How much does it cost to replace a furnace in 2026?
Interactive estimate from published 2026 national cost data, adjusted by state.
No email, no phone number — just the range you should expect before talking to contractors.
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Planning estimate (gas furnace, installed) — actual quotes vary with site conditions. Get 3+ written quotes.
What drives the cost
Fuel type: electric is ~half the install cost of gas but costs more to run in most climates
AFUE efficiency — 96%+ units add ~30% upfront, save $200–$400/yr
BTU sizing for your square footage and climate
Venting changes required for high-efficiency condensing units
Repair or replace?
Igniters, flame sensors and blower motors are repairable ($150–$800). A cracked heat exchanger is the replace signal — it's the most expensive part and a carbon monoxide risk. Furnaces past 15–20 years rarely justify major repairs.
Frequently asked questions
How much does it cost to replace a furnace in 2026?
Nationally, expect roughly $4,000–$8,500 at mid-range quality (gas furnace, installed). High-cost states run 15–35% above these numbers and low-cost states 5–15% below — use the calculator above to adjust for your state, project size and quality tier.
Should I repair or replace my furnace?
Igniters, flame sensors and blower motors are repairable ($150–$800). A cracked heat exchanger is the replace signal — it's the most expensive part and a carbon monoxide risk. Furnaces past 15–20 years rarely justify major repairs.
What drives furnace replacement cost up or down?
Fuel type: electric is ~half the install cost of gas but costs more to run in most climates; AFUE efficiency — 96%+ units add ~30% upfront, save $200–$400/yr; BTU sizing for your square footage and climate; Venting changes required for high-efficiency condensing units.
Methodology & sources
National range cross-checked against multiple published 2026 cost guides (Angi, HomeGuide, Homewyse, This Old House, Fixr and trade publications) in July 2026.
State adjustment uses an editorial labor-cost index (0.85–1.35 vs national average) — a simplification of real regional variation.
Quality tiers apply published multipliers for material/type differences (Electric furnace / Standard gas (80% AFUE) / High-efficiency gas (96%+ AFUE)).
Ranges exclude financing, unusual site conditions, and code-upgrade surprises.