said by Johkal:Check all around the window for small openings where they may have built a nest in the walls.
Not that it matters, but "Yellow Jackets" aren't wasps. They normally live in the ground. You have wasps.
You are misinformed :P yellow Jackets are indeed wasps
We once had a yellow jacket nest in our bathroom wall. We didnt know what this strange sound was we could here and my dad was like I think something is in the wall. His bright idea was to make a hole in the wall with a hammer... I guess you can tell what happened next lol we all ran from the bathroom and closed the door thinking that would stop them
But every once in a while we would find a couple in the room never seeing any outside so like the others here have said, maybe its in the walls