The life expectancy of a furnace depends on a number of factors, including the quality of the unit, the level of maintenance it receives, and the environment in which it operates. In general, however, furnaces can last anywhere from 15 to 30 years.
There are many things that homeowners can do to help extend the life of their furnace and prevent premature breakdowns. First and foremost, it is important to have the unit serviced regularly by a qualified technician. Additionally, making sure that filters are changed on a regular basis can also help to improve efficiency and prolong furnace life. Finally, keeping the area around the furnace clean and free of debris will also help extend its lifespan.