A couple of years ago in the fall, we started having this problem with flies in our house. It had gotten cold outside and they all wanted to come in where it was warm.
There’s this certain light in the foyer that for some reason they liked to swarm around.
We tried swatting them but they came back. Every day there would be more and more.
My competitive alpha male lizard brain kicked in. So I got my Shop Vac …