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Try the perforated reflective material designed to put in your attic. It reflects away most of the radiant heat that penetrates the roof, before that radiant heat comes through the upstairs ceiling and into the house.
A white or light-colored roof is also a good idea, as it reflects away lots of solar energy, not just in visible spectra but also ultraviolet and infared.
Best to keep the house from getting too hot in the first place, rather than spending dough to extract the unwanted heat.
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