I had heard a lot about how expensive these systems could be,  so I did some research into how these systems work and decided to give it a try.

You can find lots of information about geothermal systems by searching the web.  I found an instructable where someone used the temperature of their well water to cool their house.  It made me think " If I could tap into this temperature difference in a closed loop system it could be useful " so I started digging.