Thanks for the idea on the radiant heat, Arlene. I have some ideas on heat retention that involve tanks of water on the north wall. I'm going to be doing aquaponics in this greenhouse, too, and all that water will provide some good warmth retention.
Tom, I'm thinking more of a solarium approach. I wouldn't mind using salvagable material but I want the greenhouse to look good because it's front and center. Check out the photo of the site below:
The greenhouse will be directly in front of that red building there, where all the cannas and tapioca plants are. As you can see, our driveway goes right in front of it so it'll be one of the first things you see when you pull in. So I'm willing to buy everything to make sure that it's uniform.
