VADAVE, I've never heard of any heating system that compresses air to produce heat. I"ve had a geothermal system for 17 years, and it has nothing to do with compressing air. They are simply air conditioners, using Freon, but instead of using 90 degree air to cool the condenser in the summer, and 0 degree air to warm it in the winter, it uses 55 degree water from a ground source to heat or cool the Freon in the condenser. This makes it much more efficient than a conventional air conditioner or heat pump. The system pumps Freon the normal direction to cool, and reverses the direction in the winter. Mine has a propane backup, but if the heat pump is running properly, propane is never needed. Mine intentionally has no electric heat strips, as they are very expensive to operate.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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