Geothermal heating and cooling uses a device called a heat pump to move heat to and from the ground. Like your refrigerator, which moves heat from inside the refrigerator to outside the refrigerator, our heat pump can move heat either to or from the ground depending on if the home is being cooled or heated. Energy Catalyst sells heat pumps that are sized for 36,000, 48,000 and 70,000 BTU capacity.