❄️ HVAC

Furnace Repair & Replacement — Lifespan & When to Replace

A Spokane furnace runs October through April, hard. At 15–25 years, maintenance history determines whether you get the full lifespan or fall short.

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What's Covered

  • ✓ 80% AFUE: 15–18 year lifespan
  • ✓ 95%+ AFUE two-stage: 18–22 years with maintenance
  • ✓ Cracked heat exchanger = CO risk — do not operate
  • ✓ Annual tune-up adds 3–5 years to expected lifespan
  • ✓ Avista efficiency rebates for qualifying equipment

Typical Costs in Spokane

80% AFUE gas furnace$2,500 – $4,500 installed
95%+ two-stage gas furnace$4,000 – $7,000 installed
96%+ modulating furnace$5,500 – $9,000 installed
Avista rebate (qualifying)Up to $500

Common Questions

What does a cracked heat exchanger mean?
Combustion gases — including CO — can enter your living space. Never operate a furnace with a confirmed cracked heat exchanger. Ask the tech to show you the crack with a borescope — any reputable contractor will.
Repair or replace?
If repair cost exceeds 50% of replacement cost and the furnace is 15+ years old, replace. A new 95%+ unit saves 15–25% on heating costs annually vs an older 80% unit.
Does Avista offer furnace rebates?
Yes — for qualifying 95%+ AFUE equipment in WA service territory. Rebate amounts change; confirm with Avista or ask your contractor at time of install.

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