My plan is to connect the PE ground loop pipes to copper in the basement. The plumbing needs to take a sharp 90 degree turn and be routed along wall around various equipment before getting to the unit - about 10' each way. HDPE --> Copper --> Circulator --> Geothermal Heat Pump HDPE <-- Copper <-- Geothermal Heat Pump What is good material for the ground loop for inside the home? (Is there problem with copper?) What are good connectors for HDPE to Copper?