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One contractor I talked to simply refuses to install a drilled ground source system. There's too much potential for what can be difficult and expensive repairs - if it doesn't cost an arm and a leg to drill the hole(s) to begin with. (In other words, backhoes and tubing for horizontal laying are relatively cheap.) They steer people to conventional pumps if a horizontal system won't work. Otherwise, the payback period may exceed the life of the system.
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