I've had a closed loop horizontal system for 13 years, in a 2500 square ft house. 750 feet of pipe at 6 feet under. Mine is not pressurized and can't see any reason it would make a difference. The liquid is not compressible, so it's not going to know the difference, should perform the same either way. Other than a few problems after the initial install, ours has worked great, and I'd certainly do it again. I was told that the propane backup would be needed if temps dropped much below 20, but it handles the heating at well below zero, and never a problem with cooling.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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