How does Direct Exchange differ from Water Source Geothermal?
Direct Exchange (DX) Geothermal does not require water (and water pumps) in the heat transfer process. By removing a step of heat transfer (Water Source systems use water as a conductor between the ground and a heat pump), Direct Exchange systems are more efficient than Water Source systems. Furthermore, by using refrigerant for primary heat transfer, more Btus can be transferred per cycle than in Water Source systems.
