Replace installed (high efficiency)up to US$11,500
Typical lifespan15 - 25 years
HomeGuide new furnace cost data, 2026, US dollars. InterNACHI life expectancy chart.
Replacement cost by home size
1,000 - 1,500 sq ftUS$2,000 - 4,500
1,500 - 2,500 sq ftUS$3,000 - 6,500
2,500 - 3,500 sq ftUS$4,000 - 9,500
3,500+ sq ftUS$5,500 - 10,000+
When people lean repair
The furnace is under 15 years old and the heat exchanger is sound.
The quote is small relative to a new unit, which runs into the thousands.
When people lean replace
A cracked heat exchanger is a carbon monoxide risk. A licensed pro confirms it, and it means replacement rather than repair.
It is past 18 to 20 years and needs a major part like a blower motor or control board.
Bills keep climbing and the unit is an old low-efficiency model.
Warranty angle
Warranty contracts can cap what they reimburse for a heating system. If a contract cap is below the full replacement cost, the difference stays with you.
Costs: HomeGuide installer-reported data, 2026. Lifespans: InterNACHI home life expectancy chart. All prices in US dollars.