I contacted Massey Services when I had a colony of bats in the attic. They are removed by building a one way "door" that allows them to leave at night and hunt but they can't get back in when they return. They move on and establish a colony in another location. This stays up for 2-3 days before Massey goes into the attic to make sure the entire colony is gone, clean up the guano, remove the "door" and seal the hole.
If you are interested in bat a house, I suggest that you put it up a few days before you evict them from your house. If you get outside your home about 30 minutes before sunrise, you might be able to see them enter before you call a pest control company. After the "door" is installed you might be able to see which one of your neighbor's homes they pick to relocate the colony.
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