Typically, you can expect your heating unit to last between 15 and 20 years. This is highly variable, however, and depends on the quality and type of heating unit that you have. Those installed by home builders have shorter life expectancy of 8-12 years. There is a plethora of home heating methods, including radiant heating, but most homes use forced-air heaters. These heaters are what we generally base life expectancy on.