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AfterHow Much Does Furnace Replacement Cost in Lewisville?
Furnace replacement in Lewisville typically runs from about $3,800 to $7,900 installed, and most homes land in the $4,500 to $6,500 range. The final number depends on system size, efficiency rating, and whether ducts or venting need work. Every estimate we provide is free, and the written estimate sets the final price.
We know that’s a wide spread, and it’s meant to be. A straight swap of a standard 80% furnace in a single-story Lewisville ranch home sits near the bottom of that range. A high-efficiency two-stage system with a new flue and duct repairs in an older two-story pushes toward the top. The breakdown below shows where the money goes.
Furnace Replacement Cost Breakdown (2026)
Here’s what each part of a typical replacement job costs in the Lewisville market. These are estimated ranges, not quotes. Your written estimate is the number that counts.
| Line Item | Typical Estimated Range |
|---|---|
| Standard 80% efficiency furnace (unit only) | $1,400 – $3,200 |
| High-efficiency 90%+ condensing furnace (unit only) | $2,600 – $4,800 |
| Labor and installation | $1,200 – $2,200 |
| Flue or venting modifications | $250 – $900 |
| Ductwork repair or resizing | $300 – $1,400 |
| Thermostat replacement | $120 – $450 |
| Permit and inspection | $80 – $250 |
| Total installed (typical) | $3,800 – $7,900 |
What pushes a job up: high-efficiency condensing units cost more up front but can burn less gas over time. Converting from an 80% furnace to a 90%+ model often requires new PVC venting, which adds a few hundred dollars and sometimes a bit of carpentry. What pulls a job down: a straight changeout in a home where the existing flue, ducts, and electrical all check out. That’s the best-case scenario, and it does happen in Lewisville homes built in the last twenty years.
What Affects Furnace Replacement Pricing in Lewisville
- System size and home square footage. A furnace is sized to the home’s heat load, not to what’s on sale. A 1,400-square-foot Lewisville house needs a smaller unit than a 3,000-square-foot home with vaulted ceilings, and the unit price difference between those two is real money.
- Efficiency rating. The jump from a standard 80% furnace to a 90%+ condensing model adds roughly $1,000 to $1,600 to the equipment line. It’s worth weighing against your gas bill and how long you plan to stay in the house.
- Venting and flue condition. This is where older Lewisville neighborhoods surprise people. Homes built in the 1970s and 1980s sometimes have vent runs that worked fine for an older furnace but don’t meet current requirements for a new one. That’s an added cost, and it’s also a safety issue.
- Duct condition. North Texas homes run a lot of attic ductwork, and attic heat is hard on it. If the ducts leak or are undersized for the new system, fixing them now costs less than pulling the system apart later.
- Electrical and gas connections. A modern high-efficiency furnace may need a dedicated circuit or a condensate drain line where the old unit didn’t have one. Small items, but they add up.
- Access and removal. A furnace in a closet, attic, or tight mechanical room takes longer to remove and install than an open basement setup. Labor reflects that. (Texas homes rarely have basements, so most Lewisville jobs are closet or attic installs.)
How to Save on Furnace Replacement
The cheapest way to lower a furnace replacement bill in Lewisville is to not need one yet. A furnace that gets a tune-up before the first cold snap often runs several more seasons. Our furnace repair service has its own cost range, and one repair call is far cheaper than a new system. Weather in North Texas is mild most of the year, but that first hard cold front around late November or December is when furnaces fail, usually on a Sunday.
When replacement truly is the answer, a few things help:
- Get a real heat-load calculation, not a rule of thumb. Some contractors size a furnace by square footage alone and end up installing a unit that’s too big. An oversized furnace short-cycles, wastes gas, and wears out faster. A proper sizing job costs nothing extra and saves money over the life of the system.
- Fix the ducts before the furnace goes in. Sealing and balancing ductwork during a replacement costs less than doing it as a separate job later, and it lets the new furnace perform the way it’s rated to.
- Ask about the difference between 80% and 90%+ before you decide. In a mild climate, the efficiency premium doesn’t always pay back as fast as a salesperson suggests. We’ll run the math with you and let you choose.
