I bought some heavy 'privacy' type curtains which keep the cold and heat out and the light too, as well. I also bought a 144 inch metal electrical tubing pipe, which works perfectly for the drapery rod for the new curtains. *LOL*, I bought it at Lowes, but bought the curtains at Big Lots. I actually had to return the curtain rod to Big Lots because I couldn't figure out how to assemble it. Lowes had exactly what I needed for my curtain rod. I am guessing a few of the shoppers at Lowes got a giggle or two watching me haul it out to my car and go down the road with it hanging out the back window. Luckily, it sat flush against the side of the car, so no flag was necessary.
Sometimes it's electrical tubing that makes the better curtain rod.
And, it's a hella lot cheaper ($3.55 per rod).