Even though I still have arachnophobia, I've intentionally lived with spiders for over a decade and I've not had issues with mosquitoes even if I left all of my windows open. And my roommates are thriving!

They're very chill roommates, too! After about 1-2 months of adjusting to living together in my old apartment, they stopped spinning webs in the areas which I used frequently and focused on the zones which I left out for them - ceiling corners, gaps between walls and furniture, etc. I did occasionally clean up their old webs every now and again (while taking great care not to bother the spiders themselves) because they also gathered a lot of dust. But they'd replace the old webbing in a matter of days.

And they never developed overpopulation issues, even though I did see them producing egg sacks regularly. I was expecting to drown in spiders by the end of the first year of trying this arrangement, but I never counted more than 15-20 spiders apartment-wide.