“My uncles home is every late winter/spring. Its unbelievable. Plagues. Like the window scenes in Amityville Horror.”
Here in the northern Utah, each fall brings the pesky Box Elder Bug.
Mind you this infestation problem never occurred in western MD until about 20 years ago.
As for your boxelders, we have some, but the weirdest thing was years ago when we went looking for a new house. ONE house, only one, was INFESTED with them - all around outside of the front door. I have never seen that anywhere else, since, either.
Basically I like ladybugs, but when you go to my uncle’s and our neighboring 2nd house, you’ll get the willies. It’s bizarre.