Where Do Bats Roost?
Bats can roost in a variety of common places around your home. Usually, the more out of the way and quiet, the better. Bats, like most invading animals, do not like much interaction with people. Humans tend to cause disruption to the bats lifestyle so areas with the least (or no) human presence are places the bats like best to roost and reproduce.
A window with a torn or missing screen is an open invitation for bats to enter your home. Gaps in doors and vents will also be large enough for bats to get in