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Keep heat out, a white bedsheet or better yet tin foil outside your window to reflect away the sun is great. I would also back the tinfoil in something so it doesn’t directly touch the glass, cardboard or something. You want it outside the glass rather than inside. At best inside is much less effective and at worst you can break window panes with foil on the inside due to the concentration of heat (though unlikely). Try not to cook too much or use other heat causing appliances.

For dealing with the heat that is in: I’m a big proponent of soaking a T-shirt in cold water, then sitting infront of a fan. The evaporative cooling effect is really quite strong. Otherwise stay hydrated, keep your salts high so you can sweat more effectively. I like to keep a water bottle in the freezer that I keep pouring glasses from and topping up. It’s always just partially frozen ice cold.