I have heard from a neighbor that if you play loud music in the attic about the time they enter for the night, they wll leave. Please do not kill them as they are very beneficial for eliminating mosquitoes. You might check with your local wildlife rescue for other remedies.
Bats won't roost in noisy places. You could wait until just before dusk--any sooner and the bats could fall prey to larger animals--and make some noise! Then definitely use screening material to close off their 'home'. Also, make sure they don't have any babies in your walls, or the smell with be terrible!
You could hire an exterminator. but if you choose to do it your self you have to find where the bats are entering and leaving your house. Bats come out at dusk. Once you have found their avenue of entrance and exit, the next step is in the evening when the bats have left their roosts is to close off these openings with the appropriate materials. I had a bat in my attic that was getting in through a small gap between the dyer vent and the outer wall. I used some screen material and reattached the vent.
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You may want to contact your local municipal government. They should be able to help you get rid of them. Remember bats are great, outside, they catch a lot of insects that cause you to itch. However, in the attic is not good. Their feces can cause breathing difficulties. Once you have them removed you will have to patch up the holes where they are getting in, or you'll just be doing it again. They can get in through a very tiny hole. But again, check with your local municipality to get local help. (08/04/2009)
I live on the water. I have bats in the attic. I love them. I love going out at dusk and dawn and watch them fly above all the trees. I may buy some bat houses and deter them from the attic. They are good for eating insects. (08/05/2009)
You don't chase them away. They may have rabies. Call animal control and tell them you have bats and they will either take care of your problem or at least tell you what to do. Good luck. (08/06/2009)
Thank you all. I have called my local animal control office and got some advice, among which was building a bat house or waiting for them to go out and seal up their entrances. (08/08/2009)
