Furnace Replacement Cost: What Affects the Price?
Last updated: September 2026
Replacing a furnace is one of those projects where a national average is only a starting point. The final price depends on the type of furnace, how much heating your house needs, the efficiency level you choose, and whether the installation requires venting, duct, gas-line, or electrical changes. This guide covers current planning ranges, what drives the price, and what to ask before you sign.
Quick Answer: How Much Does Furnace Replacement Cost?
- Many standard furnace replacements cost roughly $3,500 to $7,500 installed. Angi’s 2026 data puts the national average around $4,800.
- Natural gas furnaces commonly run about $3,800 to $12,000 installed, with high-efficiency (96%+ AFUE) models at roughly $7,500 to $12,000 (HomeGuide).
- Biggest cost drivers: fuel type, furnace size, efficiency (AFUE), venting, ductwork, installation difficulty, permits, and gas-line or electrical work.
- 2026 note: the federal 25C tax credit for high-efficiency furnaces ended after 2025. Utility rebates may still be available.
- These are national planning figures. Your home’s price can differ, so compare itemized estimates for the same scope of work.
What Does a New Furnace Usually Cost?
National cost guides show a wide range because “furnace replacement” can describe very different projects. HomeGuide reports about $3,500 to $7,500+ installed for many standard-efficiency replacements, with high-efficiency models reaching about $11,500. Angi reports a 2026 national average of about $4,814, with most projects between roughly $2,823 and $6,896.
Use these ranges to set a budget before you request estimates, not to decide what your project “should” cost before anyone has looked at your house.
Furnace Replacement Cost by Fuel Type
| Furnace Type | Typical Installed Cost | Good to Know |
|---|---|---|
| Electric | $2,500 – $7,000+ | Lower equipment cost; operating cost depends on local electric rates |
| Natural gas | $3,800 – $12,000 | The most common type; requires gas line and venting |
| Oil | $4,000 – $10,000+ | Common in parts of the Northeast; needs a fuel tank |
| Propane | $3,000 – $12,000+ | Used where natural gas isn’t available; needs a propane tank |
Source: HomeGuide national cost data. Fuel conversions, such as switching from oil to gas, add cost beyond these figures.
The Biggest Factors That Affect Furnace Replacement Cost
1. Furnace Type and Fuel Source
Equipment, venting, fuel connections, and installation requirements differ by fuel type, so prices vary a lot. If your estimate involves switching fuels rather than a like-for-like replacement, ask the contractor to separate the conversion work from the furnace price.
2. Furnace Size and Heating Load
A larger furnace generally costs more, but bigger isn’t automatically better. Equipment should be sized to the actual heating needs of your house, not square footage alone or the size of the old furnace. The Air Conditioning Contractors of America (ACCA) describes Manual J as the ANSI-recognized standard for residential load calculations, accounting for climate, insulation, windows, air leakage, and duct losses.
Ask: “How did you determine the furnace size you’re recommending?”
3. Efficiency Rating (AFUE)
Gas and oil furnace efficiency is measured by AFUE (Annual Fuel Utilization Efficiency). A higher AFUE means more of the fuel becomes usable heat. An 80% AFUE furnace turns about 80 cents of every fuel dollar into heat, while a 96% AFUE model turns about 96 cents into heat.
Higher-efficiency furnaces cost more upfront. Current pricing data puts 96%+ AFUE gas furnaces at roughly $7,500 to $12,000 installed before unusually complex changes. Don’t compare two quotes without comparing AFUE. An 80% furnace and a 96% furnace aren’t equivalent bids.
