Geothermal air conditioning is not new; the application has been in operation in many countries around the world for decades. The use of the earth's ambient temperature has long been an efficient means of operating air conditioning. Earth to Air Systems brings a whole new application to geothermal using direct heat exchange; a revolutionary improvement to an already highly efficient process.

Earth to Air Systems patented Deep Well Direct Exchange (DWDX) Geothermal Air Conditioning can provide energy savings of up to 80% over traditional systems. ETA Sytems use Ozone safe R-410a refrigerant, can achieve COP (co-efficient of performance) of 85%, and uses no water.

Air temperatures can vary by 40⁰C or more over a year, but the temperature below the ground might only change by half this amount. The variation reduces with depth and at about 10 metres the earth's temperature is constant and close to the annual average air temperature.

The ground source heat pump draws heat from the earth and transfers it to the space or load it is heating. (Heat pumps tend to be thought of as air conditioners for buildings. However, they are equally as effective in drying materials or producing hot water). In winter, when the air temperature can get close to 0⁰C, the temperature a few metres underground could be 15⁰C, making it a better source of heat / or cooling than the air.

Earth to Air System Overview