Replacing a gas furnace costs $3,800 to $12,000 installed in 2026, with most homeowners landing between $4,500 and $7,500 for a mid-efficiency unit in a typical single-family home. That range is wider than it was two years ago — and the reasons for that matter before you start calling contractors.
Two things have changed since most cost guides were last updated. First, new furnace and HVAC system prices are running 10–15% higher than 2023–2024 prices, driven by the A2L refrigerant equipment mandate that took effect January 1, 2025. Second, the federal Section 25C tax credit that used to save homeowners up to $600 on gas furnaces expired on December 31, 2025. A lot of contractor websites and cost aggregators still show that $600 figure. It no longer applies to 2026 installations.
Here's what you're actually looking at.
Furnace Replacement Cost by Type
The biggest variable isn't the brand — it's the fuel source and efficiency rating.
| Furnace Type | Equipment Only | Installed Cost | AFUE Range |
|---|---|---|---|
| Gas furnace (standard) | $700 – $1,800 | $3,800 – $6,500 | 80–89% |
| Gas furnace (high-efficiency) | $2,800 – $6,200 | $7,500 – $12,000 | 96–98% |
| Oil furnace | $1,200 – $3,500 | $6,000 – $12,500 | 80–90% |
| Electric furnace | $400 – $1,800 | $1,500 – $6,500 | 100% |
| Air-source heat pump (as replacement) | $2,500 – $6,000 | $4,000 – $10,000+ | N/A (200–400% efficiency) |
Gas Furnace
Gas is what most homes in the U.S. run, and the installed cost range is genuinely wide because efficiency rating is the main price lever. An 80% AFUE (Annual Fuel Utilization Efficiency) gas furnace converts 80 cents of every dollar of gas into heat and vents the rest. A 96–98% AFUE unit loses only 3–4 cents on the dollar — but the equipment itself costs $1,000 to $2,500 more upfront.
Standard-efficiency models ($3,800–$6,500 installed) use a single-stage burner, a basic heat exchanger, and a Category III flue — which can often reuse your existing vent pipe. High-efficiency models ($7,500–$12,000 installed) use condensing technology, a secondary heat exchanger that extracts heat from exhaust gases, and PVC drain pipes for the condensate they produce. If your home was built with a B-vent flue, upgrading to high-efficiency adds a PVC flue installation to the project cost.
The efficiency math: if you currently spend $1,500 per year on heating gas, switching from an 80% to a 96% unit saves roughly $240–$260 annually. At a $1,500 premium for the high-efficiency unit, that's a 5–6 year payback — faster if gas prices rise.
Oil Furnace
Oil furnaces run $6,000 to $12,500 installed. The higher cost relative to gas reflects a more complex fuel delivery system (burner, nozzle, fuel pump, oil filter) and the labor involved in maintaining it. Many oil furnace replacements also involve deciding whether to stay on oil or convert to another fuel source — a conversion to gas can cost $3,000 to $8,000 on top of the furnace itself, but long-term fuel savings often justify it in areas with natural gas access.
If you're on oil and your furnace is over 15 years old, this is worth modeling out with a local contractor rather than defaulting to like-for-like replacement.
Electric Furnace
Electric furnaces are the least expensive to buy and install: $1,500 to $6,500 fully installed. The equipment itself is simple — resistance heating elements, a blower, and controls — which keeps labor and equipment costs down. No venting required.
The tradeoff is operating cost. Electric resistance heating is expensive to run in most of the country. At $0.16/kWh (the 2026 national residential average), an electric furnace costs significantly more per BTU of heat than natural gas. For homes without gas access, a heat pump is almost always the better long-term choice over an electric furnace.
Heat Pump as a Furnace Alternative
If you're replacing an electric furnace or your home doesn't have natural gas, a heat pump deserves serious consideration. Modern cold-climate heat pumps operate efficiently down to -15°F or lower — a performance ceiling that didn't exist five years ago.
Air-source heat pumps run $4,000 to $10,000+ installed depending on the system size, configuration, and whether you need supplemental heat. They move heat rather than generate it, which is why they can deliver 2–4 units of heat per unit of electricity consumed. The result: dramatically lower operating costs versus electric resistance.
See our heat pump vs. furnace comparison for a full breakdown of when each makes more financial sense.
What Drives Your Quote Up or Down
Once you understand the base ranges, the next question is where your project is likely to land within them.
Efficiency Rating (AFUE)
Already covered above, but worth repeating: the gap between an 80% AFUE quote and a 96% AFUE quote on the same installation can easily be $2,500 to $4,000. That's the single biggest variable inside any contractor's quote.
