I recently added almost clear tint to all my house windows, it stops a lot of UV and heat from getting in the house, it has reduced inside temps by at least 10 degrees.
As a test I put some on my front windshield and side windows, only the top 6-12 inches as it was scraps. It definitely helps lower temps, If I could I would do all the windows.
Here is a link to the product I used.
Energy Film - Energy Efficient - Insulating Window Film