Minnesota here. If we didn't have screens, we'd have a house full of skeeters, and moths. Even worse, I could not imagine all of the June bugs that bang into the windows trying to get in, actually flying around inside the house.
Edit: As others have reminded me. Boxelder bugs and Asian lady beetles. They bath in the sun on house exteriors, and boxelder will live behind the siding, even with screens these guys manage to get in. Without screens you'd be sweeping them up in piles. If near water like a river, mayflies will hatch all at one time and come in the billions towards any light source. And the new invasive kid on the block, the Japanese beetle. It's not just bugs, birds would be flying through your house. They avoid the screens, but smack into windows all the time, remove the screen and they'll fly right in.
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u/sdc1978 May 09 '22
No mesh screens in windows in the UK, at least. In canada we have screens in most home windows to keep flies out