Bats have no interest in being around you, unless they want a drink from your swimming pool or other outdoor drinking area. These gentle creatures are very shy in the wild. Bats do bite and they carry rabies. So it is not a great idea to let them live in your attic. You can encourage them to move somewhere else.
Light up their night. If your attic has an electrical outlet, all the better. If not, run an extension cord upstairs to your attic and turn on floodlights or work lights, in an area away from flammable material. Or set up a battery-run lantern or two. Bats have to have a dark space, and lights drive them off.
Run a fan or two with or without the lights, as they cannot tolerate fast-moving air. The bats can be expected to depart in a couple of days.
Cut the legs off old pantyhose and add a handful of mothballs to the resulting bag, recommends NC State's Cooperative Extension. Suspend a dozen of these bags in the attic, especially near where the bats are entering.