A neighbor has a geo thermal. I went over when they were installing it and here what I can say. The GT system is a closed loop system. He has 2 375 ft deep loops for heating and cooling. All the glycol is the tube either heats or cools the house via a heat exchanger/air handler.

Fracing if I understand the process uses High pressure to "FRACTURE" the shale to release the gas.

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86 300SDL. 250,xxx on #14 Head. One eye always on temp gauge.. Cruising towards 300K