Yesssssss
A guy in Mont?? or Neb??? Can't remember/find the site. He uses it as a heat source--with a very good design/documentation. Uses it for a greenhouse/orchard and I think his home too. This is in use in many parts of the world, I think maybe MANDITORY in Germany for passive design.
I would like to do this myself. I want to use a ductless minisplit/inverter system, but I am in a frozen hellhole with 7-8k HDD. I need 18-24kbtu at -20f
I am willing to hack to get a direct contact to earth source, but would prefer the air/air to keep it simple/in warranty etc.
A couple thou feet of sewer pipe and an airtight room/blower.
I really need to do something, I've been researching to long, and I'm all ears.
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