Our house is almost 12 years old and in the last couple of years, we've had more and more issues with tiny little bugs, which I assume are gnats, sneaking through tiny gaps between the screen and the window frame.
Some of our screens needed repair so I took them to the hardware store and they replaced the fabric, but since putting the screens back up a few days ago, we've had nightmare amounts of these bugs getting in when we have the windows open. Happened again tonight; at least they are attracted to the light, so I can usually turn off all the lights in one room except one, and they will all migrate to the ceiling above that light. Then I get them with the vacuum cleaner.
D2 has been vacuuming bugs up from her ceiling on and off for over an hour now, even though we closed the windows and turned the AC back on (we really don't need it, but we just absolutely cannot keep the windows open anymore at night).
I've been waiting for what seems like forever for summer-like weather so I could open the house up, and now I'm shut in again because of these bugs.