Furnace Replacement Cost Calculator (2026)
By Dan Whitlock, Home Projects Editor · Updated July 2026
A furnace replacement is priced mostly by fuel type, efficiency rating, and how much the installer has to change to fit the new unit. In 2026, most homeowners pay $2,800 to $7,500 installed for a standard gas furnace, and the average job lands near $4,800. A high-efficiency condensing furnace, a larger home that needs more BTUs, or duct modifications push the number toward the top of that range. Build your estimate below, then read what moves the price.
Estimate your cost
Equipment plus a standard professional install. AFUE is the efficiency rating.
Labor and materials swing with local cost of living.
Estimated furnace replacement cost
$2,925 – $5,650
Most homeowners pay around $4,150
Cost breakdown
- Gas — standard 80% AFUE$3,900
- Permit, thermostat & old-unit haul-away$250
Planning estimate based on 2026 national price data — not a quote. Get local quotes to confirm.
Free, no obligation. We may earn a commission if you request quotes — it never changes your price.
What drives your furnace replacement cost
- Fuel type: electric furnaces install cheapest, gas sits in the middle, and oil furnaces run the highest to replace.
- Efficiency (AFUE): a high-efficiency 90–96% condensing furnace costs more up front but cuts fuel bills; an 80% unit is cheaper to buy.
- Home size and BTU: a larger home needs more heating capacity, and each step up in BTU adds equipment cost.
- Ductwork: reusing sound existing ducts keeps cost down, while duct repairs run about $5–$45 per linear foot and full replacement $1,400–$6,000.
- Add-ons: a new or extended gas line ($500–$2,000), permits ($50–$1,500), and a smart thermostat ($150–$400) each add to the total.
Ready for real numbers?
A calculator gets you the fair range. Local quotes confirm it for your exact home. Comparing 2–3 pros is the single best way to avoid overpaying on a furnace replacement.
Free, no obligation. We may earn a commission if you request quotes — it never changes your price.
Ways to save
- Get 2–3 quotes — install labor on the same furnace can vary by hundreds of dollars.
- Size the unit with a proper load calculation instead of oversizing "to be safe."
- Weigh an 80% AFUE furnace against a 96% model — the payback on high-efficiency depends on your climate and how long you’ll stay.
- Replace in the spring or fall shoulder season when HVAC crews are less booked.
- Bundle the permit, thermostat, and haul-away into one quote rather than paying for each separately.
Helpful products
Doing part of this yourself? These are the product categories most people buy for this job. As an Amazon Associate we may earn from qualifying purchases — it never changes your price.
Frequently asked questions
How much does furnace replacement cost in 2026?
Most homeowners pay $2,800 to $7,500 installed, with an average near $4,800. A standard 80% gas furnace runs less, while a high-efficiency gas, oil, or larger unit with duct work pushes toward the top of the range.
Is a high-efficiency furnace worth the extra cost?
A 90–96% AFUE condensing furnace costs roughly $4,000–$10,000 installed versus about $2,800–$5,200 for an 80% model, but it burns less fuel every winter. It pays back fastest in cold climates and homes you plan to keep for years.
Why is furnace installation so expensive?
The furnace itself is only part of the total. The rest is labor, venting, gas or electrical connections, permits, and disposal — and a fuel-type conversion or new ductwork can add thousands on top of the base unit.
How long does a furnace last?
A gas furnace typically lasts 15–20 years and an electric furnace 20–30. If yours is past 15 years and needing repairs, replacing it on your schedule avoids the premium of an emergency mid-winter swap.
Sources
Price ranges cross-referenced against these 2026 cost guides and contractor databases:
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