The recommended location for a bat house is on a pole or building at least 15 feet high facing south or southeast to maximize sun exposure. Trees are not recommended due to the potential for predators and branches blocking the entrances.
Bats like warm environments, so the bat house should receive plenty of sunlight. The mounting height is key to protecting bats from predators. A location with at least 20 feet of open space around it allows bats to find and access the house without obstructions. A pole is the easiest way to mount a bat house in an open space. The side of a building is also an option if no other obstructions are nearby.