What is the earth’s energy?
The Sun has always provided heat for the earth. Its energy warms the earth directly, but also indirectly. Its heat evaporate water from the lakes and streams, which eventually falls back to earth and filters into the ground. A few meters of surface soil insulate the earth and ground water below. The warm earth and ground water below the surface provide a free, renewable source of energy for as long as the sun continues to shine. The earth under an average residential lot can easily provide enough free energy to heat and cool the home built on it.