Hello AC Hacker! I am fascinated by your work! I also have an old house and have been researching geothermal heating, and I am a teacher and want to have students explore some of these ideas as well. Could you give me an idea of what you have spent on materials? I would like to try to duplicate some of your experiments and need to look into obtaining supplies. As I digest the postings further I will probably have more questions. Thanks for your work!
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