Geothermal systems are heating and cooling systems that convert the Earth’s temperature into usable energy in your home. The ground absorbs almost 50% of the sun’s energy, which is absorbed by pipes underground. These pipes circulate a water solution that carries the heat to your home’s heat pump — which is where a geothermal heat pump removes the heat from the water and circulates it through you home’s central heating system. During the summer, the process reverses, and the energy is used to cool your home.