Fortunately, things have happened to help the situation. Friends helped me to get some really good sun screens, and they have done their job. More importantly, they also helped me to get modern windows in that area of the house. That's been a really big difference.
Still, it gets very hot in that part of the house, so I keep looking at options. We considered another tree, but with a pool, trees tend to have shedding leaves, and the small trees blossom and I don't want more bugs and bees in our yard.
Could awnings be the answer? Perhaps an Evergreen (but it would block the view)? How about something like vinyl shutters? Would they help at all? I just really need something that will block the sun from beating down on those windows.
Sadly, I have that financial issue and can't afford to really do anything, but I keep hoping I'll find a solution that doesn't cost much. I'm so not looking forward to those high temps.