How to replace your furnace

Signs your furnace is dead

Many experts say you should consider replacing your furnace after 15 years because it might be reaching the end of its life.

We disagree.

Some furnaces will last 25 or 30 years — or even longer — so replacing a 15-year-old furnace just because is premature.

An experienced technician might be able to give you an idea of how much life your old furnace has left based on its service history and an analysis of how the components are functioning, but there’s no definitive way to tell.

Problems with the following parts usually mean it’s time to replace your furnace:

  • Heat exchanger (cracked)
  • Blower motor
  • Inducer motor
  • Control board (sometimes repairable, depending on furnace brand)

If the parts are still under warranty (a typical one runs 10 years) and these items are covered, do the repairs. But these parts often become faulty when the furnace is older. The repairs can be so expensive that replacement makes more sense, especially since one large repair can be the beginning of many repairs.