[champion6]

Originally Posted by villagetinker

When the recent cold wave hit, we had 2 wasps in the bathrooms, so did my neighbor. He mentioned he noticed a nest INSIDE the vent in the sofit. It appears the screen that is installed is fairly course and allows wasps to get inside, and then into the house.
Our solution:
Remove the outside vent cover, install some regular window screen and replace the outside cover. The much finer window screen will prevent wasps and probably most other insects from getting inside. It took me about 15 minutes to do all 3 vents in our house.
It appears there may be a variety of covers, so you may need to get new covers, or you may be lucky like me and be able to just remove 2 screws to get the cover off, install the new screen, and screw the cover back on.

I had the same problem and solved it the same way.