I don't have any doubts about the effectiveness of the A/C, but I have to park my car in a school parking lot (uncovered, full sun) 5 days/week. I'm thinking? hoping? that tint may help decrease damage to the interior as well as keep the interior temperature more managable during the dog days of summer. What do you think?
A custom Sunshade for the front window is a lot cheaper. Mine has been sitting in full Sun five days per week for 50 months and the gray interior looks new.