We finally had rain and it cooled things off. In fact, it's still raining this morning, very finely. Coolly.
I found gray sheers for the den windows, but they're too dark. I think I'll try white sheers. If they don't work, then it's on to some kind of wide-slat blinds or shades. The window set in the brick wall (which I painted) will be difficult to attach blinds since the wood frame is jamb against the brick. No nails in the bricks. I'll figure it out with Lowe's help.