box elder bugs in home

We have had these bugs in our home for a few years, not many, but enough to be annoying.
We live in northern IL.  Can we spray in the winter and have any effect on the population?  We see none inside but they seem to be in the aluminum siding and that would be impossible to seal up to find every crack they are accessing to get in the house.
What is a good plan to control them now?
Thanks, Steve

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