A few of these used to live inside an electrical box or whatever on the side of my house. I don't know why they would've chosen that spot as their home since they usually burrow into wood to raise their young as the name suggests. Maybe there were wood parts inside the box? Or it was just convenient for them? Female carpenter bees only sting when they get bothered or caught and male carpenter bees can't sting at all, so they weren't bothersome there. If they had nested anywhere else though like in the wooden parts of the house that would've been a problem.