In general, a well-maintained HVAC system can last between 15 and 25 years, while poorly maintained systems may only last 10 to 15 years. Trane air conditioners typically have a lifespan of around 12 years. It is important to note that the average lifespan of heating and air conditioning systems varies depending on the climate and the type of system you have. More expensive models tend to last longer.
Central air units usually last between 12 and 17 years with regular use and proper maintenance. They tend to fail sooner than components that produce heat because moisture passes through the system and is exhausted. The chemicals used in the system to cool and dehumidify the air, as well as the chemicals that pass through the system from the building materials of the house, are corrosive to the copper elements of the condenser and can cause them to erode and decompose. The size of the unit does not affect its lifespan, unless it is not suitable for your home.
For example, if you have a small 1.5 ton air conditioner trying to cool a house that actually needs a 5 ton air conditioner, it will break down much faster from overuse than a suitably sized (but more expensive) unit. The only way to know for sure if your heating, ventilation and air conditioning system is underperforming or if it is overworked is through a professional energy audit or an inspection by an HVAC technician. What most homeowners don't know is that they don't even have a newer, more energy efficient HVAC system. If your home isn't properly insulated or professionally sealed, the lifespan of the air conditioning system is automatically shortened. Even better, if you have a home warranty, maintaining your air conditioning system won't be as expensive without it and you'll save yourself the chance of replacing the entire system ahead of schedule. Air conditioning technology has come a long way and the energy efficiency of your home is affected by keeping the oldest air conditioning technology. Many utility companies offer HVAC rebates when you're ready to upgrade your HVAC system to an energy efficient model.
As a result, service and minor repairs are performed more frequently and extend the total life of HVAC systems. In addition, they cover the costs of replacing them when it's finally time to replace them. Each component of an air conditioning system is complex and, often, what appears to be a total failure at first glance is actually just the rapid replacement or repair of a part of one of the systems. And yes, replacing air conditioning systems can be expensive, so it's a good idea to plan ahead and save before you need to immediately replace air conditioning units or ovens.
