[DannyBee]

FWIW: I had geothermal in my house in maryland, and loved it. The system consistently beat the listed performance specs, which were detailed and complete and easily findable. See the submittable data at https://www.waterfurnace.com/residential/products/literature

This is compared to air heat pumps, where they give you a single number with no factors, and your system rarely will get that number given your set of variables. You can get the full performance sheets if you nag the crap out of them or you are a contractor and have access to the service site.

It is significantly more common in areas on the east coast (which has a good climate for it) and also areas where wells need to be drilled anyway.

It's less common in areas with city water/sewer.

When i talked with the well drillers, they were doing a bunch of residential geothermal installs each week, so ...