5 Star Review for Easy Fix Cold-Frame on Amazon.com by Dorey E. Evans of Springfield, VA USA
"I like to have fresh greens all winter and this is how I do it. I have two Juwel Cold-Frames. I sprayed black paint on two1-gallon bottles for each. Fill the bottles with water and put them at the back wall of the Cold-Frame. The sun warms them during the day and keeps the Cold Frame warm enough at night that the greens never freeze.
I grow chard, lettuce, spinach, leeks and sweet basil right through the winter.
During the summer, I use the automatic opener and grow warm weather greens in the Cold-Frame. When it starts to get hot, I throw a piece of shade cloth over the Cold Frame and leave the doors open several inches using the clips. Now I can grow greens through the summer and the deer can't eat them.
Good Quality Cold-Frame, you won't be disappointed."