Geothermal cooling is a process that uses the natural temperature of the earth to cool a building. The depth of the geothermal cooling system depends on the climate and soil type of the area. Generally, the deeper the system is, the more efficient it is. In most cases, geothermal cooling systems are installed at depths of between 100 and 400 feet. The deeper the system is, the more energy it can store and the more efficient it is. Additionally, the deeper the system is, the more stable the temperature of the earth is, which helps to maintain a consistent temperature in the building.