Geothermal energy can be captured from the heat stored beneath the earth’s surface or from the absorbed heat in the atmosphere and oceans. In the first instance, geothermal energy can be captured from naturally occurring underground steam and be used to produce electricity. In the second instance, heating and cooling can be achieved by taking advantage of the temperature differential between outside air and the ground or groundwater.

Source: Natural Resources Canada

To learn more on the installation and maintenance of a geothermal system, download Residential Earth Energy Systems: A Buyer's Guide, published by Natural Resources Canada.