I'm surprised no one had mentioned these screen-like products installed on the outside of east, south or north facing windows to dramatically cut the amount of UV rays from the sun entering the home.
We installed ours this spring from EZ Snap and the difference was amazing. It immediately reduced our temperature by 15 degrees F.
And, you can still see outside with these exterior solar blinds installed.
We've written several articles on our blog about these fantastic products. If you are interested you can find the first article about our experiences here:
This is a new product from this manufacturer this year. Other manufacturer's I understand have had their's out for a couple of years.