45 BTU of heating output per square foot. The size of the furnace you need depends on your home size, but as an example, a 2,000 sq ft home will typically need an 80,000–90,000 BTU furnace to keep warm during North Texas winters. But square footage is only the starting point! A proper Manual J load calculation should also factor in things like insulation, window area, ductwork, and air infiltration. We run a Manual J on every installation to size your system correctly and guarantee efficient operation without unnecessarily high heating bills.

The difference between 80% AFUE and 95% AFUE furnaces comes down to efficiency. An 80% AFUE furnace converts 80% of the gas it burns into usable heat (20% is lost through the flue). A 95% AFUE condensing furnace captures almost all of that heat, using PVC venting instead of metal B-vent, and produces liquid condensate that drains away. High-efficiency furnaces cost more upfront but use significantly less gas over their lifespan. In Lewisville’s mild climate, it takes longer to see savings, but you're likely to still benefit—especially with new efficiency standards coming in December 2028.

Yes, we offer 0% financing options on qualifying Amana furnace installations, subject to credit approval. Terms are typically available from 12 to 60 months. Contact us directly for current financing offers and a soft-credit payment estimate, and we'll walk you through your options during your free in-home estimate.

Yes, you may want to consider replacing your furnace before December 2028. As of December 18, 2028, federal efficiency standards will require all new residential furnaces to meet 95% AFUE, and non-condensing 80% AFUE furnaces will no longer be manufactured. If you replace your furnace before the 2028 deadline, you can still choose a lower-cost 80% AFUE system or keep your current venting setup. After that, only higher-efficiency condensing furnaces will be available.

Yes, Koala-T Heating & Air holds Texas HVAC license TACLA00153892E. That's a Class A Environmental Air Conditioning license, the highest tier for residential and commercial HVAC work. We're insured and bonded to $1 million through Hartford Insurance, and all our technicians are TDLR-licensed, background-checked, and drug-tested.