Our geothermal heating and cooling system will require two 300 feet deep boreholes to accept the vertical closed-loop pipes through which water and anti-freeze will circulate to pump heat from the Earth into the house (in winter) or from the house into the Earth (during summer). The first well was completed today. We had 142 feet of clay before hitting bedrock and managed to avoid any aquifers. This is a great result since dense clay and bedrock are both great thermal conductors. With any luck, our second bore hole will be completed tomorrow.