We have a standard construction 3500 sqft house with a 4.5 ton forced air heat pump.
Our ground loop is 6000' of 1'' pipe in 5 slinky trenches 100' long each.
The slinky is standing vertical in the trench between 9'and 5' depths.
My email is: dean@palacegeothermal.com.
Please feel free to make observations and suggestions