Anyone ever put tin foil over a window to reflect heat? I did it once in a older house I once lived in, and my husband did in college in his dorm. We put some over a large window today, that faces that backyard ( and the south) . no neighbors can see it, and no one can drive by and see it, so I'm not worried about looking tacky. Just want to save a lil money on AC. I planted two trees in the backyard, but that will take time> Anyone else use tin foil to reflect heat cheaply? We Live in South Dakota