I bug bombed the first apartment that I rented in Baton Rouge for fleas before I moved into it and killed hundreds of those Pametto bugs. I think they definitely infested that human habitation.
We have them here too, and they will get inside on occasion, though the house that I live in has never really been infested with them. I have noticed that their activity drops during the winter, when I never see them. --For the most part they live outside.
Did the house that you live in have any holes in the floor, or any way that they could get in through the roof? --I have noticed that they will set up residence under houses down here.