First of all, don't try to kill the bats. There are laws against that. Second, bats produce lots of guano (droppings) which is unsanitary, and serves as a fertile breeding ground for a fungal disease called Histoplasmosis, which is transferable to humans who breathe in the fungal spores. Bats are also known to carry rabies, a viral disease that causes progressive paralysis and death in mammals, including humans.
They can also get into the house using spaces as small as 1/4" - 1/2". And a typical house will have lots of spaces that small, so plugging these up is a big job.
Finally, there's a period of time during which you can't get rid of the bats -- because they are raising their young. This is during the summer months. So if you have bats -- you'll have to wait till the end of August/beginning of September to try to get rid of them.
Good luck. Hire a professional that'll warrant their work for at least 5 years. Bats will spend years trying to return to their original home -- they are attracted there by the residual smell of their urine. Ugh!
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