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 - Tractor Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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