Geothermal energy is the heat from the Earth. It is considered a renewable energy source, and resources range from the shallow ground to hot water and hot rock found a few miles beneath the Earth’s surface. Almost everywhere, the shallow ground or upper 10 feet of the Earth’s surface maintains a nearly constant temperature between 50° and 60°F (10° and 16°C). Geothermal heat pumps can tap into this resource to heat and cool buildings. Besides heat pumps, many other technologies have been developed to take advantage of geothermal energy, such as electricity production and producing heat directly from hot water within the Earth.