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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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