Often, people think that simply constructing a bat house will be enough to attract the desired bat population. This is not true; bats are actually extremely picky about where they choose to roost. Even if bat house conditions are perfect, there is no guarantee a bat will roost there.
Rural areas generally attract more bats than urban or suburban ones. Build bat houses in open areas away from roads and bright lights. Avoid locations that are heavily shaded or heavily forested.
The ideal habitat for a bat house is no more than 1/4 mile from the nearest source of water, particularly streams, rivers or ponds. Areas with diverse vegetation and plenty of insects can make great places for bat houses.
Bat houses should be put in areas where they will receive at least seven hours of morning and midday sun. In cooler climates, bat houses should be painted or stained a dark color to increase the interior temperature.
Bat houses should be mounted on poles or on the side of buildings, about 15 to 20 feet high. Avoid mounting bat houses on trees, as the leaves and branches may hinder flight and may prevent proper sun exposure.
Bats are extremely beneficial, and bat houses are a great way to encourage a bat population. A single bat may consume up to 3,000 insects in a single night.