I had the Hueper Optik tint put on my CE this Spring and it has really made a difference in the comfort of the car. I don't know if the ambient temperature is lower, but I do know that the sun doesn't feel hot on me on the window side anymore. That makes a huge difference.

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I never go far without a little Big Star

1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k