Here's what you do. Go outside in the evening and look up where the bugs are congregating around a light. If you see bats, you already have some and they have a home. and apparently don't care about finding a new one. My houses have been empty for years but we have bats galore. That is not Pussy Galores sister. If you don't see any, they aren't there and will probably never get to see the bat house unless a bat realtor brings them around to show it. So you will want to get it listed as soon as possible.