Following two years of development, the Air-Conditioning and Refrigeration Institute (ARI) recently announced initiation of the Direct Geoexchange Heat Pumps (DXHP) Certification Program that covers factory-made assemblies including an indoor unit, a compressor unit, and in-ground refrigerant-to-earth-heat exchangers.
Using an underground heat exchanger and based on a standard initially adopted in 1999 by the Direct Geoexchange Systems Product Section, the equipment provides residential and light commercial heating, cooling, and water heating.