Direct exchange geothermal heat pump

A direct exchange (DX) geothermal heat pump is a type of ground source heat pump in which refrigerant circulates through copper tubing placed in the ground unlike other ground source heat pumps where refrigerant is restricted to the heat pump itself with a secondary loop in the ground filled with a mixture of water and anti-freeze.

The simplicity of the DX designs is that high efficiencies can be reached using a shorter and smaller amount of buried tubing thereby reducing both the footprint and installation cost.