The greenhouse will be 8' (from the house) x 16' (along the house) against the south side of the house. So the north side of the greenhouse is definitely covered - from an insulating point of view. 8' is as far as I can go - then I run into a property line problem. (I'm in a very old neighborhood with close homes.) Height against the house will be 9', decreasing to 5' at the outer wall. Thinking I'm going to have to run air ducts along the outside wall to keep the temp even. No problem sharing the polycarb site:
Greenhouses, Sunrooms, Misting System Kits & More!. They have a 32mm clear that's 1.25" thick, R-value 3.57. Their product name is Macrolux. They are actually Ecologic Technologies Inc. in Pasadena, MD.