Calculator

Furnace Replacement Cost Calculator

Estimate what a furnace replacement should cost by output, efficiency and venting work.

Model reviewed August 2026

Price it for my market

Select a state to re-price the estimate with local labor and material costs.

Heating output

Cost per 1,000 BTU installed($)

Efficiency

Venting changes

Old furnace removal

Permit fee($)

Estimated installed cost

$4,677 – $6,644

Furnace and labor: $4,800
Venting work: $0
Removal and permit: $515

Estimates only. Local pricing, site conditions and code requirements change the real number.

Price this job in your state

This page uses the national average. Pick your state for the same tool re-priced with local labor, material and permit-fee indexes.

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The formula

Cost = base unit cost x efficiency multiplier + venting + removal + permit

High-efficiency condensing furnaces (90%+ AFUE) need new PVC venting and a condensate drain, which is why the jump from 80% to 96% AFUE costs more than the equipment difference alone.

Worked example

An 80,000 BTU 96% AFUE gas furnace with new venting typically runs $5,200 to $7,600 installed.

Frequently asked questions

How much is a new furnace installed?

Most homeowners pay $4,000 to $8,500 for a replacement gas furnace in 2026. Electric furnaces are cheaper to install but cost far more to run.

How long does a furnace last?

15 to 20 years for a gas furnace with annual service. Past year 15, repairs over about $1,500 usually favor replacement.

Sources

Sources & verification

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.