In general, without maintenance, the average HVAC system will have a life expectancy of about 15 years. With routine maintenance, HVAC systems can last up to 10 additional years. Remember that the average lifespan of an HVAC system ranges from 10 to 25 years, depending on the climate and the type of heating and cooling system you have. However, your HVAC system may last less time if it has been overloaded due to insufficient insulation and unwanted airflow (due to unsealed air leaks).
Learn how to find air leaks in your home. On average, your HVAC system will last between 15 and 25 years, depending on your brand and the other factors mentioned above. However, it's also good to keep in mind that the different components of your HVAC system have a different lifespan. What most homeowners don't know is that, even with a newer, more energy efficient HVAC system, if your home isn't properly insulated or doesn't have professional air sealing, it automatically shortens the life of your HVAC system.