It is advantageous if you offer several boxes for bats to different sides of the house. Then, the animals can choose their quarters depending on tempeture change and neighborhood. But even just one box already offers more animals, often crowded next to each other, shelter. The boxes must be affixed or built into the facade. The bats should approach the boxes on a free way (no bushes on front of the entrance). It is essential to ensure that martens and cats can not reach the boxes. The boxes should be at least 13 feets above the ground. If you are unable to provide this high, the boxes should be fixed as high as possible. The entrance of bat boxes has a rough surface, so that the animals can crawl better. In addition, the box should have a bevel at the entrance or becompletely open from the bottom side, so that the droppings can fall off the boxes and does not seal the entrance! Round boxes, as a substitute for tree holes, must be cleaned, if necessary. The cleaning should be done once or twice a year. Cleaning should be done in April and / or September, so you don't disturb the animals during winter sleep or baby-time. Please make sure, that no animal will be pinched by opening or closing the boxes! Please refrain in the garden / balcony the use of pesticides.