We had a couple try roosting last year in our attic area, they would get in the main part of our house through our basement, one must’ve tried drinking in our fish tank. I only knew this when my angel fish seemed sick. I cleaned the tank and found a few bat bones in a small cavity. My fish ate a bat.
After putting up a fiberglass screen along the wall in the only place they could get in for a few days, they went to another home and I put expanding foam up in a less than 1/2” gap between our chimney and soffit.
Today we have a few fly right over our heads right at dawn. Some neighbors obviously haven’t taken care of them.
Here’s a video of my extrusion, never saw them exit, but they obviously wanted back in.