The typical lifespan of a furnace in Texas is around 15-20 years, depending on various factors such as the type of furnace, the manufacturer, the quality of installation and maintenance, and the frequency of use. Furnaces that are well-maintained and serviced regularly are likely to last longer than those that are neglected. Climate can also play a role in the lifespan of a furnace, with more extreme temperatures leading to greater wear and tear. In Texas, it is important to have a reliable and efficient furnace due to the hot summers and occasional cold snaps. Regular maintenance and prompt repairs can help extend the life of your furnace and ensure that it operates efficiently and effectively.