Opening (and shading) your windows is vital to keeping the heat at bay. And turn things off and take a cool shower
It’s tempting to throw the windows open all day in the hope of a breeze, but when it is really hot outside, you only let in hotter air.
Open the windows nice and wide overnight (if it is safe to do so) or early in the morning to let cooler air in, then shut them as the outside temperature climbs.
Try to generate a through breeze by opening windows on opposite sides of your home or from top to bottom.
A lot of heat comes through windows as thermal radiation, which warms the surfaces and air in a room, raising the ambient temperature.
