on the hottest side of our house we put quilts over the windows it lowered the temperature by 5 to 8 degrees, i'm 68 and I remember old people doing this years ago with heavy wool blankets , cover the whole window top / bottom inside, . i didn't think it would work but it does. it totally even helps in the middle of really bad winters, it cut back on our heat bill in the winter time too..i know it sounds weird and dumb to some people but it does help a lot, you can create your own window quilt to help you , if like to decorate.
