If you are on a budget but can afford insulating board. I would wrap the room in something like house wrap. Then seal all of the seams with a good tape like gorilla tape. Then cover the insulation with refletex and tape the seams with foil tape. All available at your big box store. You should have a tight room. Even if I used batt insulation and plywood. I would still wrap the room and use refletex. Just my thoughts.
now THAT sounds like something i can do!!!!!! cheap ans sweet!!! thanks alot for that idea ijim. i get the insulation from the heat and refection at the same time. still gotta prce that stuff out though and see what it all will run me.
although i didnt plan to deal with the walls until later, this makes it possible to deal with them right now.
would you think that i could do the same thing for the ceiling as well to keep that heat out. i want to eventually (during the winter) install a attic vent fan; i saw one in HD for $78 with a 1000cfm rating with a thermostat, without doing the math, i think would do me just fine for a 9x12x9 space.
what say you?