The advantage of the open loop is installation cost and efficiency. I have an open loop. There are no drilling costs as I use my existing well. I built a pond in my yard to receive the outflowing water. I plan on raising perch for harvesting. If that overflows, it will just soak into the ground as it is very sandy. I plan on piping overflow to a wetland I am constructing to grow plants. Open loop is also more efficient because the water temperature never changes. In a closed loop, the ground will drop in temperature as it transmits heat to the coil. Efficiency usually drops as winter progresses. The reverse is true for cooling in the summer, the ground temperature gradually increases.
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