[TurboZamboni]

I know a dude who sells geo-therm. best done on new construction to be an affordable ROI.

No roof vents means too hot an attic and often ice dams.
If you have a traditional shingle roof, it’ll often cut in half the life of the shingles.

[Eric in the Ozarks]

And, you don't want to be the installer's first customer. I ran into a guy who had a similar system to mine put in new. It didn't work to his expectations and the tubes in the wells had leaks.