Furnace replacement cost typically runs between $3,800 and $10,000 installed, according to national cost-guide data, with most homeowners landing in the $4,800 to $7,000 range for a mid-efficiency gas system. That’s the honest starting point. Where you actually land on that scale depends on the fuel type, the size of your home, and the efficiency of the system you choose.
One thing has changed since last year, too: the federal tax credit that used to shave a few hundred dollars off that price is gone for 2026, which matters if you’re weighing repair against replacement right now.
What actually determines furnace replacement cost
Four things move the number more than anything else: fuel type, efficiency rating, home size, and labor.
Gas, electric, oil, and propane furnaces all price differently, both to buy and to run. Efficiency, measured by AFUE (Annual Fuel Utilization Efficiency, essentially how much of the fuel actually turns into heat instead of escaping up the flue), adds cost upfront but saves money every winter after. A standard 80% AFUE furnace costs less than a 96%+ high-efficiency model, sometimes by a wide margin.
Home size matters because furnaces are sized in BTUs, and an undersized or oversized unit either can’t keep up or short-cycles itself into an early breakdown. A qualified installer calculates this based on square footage, insulation, window count, and ceiling height. Square footage alone isn’t enough.
Labor is the piece most homeowners underestimate. It’s a meaningful share of the total bill even on a straightforward swap, and it grows fast if the job needs ductwork changes, electrical work, or a tricky install location.
How Long should a furnace last?
Most gas furnaces last 15 to 20 years with regular maintenance, based on manufacturer and trade-group estimates. Electric furnaces often run a few years longer, since they have no combustion parts to wear out.
What shortens that window: skipped annual maintenance, a furnace that was undersized or oversized at install, and years of heavy use without a break. What extends it: a properly sized system from the start, a clean burner and flame sensor every year, and catching small issues, a failing igniter, a dirty filter, before they force bigger repairs.
None of that means every furnace over 15 years old needs to go. Plenty run fine into their 20s if they’ve been maintained well. Age is one signal, not a deadline.
Signs it’s time to replace your furnace
Age alone isn’t the trigger. These are the signs worth acting on:
- Heating bills have crept up without any real change in how you use the thermostat.
- Repair estimates are creeping toward half of what a new system would cost, the 50% rule most contractors use to decide.
- The heat exchanger is cracked, which is a carbon monoxide risk, not just a comfort issue.
- Some rooms run warm while others stay cold, even with the thermostat set the same.
- The system bangs, rattles, or squeals on startup or shutdown.
- It’s cycling on and off more than it used to, chasing a temperature it can’t hold.
Any one of these on its own might just mean a repair. Two or three together, especially on an older unit, usually means it’s time to stop patching it. If you’re not sure which category you’re in, a straightforward furnace repair diagnosis will usually tell you within the visit, and a system that’s been through consistent annual furnace maintenance tends to show these signs later than one that hasn’t.
Gas vs. Electric furnace pricing
Gas and electric furnaces solve the same problem in different ways, and the price difference reflects that.
Gas furnaces cost more to install, generally $3,800 to $10,000 depending on efficiency and size, but natural gas is usually the cheaper fuel to run month to month. That’s why gas remains the default choice for most homes with a gas line already in place. The U.S. Energy Information Administration reports that natural gas heats roughly half of American homes, and that share is higher in colder regions of the country.
Electric furnaces are installed for less, typically $2,000 to $7,000, and skip the venting and gas-line work entirely. Where they lose ground is in operating costs. Electric heat generally runs more expensive per BTU than gas in most parts of the country, so a lower sticker price can turn into a higher bill after a few winters.
Here’s how the two compare directly:
| Furnace type | Typical installed cost | Cost to run | Best fit |
| Gas | $3,800–$10,000 | Generally, the lowest per-BTU fuel cost in most regions | Homes with an existing gas line |
| Electric | $2,000–$7,000 | Runs higher per BTU than gas in most parts of the country | Homes without gas access, or smaller heating loads |
In short, gas wins on operating cost for most homes, while electric wins on upfront price for smaller or gas-free properties.
If you’re currently on oil and thinking about replacement anyway, it’s worth looking at an oil to gas conversion instead of a like-for-like swap. Oil furnaces cost more to install too, typically $6,750 to $10,000, on top of fuel costs that tend to run higher and less predictable than gas over time.
What’s actually included in an installed price
A quote that just says furnace: $X is missing the parts that actually add up. A completely installed price covers:
- The furnace itself, priced by efficiency tier and size.
