Also consider tint your windshield with clear 3M ceramic tint, and also all the windows. The ceramic tint will substantially reduce interior cabin temperatures. "Normal" black window tint will not reduce the heat the same way that the more expensive ceramic tint does.

Go on youtube and search for "ceramic tint vs regular tint" you will see massive differences in temperatures with heat lamps between ceramic tint and normal (cheap) tint. And a clear ceramic tint will not change the aesthetics of your car if you don't want a totally limo look.