If you find that the sun is wreaking havoc on the inside of your home (or that you're just getting too much glare on the TV), consider adding some insulation film to your windows.
The process isn't actually too different from applying a screen protector to your phone (something us techies are very familiar with): just thoroughly clean your window spray some application solution on the window and apply the film, being sure to squeegee most of the fluid out so you don't get any bubbles. Not only will it cut down on glare and protect your home from ultraviolet rays, but it will help keep your home cool in the summer as well. Check out the video for a demonstration.
Window Insulation Film [DIY Life]