So, you have invested in some bat houses and now you want to start attracting bats into them rather than having them ruin the trees on your property. First of all, you should know that this is perhaps the single best way for you to give bats an alternative to your foliage and ensure that they are able to live in their environment peacefully, but before you pat yourself on the back you should try and be aware of the fact that placement matters a lot with bat boxes, and ascertaining the perfect location for the bat box you have purchased will be an important thing for you to look into.
You obviously need to put the bat box outside, but more than that the choice of what wall you want to put it on will be essential to think about. Try to find a wall that faces that location that the bats approach your home from. Most likely there will be a cave or woods that the bats live in permanently, exiting these locales only to hunt which is when they would need the boxes.
Once you have found a wall that faces these areas you can go on to place the bat box there and see the bats come all on their own. People often talk about lures and other chemicals that are supposed to attract bats but most of the time good placement is all you will ever need. These bat boxes are built to attract bats all on their own, although buying one with scented wood could help since bats will smell this and it will make it more likely that they will end up going for your bat box.