- Get the estimate in writing and free. Call (844) 761-3596 and we’ll come out, measure, and give you a written number. No fee, no pressure, and the written estimate is the final price.
One more thing we believe: replacement should be the last option, not the first. We’re set up to repair, not to sell. If your furnace can be fixed, that’s the recommendation you’ll get. When it’s genuinely at the end of its life, you’ll hear that too, in plain terms.
Can You Replace a Furnace the Same Day in Lewisville?
Most furnace replacements in Lewisville take one full day, and yes, we can often start same-day when the schedule allows. A standard changeout in a home with good access and compatible venting usually wraps up in six to eight hours. High-efficiency conversions that need new PVC venting or duct repairs can stretch to a day and a half.
The critical question is the cold snap. When the first hard front rolls through in late November or December, furnace calls pile up fast. If your furnace quits on a Saturday, call (844) 761-3596. We answer 24/7, and a call outside dispatch hours is booked into the next opening, Sunday through Friday, 7am to 7pm.
Same-day service doesn’t mean a rush job on safety. Gas connections, venting, and combustion checks get the same attention either way. If we can’t do it right that day, we’ll tell you so and book the soonest slot that lets us finish the job properly.
Repair or Replace: Which Makes Sense for Your Furnace?
Repair first, replace when the math stops working. That’s been our default approach across every furnace we’ve worked on, and it hasn’t changed. Our technicians have up to experience and have seen plenty of furnaces that were talked into an early retirement by someone who would rather sell a unit than fix it.
Here’s how to think about it. Furnace repair in Lewisville typically runs $150 – $700. If your furnace is repairable and the fix is in that range, repairing is almost always the smarter move. If the heat exchanger is cracked, the repair is often not viable, and replacement becomes the safe answer. If the unit is old, failing repeatedly, and the repair bills keep stacking up, it’s time to weigh a new system honestly.
We work on the brand you already have. Rutherford technicians are familiar with the nine most widely installed residential brands on the market: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. That means we’re not guessing at an unfamiliar system when we diagnose it. If your furnace is one of those brands, we know what we’re looking at. If it isn’t, we’ll tell you that upfront instead of pretending.
Furnace Replacement vs. AC Replacement: What to Know in Lewisville
Furnace replacement in Lewisville generally lands in the $3,800 – $7,900 range, while AC installation typically runs $3,500 – $7,500. Many homeowners end up replacing both systems at once, especially in homes where the furnace and air handler share a closet or the ducts are on the same circuit. Doing both at the same time usually saves on the second set of labor and permit costs.
We handle furnace repair, AC repair, and AC installation under one company name. If your furnace is the problem, we start there. If it’s the AC, we’ll tell you. Because both seasons run through the same team, you won’t need to call a different number in January than you called in July. Want the full picture for your home? Call (844) 761-3596.
Why Get a Written Estimate Before You Commit
A verbal ballpark is not a price. Before you sign, get a written estimate that lists the unit model, the efficiency rating, the installation labor, and any venting or ductwork. That’s the number you can hold someone to, and it’s the number we put on paper.
Our estimates are free, and the written estimate sets the final price. We don’t quote a low number to get in the door and find surprises in the attic. We look at the actual job, then quote it. If it’s a straight changeout, you’ll see a straight changeout number. If the venting needs to change or the ducts need work, that’s on the estimate, labeled clearly, so you can decide whether the extra scope is worth it.
If you’re comparing estimates from other companies, ask what each one includes and what it leaves out. A lower line on paper often means a line item you’ll pay for later.
What to Check on Your Current Furnace Before You Replace It
Before you call anyone for a replacement quote, take five minutes to look at the equipment itself. The data plate on the furnace gives you the model number and the manufacture date. Write both down. If the unit is a brand we service, that speeds up diagnosis. If the unit is old enough that parts are hard to find, that’s a real factor in whether repair is even possible.
Look at the flue. Is it a metal pipe or a white PVC? A metal flue usually means an 80% furnace; PVC means a 90%+ condensing model. That matters, because replacing an 80% with another 80% is a simpler job than switching to 90%+ with new PVC venting. Either is possible in a Lewisville home, but the costs are not the same.
