Furnace Replacement Cost Guide
Updated 2026-07-08
What actually decides the price
Think of furnace pricing as a base number that gets multiplied up or down. Start with a standard 80% AFUE gas furnace going into an average home with ductwork that does not need touching, and you are looking at roughly $3,500 to $5,500 installed. From there, four things push that number around: swapping to electric pulls it down, moving to a 90%-plus AFUE unit or an oil furnace pushes it up, a bigger house needs a bigger (and pricier) unit, and any ductwork modification adds real labor on top. Stack enough of those together and a job that started in the mid-$3,000s can land north of $8,000. This page breaks each of those factors down individually; the calculator combines them into one number for your specific situation, ZIP code included.
Why two quotes for the same job can differ by a lot
Contractors do not price off a shared rate card. Their own overhead, crew training, and how busy their schedule is that month all feed into the number they hand you, and it is common to see the same job quoted $500 to $1,500 apart by two reputable companies. That spread is exactly why getting more than one quote matters more here than it does for most home purchases: the low bid is not automatically the bad one, and the high bid is not automatically padded, but you cannot tell which is which from a single data point.
Furnace replacement cost by scenario
| Setup | What homeowners actually pay |
| Gas furnace (installed) | $3,000 - $6,000 |
| High-efficiency gas | $4,500 - $8,000 |
| Electric furnace | $2,000 - $4,500 |
| Oil furnace | $4,000 - $7,500 |
| With ductwork changes | $5,000 - $10,000 |
The variables in plain terms
- Fuel type. Gas dominates new installs; oil and electric each carry their own cost and operating-cost tradeoffs.
- Efficiency rating. A higher AFUE number costs more to buy and less to run every month after.
- Square footage. More space means a higher-BTU furnace, which costs more before labor even enters the picture.
- Ductwork condition. Reusing what is already there keeps cost down; modifying or replacing it does not.
- Labor and permitting. Licensed installation and any required permit are part of every legitimate quote.
- Regional rates. Where you live changes contractor labor cost more than almost any other factor here.
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Questions homeowners ask before buying
What determines the price of a furnace replacement?
Four things move the number the most: the fuel you pick, the efficiency rating, how big the home is, and whether the ductwork can stay as-is. Labor rates in your area shift it further on top of those.
Does upgrading to high efficiency pay for itself?
Usually, if you live somewhere with real winters. The extra 400 to 1,200 dollars for a 96 percent AFUE unit tends to come back through lower gas bills and available rebates within four to eight heating seasons.
How many years should a furnace last before I plan to replace it?
Plan around 15 to 20 years for a gas furnace with normal maintenance, longer for electric units. Start budgeting once yours passes 15, since that is roughly when repair costs start competing with replacement cost.
How do I know what size furnace my house needs?
Square footage is only the starting point. Climate zone and how well the home is insulated matter just as much, which is why a licensed contractor runs a Manual J load calculation instead of sizing off square footage alone.
Is it worth replacing the AC at the same time as the furnace?
If both units are already old, yes. One combined labor visit typically runs 1,000 to 2,500 dollars less than two separate service calls, and the contractor can match the two systems properly from the start.
What would a furnace cost for a 2,000 square foot home?
Expect 2,500 to 5,500 dollars installed for a typical 2,000 square foot house, before ZIP-code adjustment. Brand, AFUE rating, and whether the ducts need work all push that range up or down.
My furnace is 30 years old. Should I just keep repairing it?
Probably not. A furnace that old is well past its expected service life and is very likely running 60 to 70 percent AFUE, wasting a third or more of every heating dollar compared to a modern unit, on top of a rising risk of a cracked heat exchanger.
What should labor alone cost on a furnace install?
Somewhere between 800 and 2,000 dollars in 2026 for a straightforward swap. Anything involving new gas lines, new venting, or electrical panel work will land above that range, so ask contractors to break out labor from equipment on the quote.
Want a number specific to your home? Run the calculator with your ZIP code for an estimate adjusted to your local market.