The answer to 'how long will furnace last' is that the average lifespan of a furnace is 15-20 years with proper maintenance. Furnaces are major investments for homeowners, so it's important to understand their typical longevity. Several factors can impact how long a furnace will last, including the quality of the unit, how often it's used, and the level of maintenance it receives.
Properly maintaining a furnace through regular tune-ups and filter changes can help extend its lifespan. Homeowners should also be aware of signs that a furnace is nearing the end of its useful life, such as increased energy bills, strange noises, or uneven heating throughout the home. When a furnace is over 15 years old, it's a good idea to start budgeting for a replacement, as older units become less energy-efficient and more prone to breakdowns.