NOVELTY - The system has a circulation pump (144) to circulate the refrigerant within water tub recycle pipe (143). The water heat exchanger (142) is used to perform heat exchanging process between cold water and warm water passed inside water tub (141). An exhaust portion is driven by controller, so that internal air of main portion is discharged to outside. A sealing pad is closely adhered with surface of duct. An opening/closing plate is rotated by motor, to open and close the duct. An insert ring is inserted into seating groove. A presser portion is used for pressurizing the ring surface.    USE - Ground coupled geothermal heat pump system for performing air cooling of indoor.    ADVANTAGE - The indoor cooling and heating operation can be performed simultaneously by using a single system. The heat pump system with cold and warmth water tub can be realized easily. The heat pump system can supply the water for cooling indoor. The sanitary boiled water can be obtained. The heat in the heating source can be absorbed easily. The temperature of the system can be increased. The cooling-and-heating capacity of the geothermal refill unit can be improved. The heating-and-cooling efficiency of the system can be enhanced. The load of heating source is reduced, such that stable operation of system can be ensured. The damage of the system can be prevented effectively. The use lifetime of the system can be extended. The economical efficiency of the system can be improved. The exhaust fan portion is driven if the temperature and humidity of main portion is increased, such that the internal air of main portion can be easily discharged to the outside. The fine dust in the main portion can be easily discharged to the outside, while preventing the damage or malfunctioning of system. The fire break out of system can be prevented. The waterproof property of the system can be improved. The penetration of external dust or moisture into the inside of main portion can be prevented effectively.    DETAILED DESCRIPTION - The geothermal heat exchanger (121) is connected with the geothermal refill unit (110) by heat exchange pipe (122). The heat pump unit (120) and cooling-and-heating system conversion unit (140) are controlled by the controller. The branch pipe is branched from the geothermal recycle pipe (111).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the heat pump system.    Geothermal refill unit (110)    Geothermal recycle pipe (111)    Heat pump unit (120)    Geothermal heat exchanger (121)    Heat exchange pipe (122)    Cooling-and-heating system conversion unit (140)    Water tub (141)    Water heat exchanger (142)    Water tub recycle pipe (143)    Circulation pump (144)