Stop the energy before it ever even enters your living space. If you have any way of doing so, affixing shades OUTSIDE the windows will go a long way to helping you. It's not everything of course, but it's not nothing either.
I live in East Tennessee, US, and it's hot and humid here. During the day I keep everything closed up as much as possible. When it cools off at night is when I open all the windows and put fans in - one blowing in, one blowing out. Generally if the temperatures go below about 18.5C, I'll do the open windows thing. Anything warmer than that and the fans don't help much - unless you're unfortunate enough to have no air conditioning, in which case do whatever you can.
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