Spyke

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Am I going to reduce a room’s temperature covering a huge hopper window with either paper or reflective aluminum foil, but leaving the window a bit open when the sun shines directly into the window?

Look at aluminet. Woven thicker aluminum foil into a reflective sheet that wind can pass thru. You can specify the weave density to choose the % light blocking for your preference of wind and shade trade-off. I’ve got a 70% blocking one and use it a lot for camping in the desert. Available in different sizes and they come with a border that has ring holes for securing.

Can also put a fan in window and the shades used for car windshields around that to block the rest. Even better is to have a 2nd fan elsewhere to pull/push the air thru the building on the other side of your place.