horizontal loop field. Boring vs. excavation
I only have a few weeks to decide if I should install a geo system or not.(had our first major frost this am) live in south central minnesota, clay soil.
I am getting three quotes, 2 are in. First contractor wants to do horizontal BORING for the loop fields about 8 feet deep, the other wants to do horizontal EXCAVATION at 10 feet deep. Both will be 800 feet of loop per ton , Contractor one wants to use a two stage copeland , number two wants to use thee same 2 stage compressor, 4ton econar system. I am concrened about old foundations, rocks, debris etc. with the boring method. I am also concerned about effecieincy of the loop tubes being in contact with the ground which apparantely helps with energy efficiency.
Could anyone help with information.
The excavation method is more money than the boring method.
Thanks for any information.
Sept. 30, 2009
bore horizontal loop field
Thanks for the info. Crash 11, you were right. I called back the one contractor who wants to bore instead of trench and indeed they go down 15 feet with the bore machine and grout at the same time. Now what concerns me is they install 400 feet of tube per ton intead of 800 feet per ton like the other contractor wants to. Do you think this would be sufficient to handle a 4 ton HP in Minnesota? Just found out from the well company I have sticky yellow clay from 2' - 22' which apparently is good soil to have. Also this contractor uses the Bryant GT-PX model utilizing my existing propane furnace. They
would have to increase blower CFM on the existing furnace.
Again, any insight/information would be appreciated.