Bats are actually good for the environment as they can eat their entire body weight in insects, specifically mosquitoes. But if one is in your home.. you should proceed with caution:
"If you see a bat in your house, you should try and get the bat out of your house," said Joy O'Keefe, assistant professor of biology and director of Indiana State University's Center for Bat Research, Outreach and Conservation. "Whether that's calling an expert. If it's a single bat, you could try to scoop it into a bucket. You should only touch the bat if you're wearing very heavy duty gloves. None of the bats that occur here in Indiana can actually bite through a real heavy duty work glove."
Bats are quite popular this time of year in the area.. as they move from their summer to winter roosting sites.