Bat House

It depends on what types of bats live in your area I think. I had good luck with planting flowers that attract insects, because the bats will follow the insects (their food source). If you had a water source like a stream nearby, that would increase your chances immensely, though that's not really something easily controlled. I think starting a discussion in an interest is usually enough to attract people to it. I know a lot of times there will be people interested in something that just didn't think to add it when they were doing their interests. For example, I love bats, but would never have thought to add them here until now.

It depends on what kind of bats you want. I would hope you want fruit bats. It also depends on if there are any very near in your area. So I would use some kind of fruit that fruit bats like. Also, does the bat house tend to be dark during the day, have easy access, etc? Take care