so just got a new house very near perficat for me and been looking into geo systems for sum time. so this what i know. house 1300 sqft rounded up a tad. by my math should need 300 ft per ton and a 4 ton heat pump. i live in wi. the soil is loamy silt 49-1/2 in deep the bed rock slops from 10ft at rear of property to 15 by the house. it is poorly drained soil. and since a steamfitter by trade the piping the ezy part. i think 1 1/4 hdpe should be right. it alows for corect flow rate while not having a screaming velocity. the ditch plan i got is make a single trench lest 3 ft wide. so can run the supply and return apart but next to eachother. this where im not fully sure tho. should i run them 2 ft apart or use the slinky design witch ive been told is not a good idea. im all ears for help and advice. i think need 1200ft of hdpe pipe.