One variation of putting a coolant loop into the ground is to just cut a deep narrow trench and loop the coil in it like a slinky pushed "sideways".[1][2] [1]

One variation of putting a coolant loop into the ground is to just cut a deep narrow trench and loop the coil in it like a slinky pushed "sideways".[1][2] [1] https://dandelionenergy.com/geothermal-ground-loop-frequently-asked-questions https://dandelionenergy.com/geothermal-ground-loop-frequentl... [2] https://www.energy.gov/energysaver/geothermal-heat-pumps https://www.energy.gov/energysaver/geothermal-heat-pumps