Since your heating and air conditioning system is a significant investment, it makes perfect sense to try to get as much use out of it as possible. On average, most HVAC units will last anywhere from 15 to 25 years; however, depending on the model of the system and other important factors such as maintenance, this estimate can fluctuate. In this article, one of the leading furnace companies in the area reveals the life expectancy of common HVAC equipment.