Payback is going to be measured in decades and the unit will be worn out by then with ground loop. Water source from an existing well and returning to a ditch/creek/pond is the most economical geothermal. I have kicked around the idea of just using ground water and a heat exchanger. Ground water is approx 50F here. That would keep a shop and floor from dropping below 40F. If you are dry and out of the wind, 40F isn't a bad temp to work in. Local spot at a work bench from an overhead electric infrared heater would be all that's required. Of course no source of heat or cooling is economical with the wind blowing under the equipment doors and around the eaves.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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