I live in Chicago and have built a 3 season room. It will be heated only in the spring and fall. Not during the winter. It will not have AC either. THe inside is framed out and still needs to be finished. I want to put a wood ceiling in to change the look. However, because it will be exposed to the extreme temperatures of hot and cold I don't know what kind of wood I should use. Or if I should use the faux wood they use on decks and fences? Any suggestions would really be appreciate. THank you. Susieski.