DIY Air Conditioning

[TOF]

I'm really going to show my age here, but..... My mum used to hang wet cotton up at open windows in the height of summer. It made a remarkable difference. I think it worked because a) the amount of sunlight was reduced and b) a certain amount of evaporation took place and the breeze entering the room was cooled because of it.
Often simple is better.

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Thinking about it further, this could also improve the air quality by trapping particulates?
Thanks for reminding me, all I have to do now, is keep it in my peabrain til summer