Geoexchange technology works similar to a reverse-cycle air conditioner, except instead of relying on electricity, the system uses ground water as a 'heat source' or 'heat sink' to heat or cool the home.
While outdoor temperatures fluctuate from winter to summer, the below ground temperature remains at a relatively constant 20 degrees year-round.
To make the most of this constant temperature, ground water is sourced from the aquifer and piped into a geoexchange unit in the garage of the home. Within this unit a heat transfer occurs between the water and the air, effectively using 'free energy' from the ground.
While some electricity is still required to run the unit, the amount of power needed is significantly less. Initial studies by The University of Western Australia estimates household heating and cooling bills could be reduced by as much as 50 percent.
Check out the video below for more information on what this project is all about.