I realize this is an old topic, but installing a geothermal HVAC system sounds very interesting, and I wanted to share my opinion. It's nice to see that you are also considering the environmental impact. I also like your out-of-the-box thinking and use of alternatives to traditional pipes. It seems that with this knowledge, you could become a good plumber and make good money, as plumbers are in high demand, and you can see for yourself at
https://www.howtobecomeaplumber.org/are-plumbers-in-demand/. Good luck with the installation, and your new system brings you energy efficiency and cost savings.
