I bought a king size comforter at a local tag sale and am going to hang it up on the wall behind my bed. I live in a mobile home and it gets way too cold in my bedroom.
Exterior walls? You're talking outside walls of a building? I'd rather try heavy duty plastic or bales of hay/straw. If you are meaning the walls next to the outside walls of a home's interior; then the polyester filling in quilts would help some, but what may help more and is pricey are foam insulated drapes you can purchase at WalMart and sold per panel for about $17.00.
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