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Before doing anything with the Bats you need to check with the Fish and Wildlife Commission in your State. Bats in most States are protected by the Govenment laws and you can be fined heavily for touching or trying to catch them.
You also need to be aware that Bats are heavy carriers of Rabies, so if you would be bitten by one you will need to be seen immediately by a Doctor and have that Bat caught for examination for Rabies.
Your best solution is to make contact with the State about the laws that govern the Bats. You can use this link to help with some information: http://www.npwrc.usgs.gov/resource/mammals/housebat/discuss.htm
I just want to make you aware of the legal issues that are involved with doing anything with the Bats. Fines can be quite high if they are federally protected. The best thing is to contact the Fresh Water Fish and Game Commision in your area and ask what can be done. They may even have someone come out and relocate them for you. The information I have given you is for your protection from illness and legal issues.
If my answer has been helpful please do not forget to rate me postively. I am a different Expert than who you have rated above for their answer.
I tried to give you all the documented information possible.
I am a different Expert than who you gave a poor rating. I gave you some information on who to contact about what can be done about the Bats, which would be your local Fresh Water, Fish and Game Commission. As I suggested they may have someone come out and relocate the Bats for you, or tell you what can be done to keep the Bats away from your property.. If you are not satisfiied with the Information I supplied, please Do Not Rate my answer, and I will opt out and see if I can get a Home Improvement Expert to assist you. I am also a Pet Expert and familiar with the laws governing wild animals.