If they're orangish in color (not to confuse them with the reddish lady bug) they're Asian Lady beetles. Over the past few years here in Michigan they have increased astronomically. Except last year there didn't seem to be too many of them. Usually when it starts to get cold in the fall we would see them all over the warm buildings........and they bite too but not bad.
I'm familiar with the Asian Lady Beetles because they appeared all over my son's college dorm in Minnesota. Apparently they prefer to land on light-colored buildings.