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As long as you have scheduled annual furnace maintenance, it should easily last over 15 years. Although some furnaces can last more than 40 years (extremely rare), the average life of a furnace is around 15 to 30 years. Wondering what the average life expectancy of a gas furnace is? There are mixed opinions about furnace life expectancy. Read on to find out how long a furnace lasts and when the right time to replace it is. While we can’t tell you exactly how long a furnace should last, we can certainly provide you with some info on average furnace lifespan, factors that affect furnace life expectancy, furnace replacement signs, and some ways you can delay the inevitable. It’s difficult to give an exact amount of time because there are so many factors involved.