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I have working AC on my cars, so blocking the sun isn't worth the time and effort to me. My guess is the extra energy required of my AC to cool the cabin down from being a few degrees warmer would never be measurable.
Normally I crack the windows open when it's hot out, but now that I think about it, the extra wear and tear on the window actuators might not be worth the effort. I do have a moon roof and often leave that cracked. Perhaps that is enough. If anything wore out due to my effort to cool the car a few degrees, it wouldn't be worth it to me.
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