Geothermal Power to The People: Forget Iceland, Hot Rocks Are Everywhere

[madokie]

3. When you have water going down and then coming back up it only takes a small amount of energy

to keep that flow going. Since this is a closed loop system the only energy you'd have to input is the energy to make the water flow which isn't much and the amount lost in the restriction of the piping. In the summer it would be more than in the winter because in the summer you'd have to overcome the small difference in the temperature of the water, warm water is lighter. In the winter that would be reversed as you'd be bringing up warmer water so you'd recoup most of that lost energy you expended during the warmer months lifting the cooler water up.
The end result would only be a fraction of the energy used to directly heat or cool the home whichever the case may be for a big energy savings overall.