You are luck enough to have one of the best flying insect destroyers, but I realize you might not think it is all that great when they are flying around your family room. But just think how great it is when you are outside after dark and not getting eaten alive by the 'skeeters. What you do is just keep them where you want them--outside. Probably points of entry are chimney flues, holes in the eaves/soffitts. Put a screen guard over the chimney flues. Check your attic to be sure there are none there and caulk any openings. With wings folded, bats have little mass, so be sure you caulk every small opening. Bats love heat so they probably will not be in damp crawl spaces, basements, etc. If another one comes in, just close it in one room, if possible, then open all the doors and windows to the outside. It will probably leave on its own but if not you can kind of steer it toward the windows. You can tell them to come up our way. There are about 200 in the attic of the church next to our daughters house and they like it so well, we can't get any to roost in the bat house I built.