Different types of furnaces last for different numbers of years:
A gas furnace: 15 to 20 years
An electric furnace: 20 to 30 years
An oil furnace: 30 years and more
Depending on the type of furnace, the owners can continue using it. However, regular maintenance is essential for the efficiency of furnaces; otherwise, owners may have to contact an HVAC company for heating replacement services in Yuba City, CA, earlier than expected.