I recently had my roof done with foam. I was told that it would keep the house cooler in the summer. Well yesterday afternnon when I got home from work it was 102 in the shade, it was 83 in the house. That 83 felt very comfortable with the outside temp. so high. If you are thinking of getting a foam roof I would highly reccomend it. :)
over the warm weekend, a neighbor with a t&g roof came over to our foam-roofed place and remarked how it did feel cooler than theirs. made my day, since its hard to get that kind of direct comparison.