A furnace typically lasts from 10 to 15 years, depending on the type of furnace and whether it is regularly maintained. Proper maintenance includes annual tune-ups and cleaning of the air filters. If these steps are not taken, your furnace may last a shorter length of time. High-efficiency furnaces with stainless steel heat exchangers tend to last the longest, up to 20 years or more. If your furnace is not regularly maintained, however, it may not perform as efficiently, and its lifespan may be reduced. A good rule of thumb is to have a professional inspect and maintain your furnace each year. With regular maintenance, you can ensure that your furnace will last for many years to come.
It is also important to consider the environment in which your furnace operates. For instance, if your furnace is located in an area with a high concentration of dust and other airborne particles, this can affect its performance and longevity. Additionally, if your home has hard water—water with an unusually high mineral content—this can corrode the interior components of your furnace, decreasing its lifespan.
To make sure that you get the most out of your furnace, it is important to not only have regular maintenance but also to select a high-quality model when buying a new system.