We’ve got them here in Southern Indiana too.
By the Gazillions!
Very annoying, but typically we’re only infested indoors for a week or two in both Fall and Spring.
The pregnant females can get in and hibernate over the winter in any crack they can find. Then, in February or so (depends on the Sun angle, again), they crawl out by the hundreds looking for a way outside.
I had them crawling out of floor cracks and from behind molding....like something out of a horror film. They would form these “warming balls” behind furniture on southern exposure walls. I have had an exterminator for three years now and typically only see 20 or less in any given late Spring. His treatment will kill them when they contact it inside or outside, plus they will track the poison to the hiding spots where there are many of them. He says they are an *invasion* as opposed to an *infestation*, because they don’t breed indoors, just hibernate.
I hate them!