HomeGuide’s gas furnace data shows how both efficiency and size affect installed cost:
| Gas Furnace Efficiency | Typical Installed Cost |
|---|---|
| Standard (80% – 89% AFUE) | $3,800 – $6,200 |
| Mid-efficiency (90% – 95% AFUE) | $5,200 – $8,800 |
| High-efficiency (96%+ AFUE) | $7,500 – $12,000 |
| Approx. Home Size | Typical Furnace Size | Typical Installed Cost (Gas) |
|---|---|---|
| Up to 1,200 sq. ft. | 40,000 – 50,000 BTU | $3,800 – $6,700 |
| 1,200 – 1,600 sq. ft. | 50,000 – 60,000 BTU | $4,200 – $7,200 |
| 1,600 – 2,000 sq. ft. | 60,000 – 70,000 BTU | $4,700 – $8,000 |
| 2,000 – 2,500 sq. ft. | 70,000 – 90,000 BTU | $5,100 – $9,500 |
| 2,500 – 3,000+ sq. ft. | 90,000 – 120,000 BTU | $5,800 – $12,000 |
Source: HomeGuide gas furnace cost data. Home size is only a rough guide; the right furnace size should come from a load calculation.
4. Venting and Condensate Drainage
High-efficiency (condensing) gas furnaces often need different venting than older units, usually PVC pipe instead of a metal flue, and they produce water that must drain properly. If the new furnace can’t reuse the existing venting, cost goes up. Ask whether the proposal includes all venting, combustion-air, and condensate drainage work.
5. Ductwork and Airflow
A new furnace still relies on your ducts to deliver heat. If ducts are damaged, undersized, or poorly connected, the contractor may recommend changes. Not every replacement needs duct work, so ask what problem was found, whether the work is required for the new equipment, and how much of the price it accounts for.
6. Gas-Line, Electrical, and Controls
A replacement may need updates to gas piping, electrical connections, breakers, thermostats, or control wiring. These can add cost even on a straightforward swap, so the estimate should say clearly whether they’re included.
7. Access and Installation Difficulty
A furnace in an open utility room is easier to replace than one in a tight attic, crawlspace, or closet. Cramped spaces, platform changes, or venting reroutes add labor.
Comparing Furnace Quotes?
Our free Before You Hire Home Repair Cost Checklist helps you line up estimates side by side, spot missing line items, and ask the right questions before you sign.
Why Two Furnace Quotes Can Be Thousands of Dollars Apart
A lower quote isn’t necessarily incomplete, and a higher quote isn’t necessarily better, but they may cover different equipment and work. One estimate may be a standard-efficiency furnace reusing most of the existing setup. Another may include a high-efficiency model, new venting, a thermostat upgrade, duct changes, permits, and disposal of the old unit.
A useful furnace estimate should list:
- Furnace brand, model, and heating capacity (BTUs)
- Fuel type and AFUE rating
- Labor for removal and installation
- Any venting, condensate, gas-line, or electrical work
- Thermostat and duct changes
- Permits, inspections, and disposal of the old furnace
- Manufacturer and labor warranty details
If one proposal is much cheaper, find the missing difference before assuming you’ve found a bargain.
Should You Replace the AC at the Same Time?
If your central air conditioner shares the furnace’s indoor blower and ductwork, some homeowners replace both together, especially when both are aging. It can simplify matching equipment and may save on combined labor. HomeGuide puts a combined furnace-and-AC replacement at roughly $10,500 to $18,500. If your AC is still relatively young and healthy, replacing only the furnace can make more sense. For AC pricing, see our guide to AC replacement cost.
Should You Repair the Furnace or Replace It?
A replacement quote often comes right after a breakdown or an expensive repair estimate. Age alone rarely decides it. ENERGY STAR suggests considering replacement when a furnace is more than about 15 years old, especially if it needs frequent repairs, energy bills are rising, or rooms aren’t staying comfortable.
Carrier cites a common guideline: when a major repair approaches about half the cost of a new furnace, replacement deserves a closer look. That’s a guideline, not a rule. A modest repair on a furnace in good condition can still make sense. Replacement is easier to justify when the furnace is older, repairs are frequent, a major part has failed, or the technician finds a safety or combustion problem.
Safety note: If a technician mentions a cracked heat exchanger or another combustion
problem, ask them to show and explain the finding, and follow their safety guidance. Make sure you have working
carbon monoxide detectors. If a CO alarm sounds, leave the house and call 911 or your gas utility from
outside.
Tax Credits and Rebates in 2026
The federal Energy Efficient Home Improvement Credit (Section 25C), which helped with qualifying high-efficiency furnaces, ended for equipment placed in service after December 31, 2025. If you’re replacing a furnace in 2026, don’t count on that credit.
