This one looks like a Boxelder Bug (Boisea trivittata). It feeds primarily on the female boxelder tree (Acer negundo) and has the inconvenient habit of moving into houses to spend the winter. Fortunately, they do not damage while in the house but can become a nuisance when the move into our living spaces. The best control is to caulk the holes on the outside of the house.

This insect resembles the Large Milkweed Bug and the Small Milkweed Bug.