I have a Econar geothermal system in SE MN. It was put in in the 1990s and has been trouble-free (mostly). I don't even think the loop is 12ft down, but it's buried into the wetland (before that was made illegal). They just dug down to the water table (6-8ft?) and laid the loop into the water. The original plan was to use my artesian well instead of a loop, but since it only flows at about 5 gallons a minute, it wasn't enough volume for the application.
I still heat the house with passive wood heat and just use the geothermal for a backup. I have doubts about how much it would save over Natural Gas because when it's 30 below, the unit I have runs non-stop and can't keep up. That's a lot of electricity. Still beats LP or Fuel Oil easily though. If you have Natural Gas available, I don't think geothermal would be a good move economically unless the price of NG goes up.
It sure is nice for the central AC aspect during the summer months.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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