The nights aren't very cool in some parts of the world.
I wish bug nets for windows (or at all) were standard in Sweden.
In some places in the country you will be bitten by 10 thousand mosquitoes just because you dared to open the window for a minute.
I keep my PC in my bedroom so it's hard in general to keep the room comfortable but in the winter you can at least open the windows for a few seconds and nearly instantly make the room comfortable (and without insects). In the summer it's fucking impossible to keep the room cool no matter what you do. At least the PC has good cooling so it survives; I just wish I would.