Insects are quite difficult to identify from photographs, so I cannot offer an identification of your insect today. What I can tell you is that there is a common insect in Michigan that invades homes this time of year called the Box Elder Bug (Boisea trivittata). They are not harmful but sometimes they can invade home in large numbers. They can be removed by hand or with a vacuum cleaner. You can find more information and strategies for managing these kinds of nuisance pest in this article from MSU Extension: https://www.canr.msu.edu/news/why-are-all-these-bugs-appearing-on-the-side-or-inside-of-my-home