Geothermal HVAC systems are known for their longevity and durability. With proper maintenance, a geothermal HVAC system can last up to 25 years or more. The life expectancy of a geothermal system is largely dependent on the quality of the components used and the frequency of maintenance. Regular maintenance is key to ensuring the system runs efficiently and lasts as long as possible. Additionally, the environment in which the system is installed can also affect its lifespan. For example, if the system is installed in an area with extreme temperatures, it may not last as long as a system installed in a more temperate climate.