Your HVAC system is going to be one of the bigger investments for your home and this leads to customers wanting to know how long their system will last. Typically systems can last between 15-20 years without significant repairs. This is all dependent on how the system is maintained and how the system is used. It’s inevitable that the system will fail even with proper maintenance and when a unit gets past 15 years old the efficiency will likely drop 15% to 25% compared to when it was newly installed. A big factor on how long your unit will last is how the unit is installed. In the middle of a cold or hot spell we can act on emotion and have a system installed that we didn’t research or have done too quickly that can shed years off the life of the unit. Improper duct size, improper refrigerant line size and poorly designed duct system are a few things that can shorten the life of your system.