Furnace Replacement Cost in 2026

Cost by project size

Cost by type

Using furnace replacement planning ranges before you sign equipment orders

Furnace replacement ranges are most useful when you treat them as installed-system planning bands, not equipment sticker prices. National guides often describe common gas furnace changeouts with standard efficiency tiers, venting updates, and basic thermostat connections. Your local bids set the real number: chimney liner requirements, condensing vent routing, electrical upgrades, duct modifications, and after-hours emergency replacement can shift the same BTU rating into another cost tier. Ask bidders to list model numbers, AFUE tier, venting approach, permit handling, haul-away, and startup commissioning on identical capacity assumptions. Compare proposals that separate optional air quality add-ons from the base heat plant. High-cost metros often run higher labor and permit costs for the same furnace SKU because wages and inspection logistics differ.

Efficiency tiers, sizing, and venting scenarios that change installed cost

Standard-efficiency replacements may reuse existing flues with modifications, while high-efficiency condensing units often need PVC venting and condensate management that add labor and materials. Oversizing furnaces remains a comfort and efficiency problem; ask for load-based sizing inputs beyond square footage alone. Propane, natural gas conversion, and oil-to-gas changes are different projects with fuel line and venting implications. When comparing scenarios, hold duct condition and thermostat type constant so price differences reflect furnace strategy. Planning midpoints assume typical basement or closet installs; cramped attic or rooftop mechanical rooms increase time. Local code and manufacturer requirements for clearance and combustion air should appear in writing before you authorize equipment orders.

Emergency no-heat replacements and winter scheduling pressure

Winter failures create urgency that can limit brand choice and compress comparison shopping. Temporary heat—space heaters, fireplaces used cautiously, or hotel stays—may buy time for three written bids if safety allows. Some contractors offer same-day changeouts for common sizes but may charge premium labor during cold snaps. Ask what happens if inspection fails or parts are back-ordered mid-install. High-cost metros often run higher emergency rates and longer queues when regional cold events hit. Planning ranges help you maintain a replacement reserve before failure; local availability sets whether you accept a good-enough immediate install or wait for preferred equipment.

Ductwork, airflow, and comfort issues to address during furnace changeout

A new furnace on leaky or undersized ducts may not deliver rated efficiency or even rooms. Ask for static pressure checks or basic airflow observations before assuming equipment alone fixes cold spots. Return-air upgrades, filter cabinet sizing, and zoning controls may be worth pricing while the system is open. Humidifiers and UV add-ons should be optional lines, not buried in a vague package. If your home has a heat pump or AC coil paired with the air handler, confirm compatibility plans for the cooling side. High-cost metros often run higher duct repair labor. Local comfort complaints should inform scope; national averages cannot see your basement return restriction or crushed flex runs.

Permits, combustion safety, and inspection checkpoints

Furnace replacements typically require mechanical permits and inspections focused on venting, gas piping, electrical disconnects, and condensate disposal. Carbon monoxide safety and proper slope on condensate lines are non-negotiable details. Confirm who pulls permits and whether inspection fees are included. If you are changing fuel type or venting class, additional review may apply. High-cost metros often run higher permit soft costs and stricter scheduling. Keep inspection finals, startup checklists, and warranty registration with equipment manuals. Local AHJ rules and utility fuel requirements set compliance steps; planning guides remind you to reject quotes silent on permits and combustion air.

Timeline from failure to commissioned heat

Straightforward like-for-like changeouts often complete in one day once equipment is on site, with older venting surprises sometimes extending into a second day. Lead times for popular high-efficiency models can add days or weeks before install. Permit approval may gate scheduling in some cities. Ask for a written outage window and how the home will be protected during work. Startup should include combustion analysis where applicable, thermostat programming, and filter guidance. High-cost metros often run longer permit and inspection queues. Planning calendars help household logistics; local crew and equipment availability set the real return-to-heat date.

What a complete furnace replacement bid should include

Comparable bids specify BTU output, AFUE, model numbers, venting materials and routes, gas line modifications, electrical scope, thermostat model, condensate plan, permit fees, old equipment disposal, warranty terms, and payment schedule. Optional IAQ products and duct repairs should be separable. Vague “new furnace installed” lines hide missing liner work or condensate pumps. Request startup and safety testing steps in writing. High-cost metros often run higher labor rates, but itemization exposes low quotes that omit flue adapters or required shutoff valves. Local bids set the payable total; national planning bands help you finance and spot outliers that skip essential venting or inspection steps.

