Bats can be frequent visitors in both old and new homes. They are small animals and are usually harmless. It’s not common for bats to cause much damage in the home. In fact, bats might go undetected for a long time, as they do not make much noise, might not smell much, and their droppings will usually crumble away to dust quickly. Since they don’t return to the house with insect prey or use any bedding, it’s normal for homeowners to be completely unaware of them.