Quote Originally Posted by def90 View Post
can you put some sort of flap over the holes that would allow them to squeeze their way out and exit but not get back in? But yeah, those holes are plenty big for bats.
I have thought of that as well.

The problem is that there are many holes. I would need to make a lot of little flaps. I was thinking of possibly taping cardboard up there so they can only come out and not get back in but I don't know if they would chew their way through.

Or I could make one and fill the rest with spray foam, hoping that they all lead to one chamber. I still haven't done anything except install a 100w bulb.

Who knows? That may be enough to keep them from coming back.