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 - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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