Furnace Replacement Cost

Furnace replacement cost includes more than the price of a new heating unit. Your proposal should also explain installation, removal and any changes to the existing setup. Therefore, compare the completed project before deciding which equipment offers the best value.

Furnace Replacement Cost by Fuel Type

The following installed ranges come from HomeGuide’s fuel-type table. They are broad published estimates, rather than bids collected by HomeFixLedger.

Source: HomeGuide’s furnace replacement cost guide, dated December 31, 2025; reviewed here in September 2026. A plus sign indicates that some projects exceed the listed range.

These categories are not interchangeable bids. For example, a proposal to retain your existing fuel setup describes a different project from a conversion.

What Should a Furnace Replacement Quote Include?

Request an itemized proposal before paying a deposit. Next, use this checklist to identify gaps that could make the final bill harder to predict.

• Equipment: Manufacturer, model number, fuel type and heating capacity.
• Removal: Disconnecting, moving and disposing of the old furnace.
• Connections: The included fuel, electrical and thermostat work.
• Air distribution: Any proposed changes to ducts, transitions or returns.
• Venting and drainage: The components required for the selected model.
• Project administration: Responsibility for applicable permits and inspections.
• Startup: Testing, operating instructions and completion records.
• Warranty: Written parts and labor terms, including exclusions.

Separate required work from optional additions

Ask the contractor to price accessories individually. This lets you evaluate each addition without losing sight of the basic replacement scope.

Also, clarify whether any line is an allowance. If the final amount depends on conditions found during removal, request the approval process for additional charges.

How Efficiency Affects Furnace Replacement Cost

AFUE stands for Annual Fuel Utilization Efficiency. It expresses useful heat output as a percentage of energy input over a heating season. However, a higher rating alone does not establish your future utility savings.

The U.S. Department of Energy evaluates efficiency upgrades by comparing their additional purchase cost with energy savings over time. Consequently, request a savings estimate based on your fuel prices and expected heating use.

Ask what the efficiency upgrade changes

Condensing furnaces recover heat from exhaust gases. Their installation can require changes to the existing setup. Before choosing one, ask the installer to describe the proposed venting and drainage arrangements.

Then compare the complete installed upgrade price, including those changes. This is more useful than comparing the furnace cabinets alone.

Do not choose capacity by habit

DOE also identifies oversizing and poorly designed distribution systems as causes of reduced performance. Therefore, ask the contractor to explain the recommended capacity rather than simply repeating the old unit’s rating.

Technical reference: U.S. Department of Energy furnace purchasing and installation guidance.

Replacing a Furnace Versus Changing Fuel Types

If you are considering a different fuel, request two separate proposals. One should cover replacement within your current setup; the other should describe the complete conversion.

For the conversion, ask each contractor to identify work outside the furnace installation. Include any separate trade estimates in your comparison.

Questions to resolve before choosing

• Which existing components become unnecessary?
• Who handles their removal or decommissioning?
• What supply connections must change?
• Does the project require work outside the mechanical room?
• Who coordinates the different contractors?

Finally, request operating-cost assumptions for both options. A lower installation price does not, by itself, tell you which proposal fits your household budget over time.

Should You Repair or Replace the Existing Furnace?

Start with a written diagnosis. Ask what failed, what the repair includes and whether the technician identified other concerns.

Next, compare a specific repair proposal with a specific replacement proposal. Avoid making the decision from an unexplained percentage rule or an equipment age alone.

Organize the decision around your situation

• Record previous repairs and recurring problems.
• Ask whether the proposed repair addresses the diagnosed fault completely.
• Check any remaining warranty coverage directly against its terms.
• Explain comfort problems you want the project to address.
• Request separate explanations for safety findings and optional upgrades.

If the technician identifies an unsafe operating condition, follow their shutdown instructions. Resolve that concern before treating the decision as a routine price comparison.

How to Compare Furnace Replacement Cost Quotes

Give each bidder the same description of your home and goals. Then compare equipment specifications, construction scope and warranty terms together.

For example, one proposal might include a duct modification while another retains the existing arrangement. Ask both contractors to explain the difference before judging the totals.

Should you replace the AC at the same time?

Request a furnace-only price and a combined price. Also, ask the contractor to explain equipment compatibility and which work would be shared between the projects.

For the cooling portion, use our AC replacement cost guide. If your home is receiving central air for the first time, see central air installation cost instead.

Frequently Asked Questions