I haven't heard about those, and with todays prices I wonder if they would be that cheap---just priced a mini split HVAC and the price has doubled since last year from $10k to $20K. If that price is true--it is a super deal, but probably wouldn't be effective for me either because we live in a small canyon and get virtually no wind. I do have a good well though and I've thought seriously about a self sufficient hydro electric set up using gravity to bring the water down from the upper part of the property to the lower part in tubes that contain multiple turbines. But like everything else, probably a pipe dream until I start feeling sufficient pain in my energy bill, LOL.