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What types of geothermal heat pumps are available? There are essentially two types:
Water based geothermal heat pump units, which include:
1) Open loop units that pump water from the earth or a pond, exchange heat and then dump the water.
2) Closed loop units that circulate a water and antifreeze mixture in a closed plastic loop, extract heat from the earth, exchange that heat into the refrigerant circuit through a heat exchanger, then distribute the heat using the refrigeration circuit.
Direct geoexchange systems, including the EarthLinked® brand, that directly exchange heat with the earth by placing the refrigerant circuit in direct contact with its heat source for heating and its heat sink for cooling.
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