- Labor for removing the old unit and installing the new one.
- Removal and disposal of the old furnace, typically $50 to $200 on its own.
- Permit fees, often required by local building codes for a furnace swap, typically $50 to $200.
- Any ductwork or electrical modifications the new system needs.
- A compatible thermostat, if the existing one doesn’t match the new system.
Ask any contractor giving you a number to break it down this way. If they won’t, that’s worth noting on its own.
Furnace tax credits and rebates in 2026: What’s actually still available
Here’s the part that’s changed since last year: the federal tax credit that used to apply to furnace replacements is no longer available.
Section 25C of the federal tax code, the Energy Efficient Home Improvement Credit, offered up to $600 toward a qualifying high-efficiency furnace. Congress ended that credit for any equipment placed in service after December 31, 2025, under the One Big Beautiful Bill Act.
If you install a furnace in 2026, that federal credit no longer applies, regardless of how efficient the unit is. A few HVAC websites haven’t caught up to this yet, so it’s worth double-checking wherever you still see the old $600 figure.
Utility and state rebate programs are a separate story, and they change more often than federal tax law does. Many utilities have run rebate programs for high-efficiency gas equipment in the past, though availability and terms shift from year to year and vary by provider. Rather than rely on a number that might already be outdated, check directly with your utility or a local contractor for current program status before assuming a rebate applies.
With the federal credit gone, financing has become the more practical lever for most homeowners managing the upfront cost. Most contractors offer financing options for qualified buyers, worth asking about when you request a quote.
Alternatives to furnaces
A furnace isn’t the only option, and for some homes it’s not the best one anymore.
Dual fuel systems pair a heat pump with a gas furnace as backup, running on the heat pump in milder weather and switching to gas once temperatures drop low enough that a heat pump alone can’t keep up efficiently. See our dual fuel heating system options if lower operating costs most of the year, without giving up reliable heat during a stretch of extreme cold, sounds like the right trade.
A ductless mini split works well for additions, older homes without existing ductwork, or anyone who wants zone-by-zone control instead of heating the whole house to one setting. It installs faster than a furnace-and-duct retrofit and skips the ductwork cost entirely.
Neither replaces a furnace in every situation. A drafty older home with no insulation plan in place is still usually better served by a properly sized furnace. The right call depends on the house, not a blanket rule, which is exactly what a home energy assessment is built to figure out before you commit to either direction.
How to tell if a furnace quote is fair
A fair quote starts with a load calculation for the specific home, not a guess based on square footage alone. That number determines the right size furnace, which matters more than almost anything else in the price. An oversized unit costs more upfront and wastes energy. An undersized one runs constantly and still can’t keep up.
A few questions separate a solid quote from a rushed one. What efficiency tier and brand is actually being installed, not just a furnace? What’s covered under warranty, and for how long? Is there anything that could add to the price once work starts? A contractor who answers these clearly, in writing, before any work begins is doing it right.
We build every quote this way, starting with a proper load calculation and installing Trane furnaces exclusively across the Standard and Premier lines, backed by a Lifetime Craftsmanship Warranty and 2-Year Labor Warranty. No red tape, no charges that show up after the fact that weren’t in the original quote.
Frequently asked questions
Is it cheaper to repair or replace an old furnace?
Repair is usually cheaper short-term for a furnace under 10 years old with a single issue. Once repair estimates approach half the cost of a new system, or the furnace is past 15 years old, replacement typically makes more financial sense.
How long does furnace installation take?
A standard furnace replacement typically takes 4 to 8 hours for a straightforward swap. Jobs that need ductwork changes, electrical work, or a difficult install location can take a full day or longer.
Do I need a permit to replace a furnace?
Yes, in most areas. Local building codes generally require a mechanical permit for furnace replacement, and a licensed contractor should handle the filing as part of the job rather than leaving it to the homeowner.
What size furnace do I need for my home?
Furnace size depends on square footage, insulation, ceiling height, and window count, not square footage on its own. A proper load calculation, not a rule of thumb, is the only reliable way to size it correctly.
Is financing available for furnace replacement?
Yes, most HVAC contractors offer financing options for qualified buyers, which can make the upfront cost easier to manage. Ask about current terms and rates when you request a quote.
A furnace replacement is a real investment, and the number on a quote should make sense once you know what’s behind it. If you’re weighing repair against replacement, or just want an accurate number for your specific home, the fastest way to get one is an in-home visit, not a guess over the phone.
