Thank you for your suggestion. I do not think it will work for this
greenhouse This greenhouse is a A-frame "roof" over a pit. It is less
then 4 feet high at the peak. It is 12 ft long and 12 feet wide.
but we are planning another greenhouse for the farm. I will explore
the idea of a thermal chimmney. I would like to do everything as low
energy as possible so I am looking into berms and water storage, etc.
The thermal chimmney is an interesting idea and I will read up on it.
I did post this on the photovoltic board, I assume that it got over to
the thermal board after the first post.
My plan at this point is to buy a 1/4 hp dc motor to replace the AC
motor and connect it to a solar panel. I will just wing it and see
what happens! If nobodies dies...I'll be happy!