Home Size and BTU Load
Furnaces are sized in BTUs per hour. A 2,000 sq ft home in a cold climate typically needs 60,000–80,000 BTUs. An oversized furnace short-cycles — it heats up fast, shuts off, heats up fast, shuts off — which wastes fuel and stresses the equipment. An undersized furnace runs continuously on the coldest days. A contractor who doesn't do a Manual J heat load calculation before sizing is guessing, and you'll pay for that guess in efficiency and comfort.
Ductwork Condition
Leaky or undersized ducts can add $500 to $3,000 to a furnace project, sometimes more. If your existing ductwork has never been inspected or sealed, factor this into your planning. A contractor who looks at your furnace but doesn't examine the duct system isn't giving you an accurate picture.
Labor Market in Your Region
Labor rates for furnace installation vary substantially by geography. The national average for furnace installation labor runs $1,000 to $2,000 for a standard swap. In California, New York, and the Pacific Northwest, labor alone can run $1,500 to $3,000. In the Midwest and Southeast, the same work often costs $800 to $1,400.
Permits and Code Compliance
Most jurisdictions require a permit for furnace replacement. Permit costs run $50 to $400 depending on your municipality. Some contractors include permits; some don't. Ask before you sign.
Access and Installation Complexity
A furnace in a utility closet with tight clearances takes longer than one in an accessible basement. If your existing unit is in an attic, expect a labor premium of $200 to $500 over a straightforward installation.
Why 2026 Prices Are Higher Than What You've Read Elsewhere
Starting January 1, 2025, EPA regulations prohibited the manufacture of new residential HVAC equipment using high-GWP refrigerants — primarily R-410A. New systems must use A2L refrigerants like R-454B (used in heat pump coils and air handlers that pair with furnaces) or R-32. A2L refrigerants are mildly flammable, which requires equipment redesigns: thicker-walled components, refrigerant detection systems (RDS) on certain units, and updated installation practices.
The result: new equipment costs 10–15% more than comparable pre-mandate equipment. By 2026, the warehouse inventory of cheaper pre-mandate units has been depleted. What you're getting a quote on today is compliant A2L equipment at the new price baseline.
This also affects hybrid and dual-fuel systems — a popular pairing of a gas furnace with a heat pump air handler — since the heat pump side of those systems uses A2L refrigerants.
The Tax Credit You've Probably Read About — and Why It's Gone
If you've been researching furnace replacement costs, you've likely seen references to a $600 federal tax credit for gas furnaces or a $2,000 credit for heat pumps. Those credits existed under Section 25C of the IRS code, and they were meaningful.
They expired December 31, 2025.
The One Big Beautiful Bill Act, signed July 4, 2025, did not extend the Inflation Reduction Act's Section 25C credits. Equipment placed in service — meaning fully installed and operational — on or after January 1, 2026 does not qualify. The trigger is the installation date, not when you signed a contract or paid a deposit.
If a contractor or comparison website is still showing these credits as available for your 2026 project, that information is wrong.
What's Actually Available in 2026
The IRA's $8.8 billion in home energy rebates — administered through the HOMES and HEAR (Home Electrification and Appliance Rebates, also called HEEHRA) programs — are funded separately from the tax credits and are still active. States administer these programs individually, which means availability, income eligibility, and rebate amounts vary significantly by location.
Where HEAR programs are active, income-qualifying households can receive:
- Up to $8,000 toward a heat pump system for households at or below 80% of Area Median Income (AMI)
- Up to $4,000 (50% of project cost) for households between 80% and 150% AMI
- States with stacked programs — New York, Maryland, Wisconsin, Colorado, Washington, Rhode Island, and North Carolina among them — can reach $10,000+ for income-qualifying households
Critical caveat: Not all states have launched HEAR programs, and some, like California, have already exhausted their allocations and are operating waitlists. Before assuming you qualify, check your state's energy office directly or see our HVAC rebates 2026 guide for current program status by state.
Utility rebates are the most universally accessible incentive in 2026. Many utilities offer $100 to $600 for high-efficiency gas furnace installations (95%+ AFUE) and $300 to $1,000 for heat pump installations. These don't require income qualification. Check with your utility before your installation — most require pre-approval or require the contractor to submit the rebate on your behalf.
Repair vs. Replace: A Decision Framework
Before you commit to a replacement, it's worth being deliberate about whether a repair actually makes more sense. Three rules of thumb that work together:
The Age Rule
Gas furnaces last 15 to 20 years under normal conditions. Under 10 years old: repair almost anything. Between 10 and 15 years: evaluate case-by-case. Over 15 years with a major component failure: replacement is usually the right call.
