Hey Keoma ... I was surfin the solar systems on the net when I came across this thing about "Pop can solar" and I immediatly thought this would be a great way to extend the growing seasons for a green house system. It is so cheap and so simple and works so then I thought about it some more and I realize that could take care of the day temps but what about the nights that get longer the deeper we get into the winter and the answer was the heat sink idea od 45gal. barrels of water heated by the solar panels at the same time as keeping the temp up in the day in the green house where you have to water anyway so all the components are there.... The idea may or may not interest you but check it out it is way to simple..

Thank you for the Beautiful Christmas Wishes Howard! I Send you wonderful and creative wishes for the new year!