Check the filter. A clogged filter causes overheat shutdowns that can look like a dead furnace. Sometimes the fix is a filter and a reset, not a unit. That’s a call worth making before you assume you need a new furnace.
Gas furnace work is not a place for DIY. Gas connections, combustion, and venting can cause carbon monoxide problems if handled wrong. A trained professional should check the heat exchanger and the gas valve every time. We’ll do that as part of any replacement estimate, and we’ll flag anything unsafe we see on the existing unit.
Furnace Replacement Costs for Common Lewisville Home Types
Homes in Lewisville come in a range of sizes and ages, and the furnace cost tends to track both. Here’s how it shakes out in general terms:
- Single-story homes under 1,800 square feet. Usually the lower end of the range, often $3,800 – $5,200 for a standard 80% changeout. Straightforward access, smaller unit, less vent work.
- Two-story homes from 1,800 to 2,500 square feet. Typically $4,500 – $6,500, depending on efficiency and whether the existing venting needs updates.
- Larger homes over 2,500 square feet with two systems. Two-furnace homes land closer to the top of the range, often $6,000 – $7,900, because there’s more equipment and more labor.
- Older homes with original ductwork. Duct repairs can add $300 – $1,400, especially in homes where the original install was undersized or the attic runs have aged badly in North Texas heat.
These aren’t quotes. They’re the ranges we see in this market, and your home may land elsewhere. The free estimate is the way to know.
FAQs – Furnace Replacement Cost
How much does furnace replacement cost in Lewisville?
Furnace replacement in Lewisville typically costs $3,800 – $7,900 installed, with most homes landing in the $4,500 – $6,500 range. Efficiency rating, system size, and venting work are the biggest variables. Call (844) 761-3596 for a free estimate.
Is it cheaper to repair or replace a furnace?
Repair is cheaper when the fix falls within the $150 – $700 furnace repair range and the unit has life left in it. Replacement is the right call when the heat exchanger is cracked, the furnace is failing repeatedly, or repairs stop making financial sense. We start with repair and move to replacement only when the facts point that way. Call (844) 761-3596 to get a straight answer.
How long does a furnace replacement take in Lewisville?
A standard furnace replacement in Lewisville usually takes six to eight hours and can often start the same day. High-efficiency conversions with new venting may take a day and a half. Call (844) 761-3596 to check availability.
Can you work on my brand of furnace?
Yes, most likely. We service nine of the most widely installed residential brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. That covers most of the furnaces sitting in Lewisville homes. If yours is a different brand, call (844) 761-3596 and we’ll tell you straight whether it’s a fit.
Does a new furnace save money on gas bills?
It can, but the savings depend on what you’re replacing and how long you stay in the home. A 90%+ condensing furnace uses less gas than a standard 80% model. We’ll run the numbers with you before you decide, because the premium doesn’t always pay back on a short timeline. Call (844) 761-3596 for a free estimate and a straight conversation.
Get a Free Furnace Replacement Estimate in Lewisville
If your furnace is on its last legs, you need a real number, not a range off a page. We’ll come out, look at the unit, check the venting and ducts, and put a written estimate in your hands. Free. No pressure. If repair makes more sense, we’ll tell you. And if it’s a brand we work on, we’ll know the system before we touch it.
Rutherford AC Repair handles three things well: AC repair, AC installation, and furnace repair. That focus is deliberate. When you need heating and cooling help in Lewisville, you’re calling one company, not juggling vendors. Call (844) 761-3596. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
Pricing reflects the Lewisville market as of 2026. Rutherford AC Repair offers free estimates – call (844) 761-3596.
Written by the team at Rutherford AC Repair.
What Our Customers Say
"AC died in August, which in this city is an emergency. He found a blown capacitor, replaced it, and had cold air blowing in under 40 minutes. Charged me about what I'd expect to pay for the part plus a service call."
- Javier Guzman"Blower motor on a 12 year old furnace. He gave me the honest math on repair versus replace and did not push me toward the bigger ticket. We repaired it and it's been fine."
- Hector Morales"Thermostat had been miswired by whoever installed it, which is why the heat strips were running with the AC. He found it in a few minutes and probably saved me a fortune on the next few electric bills."
- Ernesto Torres