There are two types of heat pumps...air source, like ours that works til about 15 degrees before the (LP) furnace kicks in, and ground source, which provides all HEAT. I don"t understand the post about ground source, with a woodburner backup! Ground source heat pumps provide ALL the heat. We built a new house in "97, decided against ground source since the payback was over 10 years, didn"t think we"d still be here, this late in farming. Since, we decided we"ll retire here, and put in an air source system. We buy very little LP, air source pump just costs the electricity to run it, and in summer is the AC.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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