Looking out of my windows at some of the houses in my neighbourhood, a lot of folk have their windows and doors wide open in the hottest part of the day. This lets all the hot air in.
I was taught many moons ago (hot summer of '76 I think) that you open all the windows early morning, then close them and the curtains or blinds when the temperature starts to rise. Then open them again in the evening once cool. It works.
You may already do this. A lot of my neighbours don't seem to. Seems like a no brainer to me.
Last weekend, in Rutland, the first statue in Britain of the late Elizabeth II was unveiled.