Geothermal systems exploit the natural stable temperatures of the earth below a certain depth to provide supplemental heating or cooling in a hydronic thermal HVAC system. Early forms of this technology relied on arrays of air ducts buried deep underground but were prone to condensation and mold problems. Contemporary geothermal systems employ fluid filled polyethylene tubing arrays similar to those used for radiant floor heating which are laid in trenches about 2-3 meters deep or combined with welded-in U-link caps and inserted into sets of boreholes some 30 meters or more deep. The buried arrays are then linked to a heat exchanger unit alternately placed in-line with the heating or cooling networks of a hydronic thermal heating and cooling system. In forced air HVAC systems the heat exchanger is used in-line with an Air Handler Unit
The Utilihab Geothermal system employs heat exchanger modules designed to integrate with the modular Air Handler Unit of Mini-Duct High Velocity HVAC system, the Modular Hydronic Heating System, the Compressor unit of the Mini-Split AC system, and the Solar Chiller system.