We have them by the thousands in the St.Louis area. We had them this winter also, they came into the house and were hard to find. When I washed all my curtains due to some construction work, we found them sleeping inside the folds of the curtains. I never squish them as the odor is disgusting. So far the only thing we know to do is keep the doors shut when possible. They are sneaky as they come in when the dogs do.