The life span of a typical residential HVAC system depends upon a number of variables including the initial proper design of the system as well as proper HVAC system maintenance. In general the equipment will last 10 years or more, while the ductwork will last for the life of the home.
The key is the proper design of the system, which includes the proper sizing of the equipment. This means that the HVAC contractor will consider a number of factors while designing the heating and cooling system including the outdoor temperatures during the winter and summer. In addition, they will calculate the heat loss and gain of the home thru the building envelope, especially the exterior doors and windows. A system that is undersized will typically run into issues before one that is properly sized. This is due to the undersized system running more than a properly sized system because the heating and cooling needs can never be met.
However, the biggest factor impacting the lifespan of a HVAC system is the lack of maintenance, including regular filter changes, cleaning of the units, checking the refrigerant levels, periodic duct cleaning and thorough periodic inspections. The best way to increase the lifespan of your HVAC equipment is to have a periodic check of the system prior to the heating and cooling systems. Most qualified HVAC contractors have a dedicated service department that can provide this periodic service at a very reasonable cost, which will extend the life of the mechanical equipment in your home!
