Before the homeowner turns up the thermostat, before the HVAC contractor installs the equipment, and before you place the loops and grout the borehole, there is Step 1: the drilling of a good hole that stays open and allows for the loop to be installed to the required depth.
You, regular readers, will recall that I have been doing a few columns lately on a product that was popular in the past, the pitless adapter tank or PAT.