A conditioner for the air in a structure which includes a gravel body beneath a building slab. The gravel is in thermal contact with the earth beneath the slab. The earth is a cold-sink which exchanges heat with the gravel body and thereby with air which is forced through the gravel.

This invention provides a primary uniform heater in the natural temperature preserving main body and it is conducted to a room needed to be heated, where the temperature can disperse openly; the temperature is transferred by the heat-conductive fluid by a main pump, or further by a shunt pump; that is, fresh air enters into the primary uniform air-heater through an open filtered inlet, and enter the primay uniform heater of the natural temperature preserving main body and then it is pumped through a transfering tube to a detector in the room needed to be heated. If the conductive tube is long enough to be buried in the natural temperature preserving main body, the primary uniform heater can be omitted and the tube is made of good conductive material's to actuate the function of a primary uniform heating power; a primary filter, such as active carbon filter, tester for harmful gas, and air fresher, can be attached to the inlet and the outlet of the fresh air.

An underground air conditioning apparatus for underground cooling outside air directed into a space comprising an open-air inlet for admitting outside air including air quality control apparatus including an above ground intake and a below ground outlet manifold, a blower for creating positive air pressure, a well means for providing an enlarged conduit for conducting the admitted air below the ground surface to a heat exchanger apparatus positioned underground and surrounded by soil segment, earth-embedded conduit means for exchanging thermal energy between the admitted air and the earth said earth conduit, extending underground between the well means and the space including a plurality of open-air tubes arranged in a tier in a common plane buried in the earth having an inlet end and an outlet end. Also included are inlet manifold means for distributing the outside air through a plurality of ports to the inlet end of the tier of tubes laid underground and outlet manifold apparatus for collecting the cooled air pumped through the open-air tubes via a plurality of outlet ports communicating with the open-air tubing; laid underground connected to sensing devices for detecting inlet pressure and outlet pressure, poor quality conditions and inlet and outlet temperature; and switch apparatus for directing the path of the incoming air by detecting the coolest heat exchanger path volume and path.

An enclosure for our door electronics having an underground ground sleeve for providing a heat exchanger between the surrounding ground and a first fluid circuit. The enclosure also includes an ambient single pass fluid circuit. The geothermal fluid circuit is substantially closed such that approximately 20% or less of the volume in the closed circuit is exchanged during circulation.

An apparatus comprising a geothermal cell and recovery system comprising a heat exchange zone located in the earth and separated from the earth by an impermeable barrier. A housing containing a fluid pump and compressor is submersed in heat exchange zone and a fluid conduit return assembly is positioned in the bottom section of the heat exchange zone. A fluid discharge assembly receives fluid from the pump and is positioned in the top section of the heat exchange zone. An underground heat pipe extends through the heat exchange zone. Back-fill material is positioned around the underground heat pipe and the housing heat pump is connected to said underground heat pipe.