TL;DR
A residential geothermal loop field in Utah typically costs $20,000 to $35,000 to drill, on top of the heat-pump equipment. Closed-loop is the right choice for most Utah homes; open-loop is rarely worth the water-rights complications.
Summary
Closed-loop vs. open-loop geothermal wells in Utah, what the drilling costs look like, and whether the energy savings actually pencil out for a Utah home.