Furnace Replacement Cost: A Complete 2026 Guide

By Andrea · August 2026

Most homeowners replacing a gas furnace spend somewhere between $2,500 and $7,500 all-in — equipment plus installation labor. That range moves a lot depending on fuel type, efficiency rating, home size, and whether your ductwork needs work. This guide breaks down every major cost driver so you can walk into contractor quotes with realistic numbers. All figures are 2026 estimates only; actual costs vary by region, furnace brand, and site conditions. Get at least three quotes from licensed local HVAC contractors and ask each one for a Manual J load calculation.

What Moves the Price the Most

Five variables account for most of the spread between a low quote and a high one.

• Fuel type: Natural gas is the most common and usually the least expensive to operate. Propane runs higher on operating cost. Electric furnaces carry the lowest equipment price but can cost more annually depending on local electricity rates. Oil furnace replacement cost and Mobile Home Furnace Replacement Cost each follow their own pricing logic — see those guides for details.
• AFUE efficiency tier: An 80% AFUE single-stage unit is the entry-level option; 96–98% two-stage or modulating equipment costs more upfront but qualifies for utility rebates and federal tax credits. The Furnace Replacement Cost Calculator lets you model how AFUE tier shifts your all-in estimate.
• Home size and BTU output: A proper Manual J load calculation from your HVAC contractor tells you the right BTU rating — oversized units short-cycle and undersized units underperform on cold days. Fuel-switching scenarios (e.g., oil to gas) affect sizing too; see the Oil Furnace Replacement Cost guide for how that changes the math.
• Ductwork condition: Existing ducts in good shape add nothing to the project; significant repairs or a full new-duct run can add substantially. The Furnace Replacement Cost Calculator includes a ductwork input so you can factor this into your estimate.
• Region and labor rates: HVAC labor in the Northeast and West Coast runs noticeably higher than the Midwest or South. The same equipment installed by comparable contractors can differ by several hundred dollars between markets.

Rough Cost Ranges by Fuel Type and Efficiency

These are broad all-in estimates — equipment plus standard installation labor — not quotes. Actual costs depend on your specific home, ductwork, region, and the brands your contractor carries.

• 80% AFUE gas furnace (entry-level, smaller home): lower end of the installed-price range; common for straightforward swaps in mild climates
• 96% AFUE two-stage gas furnace (mid-range, 1,500–2,500 sq ft): the most common upgrade path; qualifies for many utility rebates. If you're also replacing the AC, see the furnace and AC replacement cost guide for how combined project pricing works.
• 98% AFUE modulating furnace (high-efficiency, larger home): premium equipment cost with highest rebate eligibility; makes sense in climates with long, cold winters
• Electric furnace replacement typically runs less upfront than gas, but a panel upgrade — required if your service is already at capacity — can close that gap quickly.

Want a number specific to your home before you call anyone? The Furnace Replacement Cost Calculator takes fuel type, AFUE tier, square footage, and region as inputs and gives you a ballpark estimate in minutes.

Repair vs. Replace: When the Math Favors a New Furnace

A useful rule of thumb: if a single repair quote exceeds half the installed cost of a comparable new unit and your furnace is over 15 years old, replacement usually wins on total cost of ownership. Age matters because furnaces approaching 20 years tend to stack failures — one repair leads to another within a season or two.

A cracked heat exchanger almost always tips the decision toward replacement — it's a carbon monoxide safety issue, not just a cost question. See the Heat Exchanger Furnace Replacement Cost guide for how to verify the crack is confirmed before authorizing a full swap.

Smaller component failures — a Blower Motor, an Ignitor, or a Flame Sensor — almost always favor repair when the furnace is under 15 years old and no other major issues are present.

Common Repair Costs Worth Knowing

Before committing to replacement, it helps to know what individual repairs actually cost. Pricier repairs like a Control Board, Gas Valve, or Inducer Motor can push you toward replacement math faster than a simple ignitor swap. Each guide covers typical cost ranges, what drives the price up or down, and when the repair makes sense versus when replacement wins.

Replacing Furnace and AC Together

If your central air conditioner is also aging, replacing both systems at the same time often reduces total labor cost — the HVAC contractor is already on-site with the furnace disconnected. Combined replacements can also qualify for matched-system efficiency rebates that single-unit swaps don't. The furnace and AC replacement cost guide breaks down how combined project pricing works and what rebates are worth asking about.

Special Cases: Mobile Homes and Oil Systems

Standard furnace pricing doesn't translate directly to manufactured housing. Mobile home furnace replacement requires HUD-certified equipment, which costs more per BTU than standard units, and belly-wrap ductwork under older homes often needs inspection or repair as part of the job. Hire a contractor with documented manufactured-housing experience.

Oil-heated homes face a separate decision: replace with another oil unit or switch fuels. Staying with oil is cheaper short-term; switching to gas means running a new gas line and often removing the tank, which adds substantially to the project. Oil furnace replacement covers both paths and the factors that determine which makes financial sense in your situation.

Safety — Non-Negotiable Regardless of Cost

Furnace installation and repair involves gas lines, combustion systems, and high-voltage electrical — this is licensed-contractor work in all cases. Install a working carbon monoxide detector near the furnace before any combustion system goes back into service. Manufactured-housing installs carry additional code requirements; the Mobile Home Furnace Replacement Cost guide covers what differs.

Before scheduling any repair or replacement, check whether your furnace is still within its parts warranty — most manufacturers cover components for 5–10 years, which can eliminate part costs on repairs that would otherwise push you toward replacement. For component-specific warranty guidance, see the Furnace Flame Sensor Replacement Cost and Furnace Gas Valve Replacement Cost guides.

Next Steps

Start with the Furnace Replacement Cost Calculator to get a ballpark estimate before you call contractors. Then get at least three quotes from licensed local HVAC contractors, ask each for a Manual J load calculation in writing, and confirm that every quote includes haul-away of the old unit, permit fees, and a post-install combustion test.

Estimate your furnace replacement cost with our free 2026 calculator →