Repair-versus-replace and pairing with central air or heat pumps

Heat exchanger concerns, repeated ignitor or inducer failures, and age beyond expected service life often push replacement ahead of another major repair. If a central AC coil shares the air handler, ask whether cooling compatibility and warranty support favor replacing both sides together. Heat pump conversions may change the role of the furnace to backup heat or eliminate it entirely—a different economic path than a gas furnace swap. Compare ten-year cost of repairs, efficiency loss, and safety risk against a replacement quote with warranty. Planning ranges for repair and replacement serve different decisions; local diagnostic findings and parts availability determine the practical fork.

Regional climate, fuel availability, and labor market notes

Cold climates emphasize capacity at design temperature and reliable backup heat when pairing with heat pumps. Propane markets see different fuel storage and piping costs than municipal natural gas. High-cost metros often run higher installed totals for identical furnaces because wages and parking constraints differ. Altitude and venting terminations may require manufacturer-approved configurations. You do not need fabricated city price tables—ask local HVAC contractors how your venting path and install location affect their installed price on a fixed AFUE tier, then compare those explanations across bids. Register warranties at startup and set calendar reminders for filter changes and annual combustion checks.

Post-install maintenance that protects furnace performance and warranty

A new furnace only delivers rated efficiency when filters are changed on schedule, vents remain unobstructed, and condensate lines stay clear on high-efficiency units. Ask the installer for recommended filter size, MERV range, and inspection intervals. Keep combustion air paths and closet doors configured as the manual specifies—blocking returns is a common post-install mistake after homeowners store items around the air handler. Listen for unusual noises in the first weeks and report them while warranty labor still applies. Planning ranges cover installation, not decades of maintenance, but skipped filter care can void heat exchanger warranties and shorten equipment life. Local service companies often offer affordable annual tune-ups that verify safety controls, flame quality, and vent integrity. Treat those visits as cheap insurance against mid-winter failures and carbon monoxide risks.

Labor cost

Labor typically covers removal, setting the new furnace, gas and electrical connections, venting, filter setup, and combustion testing. Tight mechanical rooms and attic installs take longer.

Additional costs

• Permit and inspection fees
• New thermostat or control wiring
• Humidifier or UV add-ons
• Duct transitions, returns, or filter-cabinet upgrades
• Condensate pump for high-efficiency units

Repair versus replacement

If a furnace is 15+ years old and needs a heat exchanger, inducer, or major control-board repair, replacement quotes usually win on risk and efficiency. Younger units with a single failed part may still justify repair.

Cost factors

• AFUE / efficiency tier

  Standard-efficiency units cost less up front; condensing 95%+ AFUE furnaces add equipment and often PVC venting work.

• Fuel type

  Natural gas furnaces dominate many markets. Propane conversions, electric furnaces, and dual-fuel setups change equipment and labor scope.

• Venting and combustion air

  Switching to a condensing furnace may require new vent routes, condensate drains, and combustion-air corrections.

• Blower and duct match

  Oversized or restrictive ducts, aging coils, and mismatched blowers can force extra parts or airflow work.

• Venting, chimney liner, and condensate system upgrades

  Switching efficiency class or routing new PVC venting and drains commonly adds materials and labor beyond a simple like-for-like swap.

• Duct repairs and return-air improvements

  Fixing crushed flex, adding returns, or sealing leaky ducts during furnace changeout improves performance but expands scope beyond equipment-only pricing.

Ways to save money

• Replace during shoulder seasons when crews have more availability.
• Keep the same fuel type and location when possible.
• Ask whether a matched coil is required for warranty on a shared system.
• Compare AFUE savings against the price jump for your climate and runtime.
• Get three bids with the same efficiency tier and scope.

Contractor quote checklist

• Exact model, BTU input, and AFUE listed
• Venting and condensate scope included
• Gas leak and combustion testing promised
• Parts and labor warranty lengths written
• Filter size and maintenance guidance provided

Related cost guides & articles

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• Heat Pump vs Furnace: Cost Factors to Compare

Next steps in this project cluster

• Category hub
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• Furnace Replacement calculator
• HVAC Replacement calculator
• Heat Pump Installation calculator
• Furnace Not Heating
• Furnace Repair vs Replacement
• Heat Pump vs Furnace
• HVAC Maintenance
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Frequently asked questions