I have the same thing going on at the place I just moved into. The first few days were a non-stop fly fest. The numbers have dropped considerably now though. I actually found I could get quite a few of them to leave of their own volition by opening a door on the sunny side of my house in the afternoon. They flew out toward the warmth/light.
I also picked up a Black&Decker dustbuster with an extended reach and power boost mode. Highly recommended for dealing with those fuckers indoors.
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