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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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