Geothermal Heating and Cooling systems

Here is a great site that explains how geothermal heating and cooling systems work:

http://aztechgeo.com/residential-geothermal/how-it-works/

When listing a property with a Geothermal Heating and Cooling system, use the Heat Fuel Type field to select Geothermal:

You can also use the Energy Features field to select Geothermal Heat:

If you enter Geothermal Heat as your fuel type, you will not be prompted to fill out the Fuel Tank Location field- a buried Geothermal system does not contain any fuel, therefore is not considered a fuel tank.