The 50% Rule
If the cost of a repair exceeds 50% of the replacement cost, replace. A heat exchanger replacement on a 16-year-old furnace costs $1,500 to $4,000. If your quote is $2,000 to fix a unit that would cost $5,000 to replace — and the existing furnace is running at 80% AFUE — you're making a significant investment in a system that's already cost-depreciated and running inefficiently.
The 5,000 Rule
Multiply the furnace's age (in years) by the repair quote (in dollars). If the result exceeds 5,000, replace. If it's under 5,000, repairing is usually the better short-term financial path.
Example: A 14-year-old furnace needs a $400 ignitor replacement. 14 × 400 = 5,600. By the rule, you're borderline — but a $400 repair on a working furnace with 5+ years of life left is probably still the right call. Contrast that with a $900 control board repair on the same furnace: 14 × 900 = 12,600. Clear replacement signal.
These rules are frameworks, not formulas. If your furnace is 17 years old, running at 80% AFUE, and needs a $1,200 repair, no calculation is really necessary. That's a replacement.
One more factor: if your furnace has had multiple repairs in the last two years, the frequency of breakdowns is telling you something. A single expensive repair is one thing. A pattern of failures on aging equipment is another.
If you're not sure whether a repair quote is reasonable, our HVAC repair cost guide breaks down what specific repairs should actually cost, so you know whether a quote is in range before you authorize the work.
Getting Quotes
Get at least three quotes from licensed contractors. Not because you should automatically pick the lowest — because the quotes will tell you things. A quote that's 40% lower than the others is usually missing something: a different equipment tier, a permit the contractor expects you to pull, or a contractor without proper licensing.
Ask each contractor:
- What brand and model number are you quoting, and what's the AFUE rating?
- Does the quote include permit fees?
- Are you pulling the permit or am I?
- Does the quote include ductwork inspection and sealing?
- What's the labor warranty, and what's the equipment warranty?
Most equipment carries a 5- to 10-year parts warranty from the manufacturer. Labor warranties from contractors typically run 1 to 2 years. Both matter.
If you're in an area where multiple companies are actively bidding HVAC work, finding HVAC technicians in your area lets you post your project details and get responses from local licensed contractors — useful if you're in a market where cold-calling companies is slow.
Frequently Asked Questions
How much does furnace replacement cost in 2026?
A gas furnace replacement costs $3,800 to $12,000 fully installed in 2026. Most homeowners in typical single-family homes spend $4,500 to $7,500 for a standard-efficiency gas unit. High-efficiency models (96%+ AFUE) run $7,500 to $12,000. Prices are 10–15% higher than 2023–2024 baselines due to the A2L refrigerant equipment mandate.
Is there still a federal tax credit for furnace replacement in 2026?
No. The Section 25C federal tax credit — which provided up to $600 for high-efficiency gas furnaces — expired on December 31, 2025. Equipment installed in 2026 is not eligible. IRA-funded state rebate programs (HEAR/HEEHRA) are still active in many states for heat pump installations, with rebates up to $8,000 for income-qualifying households.
What AFUE rating should I buy?
In cold climates (Zones 5–7), a 96%+ AFUE furnace typically pays back the premium in 5–8 years in gas savings. In mild climates or regions with low gas prices, an 80–89% AFUE unit may never fully pay back the efficiency premium. Ask your contractor to run the numbers for your specific heating load and local gas rates.
How long does furnace installation take?
A standard like-for-like furnace swap takes 4 to 8 hours for most installations. Switching fuel types (oil to gas), adding a new flue for a high-efficiency unit, or replacing ductwork adds time and cost. Most contractors can complete a standard replacement in a single day.
What size furnace do I need?
Sizing is based on your home's heat load, not square footage alone. A proper Manual J calculation accounts for insulation levels, window area, ceiling height, climate zone, and air sealing. A rule of thumb for an average-insulated home in a cold climate is roughly 35–40 BTUs per square foot, but that's a starting point, not a specification.
Should I replace my furnace before it breaks?
If your furnace is over 15 years old and running at 80% AFUE, replacing it proactively — ideally before the heating season — is often the smarter financial move. You avoid an emergency replacement (which limits your ability to shop quotes), you choose the timing, and you capture any available rebates for a planned installation rather than an emergency one.
What happens if I don't pull a permit for furnace replacement?
Unpermitted work can create problems when you sell your home, may void your equipment warranty, and in some jurisdictions carries fines. More practically: a permit triggers an inspection, and the inspection verifies the installation is safe. Gas appliances where the work was never inspected are a meaningful safety risk.
What's the difference between a furnace and an air handler?
A furnace burns fuel to generate heat. An air handler is the indoor unit in a heat pump system — it distributes conditioned air using a blower and coil, but doesn't generate heat itself. If someone quotes you an "air handler" when you asked about a furnace, make sure you understand which type of heating system they're proposing.