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I live in Tucson AZ. (Like Oldteleman) And everything we have is tinted (except the windshield). Comming out after sitting a long time in the sun it might still be 150F instead of 160F inside the car. (In the summer I keep a couple of paper towels that I use to grab the seat belt otherwise you can get first degree burns on metal parts of the belt.
However the real help is while driving. The A/C can cool the cabin better if the windows are tinted.
So my answer is: Tinting only helps "soak" temperature a little but helps total heat load on A/C a lot.
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