I have a seasonal room that I don't use (was initially meant to be a porch then enclosed, only has one vent to heat/cool) and would like to convert into an open covered porch. The room is on a concrete foundation with storm windows and a slanted ceiling. this is a large house with no exterior porch with shade. I can install a sliding glass door from living room to this room. My question is, how to insulate the soon to be exterior walls? Also what to do with the ceiling tiles? change them to be more outdoor friendly. This room is about 14 X 18.