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What Is the Average Lifespan of a Furnace?

Aug 22, 2022Furnace Installation

How long does the average funace last?

The life of a well-maintained furnace can be at least 15 to 20 years, but some owners extend their furnace’s life even further by performing routine maintenance and receiving prompt repairs.

Some factors affect a furnace’s lifespan. Here are some to consider:

Furnace Size

You need a system that’s the right size for your home.

Furnaces that cycle more quickly becomes more prone to wear out their parts. As a result, if the furnace is too big, it will turn on and off much too fast.

If your furnace cannot heat your home correctly, it can run too long and reduce the amount of heat your home receives, which can also wear parts out.


Ductwork that is too small, too big, or sealed too inadequately can limit airflow.

Poor drainage system for extremely energy-efficient furnaces

A fuel line installed incorrectly


Regular maintenance isn’t being performed.

Keeping the thermostat between 60 °F and 80 °F