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...I can empirically answer: "Yes"
...anything that contributes to keeping solar rays from getting 'into' the car interior means there's less work for the A/C to do in cooling the air.
...an empirical example is when you drive under a cloud shadow on a hot day and the A/C suddenly "seems" to work better...it's the same A/C unit, only the solar loading (through the windows) has changed.
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