It’s much easier to answer this question for residential applications. The price is composed of three pieces: the drilling cost, the loop field installation including underground piping to/from the building, and the HVAC system installation. Many times the driller is also the installer, but not always. Sometimes the mechanical contractor controls the overall bid. In general, here in the SE PA area prices for the geothermal installation are running between $12/ft to $14/ft. There is another $1600 in the trenching, penetration, backfill, grading & re-seeding. So, for a typical 2500 sf home, one might expect to pay around $15,000. The extended range (4 ton) heat pump installation, circulator, water/methanol fill, and commissioning might add $8000 for a total price to the owner of $23,000. This could be higher or lower based on the thermal conductivity of the site and how easy or difficult it is to drill and contain the spoils.
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