Quote Originally Posted by stinkyattic
Try flat white paint. That's close to the reflectivity of mylar and cheap. So are the emergency blankets Ciggies mentioned.
He can't use paint.. part of his problem. Stinky is right, if you go to walmart or Academy or some hunting store or whatnot you can find emergency blankets. They may be called solar blankets, or Emergency solar blankets.. or what not.

If you can't find that then go buy some push pins and buy some flat white poster board (the flimsy kind you used for school projects) and line your walls with that; flat white of course :hippy:.