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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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