How Long Does a Furnace Last?

Source: InterNACHI Life Expectancy Chart
15-25 years
Estimated lifespan
15 years
Minimum
25 years
Maximum

Estimated Replacement Cost

$4,000 – $10,000
installed | National average, 2025-2026

Extend Its Life

Replace filters every 1-3 months. Schedule annual professional inspection. Keep vents unobstructed. Check thermostat calibration. Listen for unusual sounds.

Category: HVAC

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Lifespan estimates are based on industry data for typical residential installations with normal use and proper maintenance. Actual lifespan varies with installation quality, climate, usage intensity, and maintenance. These figures may differ from other sources.

Source: InterNACHI Standard Estimated Life Expectancy Chart for Homes

Page generated: 2026-03-29