Hi Jim,
Really enjoying this greenhouse forum. My husband found our greenhouse on Craig's list. It had been removed from a house down cape by the original installer. We started this project in July of 2019. I live in Massachusetts Zone 6a. Do not know enough yet to do too much, and obviously a bit frozen in place physically and financially right now. We are completely insulated and set so the sun pretty much flows east to west over the greenhouse perpendicularly. Took a bunch of less than healthy trees down for safety. What is amazing to me is the drastic swings between day and night in temperature inside the greenhouse right now. I have been investigating how we could keep consistent warmth now and in order to grow inside for Nov. 2020-May 2021, with little funds and lots of willingness to be creative! Anyway, thank you all who ask and answer! I am learning a lot!!