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My problem isn't the typical temperate zone hot interior temperature after parking in the sun but heat radiating from the headliner while driving after having parked in the high tropical sun that shines almost straight down on the roof. Except for the windshield, very little sunlight enters the interior through the side and hatch windows due to Honolulu's very high sun angle during the heat of the day. I use a reflective windshield sun shield which works well to reflect sunlight so that it can't heat interior surfaces.


So unlike in temperate regions, my problem would be dealt with better by reflecting as much solar radiation off the roof as possible rather than blocking the little solar radiation that enters the side and hatch windows.


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