Many gas and electric utilities and some state programs still offer rebates for high-efficiency equipment. Check your utility’s website or the ENERGY STAR rebate finder, and ask your contractor which rebates the proposed furnace qualifies for. Get that in writing.
What About the 95% Furnace Efficiency Rule?
You may hear that federal furnace rules are changing. In 2023, the U.S. Department of Energy finalized a standard that would require most new residential gas furnaces to reach 95% AFUE, with compliance set for late 2028. The rule has been challenged in court. In June 2026, the Supreme Court sent the case back to a federal appeals court for reconsideration, and DOE has proposed delaying implementation while litigation continues.
For homeowners, the practical takeaway is simple: the rule does not require a 95% furnace today. Both standard and high-efficiency gas furnaces can still be installed in 2026. Ask your contractor what efficiency level they’re proposing, why it fits your home, and what installation changes a higher-efficiency model would require. Because the rule’s future is uncertain, base your decision on your home’s needs and your budget, not on predictions about the rule.
Questions to Ask Before Replacing a Furnace
- What exactly is included in this price?
- What furnace model, capacity, and AFUE rating are you proposing?
- How did you determine the heating capacity I need?
- Does the installation need new venting or condensate drainage?
- Will any gas-line or electrical work be required?
- Does the duct system need changes? If so, why?
- Are permits, inspections, and removal of the old furnace included?
- What manufacturer and labor warranties apply?
- Does this furnace qualify for any utility or state rebates?
- What could change the final price after work begins?
- If my current furnace can be repaired, how does that compare with replacing it?
Furnace Replacement: Frequently Asked Questions
How long does a furnace last?
Angi puts the average furnace lifespan at about 20 years, and many last longer with regular maintenance. ENERGY STAR suggests evaluating replacement once a furnace is about 15 years old, especially if it needs frequent repairs.
How long does furnace replacement take?
A straightforward like-for-like replacement is often done in a day. Fuel conversions, new venting, or duct changes can take longer.
Is a high-efficiency furnace worth it?
It depends on your climate, fuel prices, and how long you plan to stay. In colder areas with long heating seasons, the fuel savings from a high-efficiency furnace add up faster. Ask your contractor to estimate the difference in annual operating cost.
What size furnace do I need?
There’s no reliable square-footage shortcut. The right size depends on your climate, insulation, windows, and air leakage, and should come from a load calculation such as ACCA Manual J.
Is there a tax credit for a new furnace in 2026?
The federal 25C credit ended for equipment placed in service after December 31, 2025. Utility and state rebates may still be available in your area.
The Bottom Line on Furnace Replacement Cost
For planning, roughly $3,500 to $7,500+ is a useful range for many standard furnace replacements. Natural gas systems commonly land around $3,800 to $12,000, and high-efficiency models or complicated installations can reach about $12,000 or more.
The final price depends on much more than the furnace itself. Fuel type, heating capacity, efficiency, venting, ducts, gas or electrical work, permits, and access all change the project. Before approving a replacement, make sure you understand what equipment is being installed, how it was sized, what the estimate includes, and why any extra work is needed.
Get the Free Before You Hire Checklist
Download our free Before You Hire Home Repair Cost Checklist. Use it to compare furnace quotes, catch missing line items, and decide with confidence.
Sources
- Angi: How Much Does a New Furnace Cost? (2026 Data)
- HomeGuide: How Much Does a New Furnace Cost?
- HomeGuide: How Much Does a Gas Furnace Cost?
- Carrier: Furnace Repair vs. Replacement
- ENERGY STAR: When Is It Time to Replace?
- ENERGY STAR: Furnace Tax Credits
- ACCA: Manual J Residential Load Calculation
- ACHR News: 95% Furnace Efficiency Rule to Get New Hearing (2026)
House Care
Compass provides general educational information to help homeowners better understand repair and replacement decisions.
Cost figures are national planning estimates and will vary by location, home, and contractor. For advice about your
specific home or project, consult an appropriately qualified professional.