Bats are very common in New Jersey and do a great deal of good to control mosquitoes and gnats. In fact, they eat almost any night flying insect. Bats tend to congregate on the exterior of homes under the fascia boards along the roof, but will occasionally make their way inside and roost in the attic or chimney. Bats can carry rabies and their droppings can also transmit some bacterial and fungal diseases. Bats and their droppings should never be handled without proper protection.
Bats are a protected species and you may not harm them! Effective control of bats means they must be excluded from your home. Timing is critical and if they are excluded before all bats were properly removed then you run the risk of them ending up inside of your home!
Because they are protected, are carriers of disease and require specific timing to properly exclude they are best left to the pest professional to control.