The simple and straightforward answer to this question is: No, bats don't chew on wires. Bats aren't rodents and they don't chew on wires, wood or insulation. Bats will maybe scratch insulation when they go inside and outside the attic where they spend time during the day, but they will not chew on it to make bedding or a nest.
Bats don't enter human homes unless they create a colony there for hibernation or for nursing. It was previously believed that bats hibernate in caves, but it has been proven that attics of houses and other buildings are an appropriate area for their winter hibernation period.
Bats will live in your attic when they need to bring up their babies. Babies are not capable to fly or to hunt for a few months, usually in the summer and early fall. During this period it is not good to exclude bats from your home. Try to be patient and let them be during late fall and then exclude them so that they don't use your home as theirs.
As already mentioned, bats don't chew on wiring, so you can rest assured that there will be no short circuits or energy breakdowns because of bats. The only concern with bats living in your attic is the large quantity of bat feces that accumulates over a period of time. Bat feces are corrosive and will damage your house’s construction, both the wooden and metal parts of it. In this sense, it is indeed important to get the bats out from your home because bat feces are dangerous for both your home and for your health. Bat feces can contain fungi that cause a lung disease with sometimes serious consequences.
Bats aren't aggressive and they will never attack you or your pets. They don't go after people or animals to hurt them and they will only try to bite you in self-defense when you try to catch them. In order to get the bats out of your home and to prevent structural damage to it, it is necessary to create a one-way exclusion funnel that will enable bats to get outside but disable them from getting back in. Bats don't all go outside in the evening; some will remain inside while others go out to hunt. This is the reason why you should leave this exclusion tool on for some time, to be sure that all the bats are outside. Only then, when you have made sure that all the bats have left your house, is it safe to close all the entry points.
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