Hello all- I am new to this, but i have a basic understanding on how geothermal heating/cooling works. My question is with Geothermal heating/cooling types, I have spoken to one installer who uses the refrigerant to transfer heat directly back to the ground and others which utilize water/antifreeze solution. Is one type "better" than the other, or does it come down to cost. I was told the "DX" system uses 3" holes drilled in a conical pattern out from a manifold 65-70' deep with the copper tubing carrying the coolant directly into the ground. the others mentioned 200' holes drilled at a much larger diameter. thanks for any help you can offer.