Geothermal energy is the heat from the Earth. It’s clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth’s surface, and down even deeper to the extremely high temperatures of molten rock called magma.

Here is a link to a great article from Green Builder Media on using Geothermal Energy to heat a tiny home.

http://www.greenbuildermedia.com/tiny-houses/blog/heating-a-tiny-small-house-geothermal-heating-and-cooling-heat-pump

http://www.greenbuildermedia.com/tiny-houses/blog/heating-a-tiny-small-house-geothermal-heating-and-cooling-heat-pump