Oh, i had a problem like this very recently. The house has an air-vent that i assumed had a screen, but it was just flat out exposed. Because of the house design it just massively funneled the wind and mosquitos inside. I opened the vent cover and put some tissue paper over the inside so that it’d get fixed in place somewhat to “filter” the mosquitos and just instantly went from 5 per night to 1 over the next month.