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DECISION ANSWER · HIGH RISK

Should I repair or replace a 15-year-old furnace?

Age matters, but safety, repair history, efficiency, comfort, and the cost of the current failure matter more.

Written by Homara Editorial TeamReviewed 2026-08-03Updated 2026-08-03
THE SHORT ANSWER

A 15-year-old furnace is not automatically due for replacement. Repair can make sense for a safe, isolated, reasonably priced failure; replacement becomes more compelling when there is a heat-exchanger or combustion concern, repeated breakdowns, poor comfort, or a major repair that approaches the value of a newer system.

Tell Homara what is happeningTalk through the problem and get a personalized next step.

Repair may make sense when

The failure is isolated, the equipment has been maintained, parts remain available, and a qualified technician confirms safe operation after repair.

Replacement may make sense when

Safety defects, repeated repairs, unavailable parts, chronic comfort problems, or a large repair change the economics. A written diagnosis and comparable scopes are more useful than age alone.

Questions to ask

Ask what failed, how the failure was confirmed, whether a safety test was performed, what warranty applies, and which costs are excluded from the quote.

HOMARA VISUAL GUIDEFurnace repair-or-replace matrix

Compare safety, failure severity, repair history, comfort, parts, and expected ownership period.

1Write down the model and serial number.
2Collect the last two years of repair invoices.
3Ask for the diagnosis and safety findings in writing.
4Compare complete scopes, not headline prices.

What to do next

  1. Write down the model and serial number.
  2. Collect the last two years of repair invoices.
  3. Ask for the diagnosis and safety findings in writing.
  4. Compare complete scopes, not headline prices.
  5. Use Homara to organize the facts before choosing.
Tell Homara what is happeningTalk through the problem and get a personalized next step.

Common questions

Does furnace age alone justify replacement?

No. Age is one input. Condition, safety findings, repair cost, parts, performance, and household plans should be considered together.

Should I keep running a furnace with a combustion warning?

Do not ignore combustion or carbon-monoxide concerns. Follow detector instructions, leave the affected area when indicated, and obtain qualified emergency evaluation.

Sources and review notes

This decision support is educational and does not replace an on-site professional inspection, emergency service, permit determination, or insurance decision.