NOVELTY - The system has a closed loop comprising a radiator located in an enclosure, and provides two working fluid lines and a heat exchanger portion. A closed-loop pump is provided for pumping working fluid around the closed loop. A groundwater discharge line (360) houses a heat exchanger portion of the closed loop. Groundwater (GW) is directed into the heat exchanger portion to cool the heat exchanger portion during normal operation. A groundwater pump unit is provided for pumping ground water into the groundwater discharge line to cool the heat exchanger portion of the closed loop.    USE - Geothermal based air-conditioning system for controlling temperature and humidity of a remotely located electrical equipment cabinet.    ADVANTAGE - The system comprises electrical equipment cabinet having an interior filled with a noble gas such as helium (He), neon (Ne), argon (Ar), krypton (Kr) and xenon (Xe), and nitrogen, to prevent incursion of outside air into the housing and the air inside the housing. The system avoids the temperature fluctuations by dumping heat energy via the closed loop the into groundwater during hot weather and extracting heat energy from groundwater during cold conditions, thus avoiding extreme temperature variations inside the electrical equipment cabinet. The system avoids temperature stress on the electrical equipment by aligning the temperature inside the cabinet with the groundwater temperature. The system avoids sharp dips in temperature inside the cabinet that occurs with respect to low humidity in a desert.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for retrofitting a geothermal air-conditioning system to an electrical equipment cabinet lacking geothermal air-conditioning system.    DESCRIPTION OF DRAWING(S) - The drawing shows a front perspective view of an electrical equipment cabinet.    Groundwater (GW)    Electrical equipment cabinet (100)    Housing (114)    Groundwater discharge line (360)    Programmable controller (420)