I'm not very "tech savy" when it comes to greenhouses, but last year was my first GH. I used the solar pool cover and cut it to fit all the way around the GH on the inside -- I used clothespins to hold it in place. I had some heavy duty clips, but the clothes pins did great -- and I could take it down when I wanted on an extra warm day (we're in Texas). Anyway, worked for me.
