I'll go on record as a "pro-bat box" vote. Ours attached to our house gets activity sometimes and we notice fewer mosquitoes when they are around. They are looking for a home. Give them one. You don't have to, and they'll look around openings in your roof (attic), children's play equipment...etc.
Full disclosure, you will have bat poop under the bat house - so plant vegetation in front of it to block it.
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