Anyone ever heard about this one?
www.mb-soft.com/solar/intake.html
I've been looking at earth tubes for my place, as well. There have also been some discussions on the forums. (Do a search for "earth tube") As the site you referenced mentions, you need to ensure you design the system properly to prevent problems with mold (especially in high humidity). I'd really like to see one of these systems in operation. If anyone knows of one, let us know.
JD
Joined: 2008-01-15