The lifespan of most typical Heating & A/C systems is 15 to 25 years, then however, the Heating & A/C equipment’s overall life span greatly depends on the type of the program & service! Other factors may easily affect an Heating & A/C system’s lifespan, such as terrible service on your unit, which can certainly lead components to wear out & shorten the system’s lifespan, but then with official service plans, Heating & A/C systems last longer as small troubles quickly get detected & fixed early. Heating & A/C units in the coastal regions have highly reduced life spans due to the salt corroding of the condenser unit, a terrible quality HVAC program will have a shorter lifespan compared to a high-quality unit, then improper upgrades done to your Heating & A/C unit will result in a shortened lifespan! The Heating & A/C unit definitely has weird types of components with varying lifespans. The gas furnace has a lifespan of 20 to 30 years at this point & is updated when the heat exchanger starts leaking. Oil gas furnaces, I’ve heard, on the other hand, with questionable quality may last between 10 to15 years, but most boilers last longer than oil gas furnaces. They have a lifespan of 20 to 30 years & easily should be updated when the heat exchanger starts leaking… Most air conditionings last about 15 to 20 years. They have shorter lifespans of 7 to 12 years in coastal regions. Regular service from an Heating & A/C contractor will help prolong your Heating & A/C equipment’s overall life span as they will be able to diagnose & service any failing unit in your home.