Hello everyone, I am planning to install a 6 ton unit with a closed horizontal loop. I have spoken with several installers and all seem to have a different idea about the loop field that varies greatly. The smallest is 2 loop trenches 300 ft long with the loops 5 feet deep with 10 foot separation and the largest is 7 loops 250 feet long, 7 feet deep with 20 foot separation. I am in Northern Virginia and I have access to heavy equipment that will allow me to install whatever size loop field is appropriate. This is a major expense to me and I want my system to work correctly. Can anyone point in the direction of some design standards for the field before I become loopy myself? Thanks in advance for any help.