Our entire geothermal system cost $11k including pipe, trenching, heatpump, ductwork, circulators, etc. After the tax credits we were out about $7500. Not bad and now the real saving have begun. We've had our system in for a couple years now and heating and cooling bills for the entire cabin are less than $100/mo. I know cabins in the same area spending $100/week or more on their propane heat. This DIY geothermal system will pay for itself in just a couple years.