The answer to 'how long does furnace last' is that the average lifespan of a furnace is 15-20 years with proper maintenance. Furnaces are durable appliances, but their longevity depends on factors like the quality of the unit, how often it's used, and how well it's maintained. With regular tune-ups and repairs, many furnaces can operate efficiently for well over a decade.
Proper maintenance is key to extending the life of your furnace. This includes changing the air filters regularly, cleaning the blower and other components, and addressing any issues promptly. Neglecting maintenance can cause a furnace to wear out much faster, potentially needing replacement in as little as 10-12 years.