Hi, Windsurf:
You may have misunderstood me. I meant "windshield," the frontal glass only, should not be tinted or you run the risk of getting a ticket and maybe even a court order to remove your tint at your own cost. I did not intend to say or imply that you shouldn't consider tinting your side and back windows (as I have done).
If you use a sunshade for the front windshield, you can prevent fading and reduce internal heat.
I don't know about you, but I'd rather just keep it (the front windshield) legal. I just don't have the time to get pulled over and explain myself to a cop or later, a judge. I've got too much other stuff I need to do!
Hence, my suggestion for sunglasses. I wasn't being flip; honest!
Have a great day!