I had two that got in a couple years ago, think it was through a broken attic window then through a hole somebody stepped through in the ceiling, not sure. It is said they can get through very small cracks.

Years ago I killed one and the sound of its crying I remember to this day, so I had to figure out how to capture them alive. The cat alerted me to its whereabouts; it was flying through the house late at night; I even stepped on it accidentally but didn't hurt it and did not get bitten.

The upshot of it is that at night these seem to land on the floor in an open area if you don't get them too spooked. I threw a large white plastic bucket over it and put a weight on top until morning. Then I gently put a square rubbermaid plastic cannister over it and carefully slid the plastic lid under it and sealed it shut, took a photo of it.

You do not want to leave the lid sealed too long or it will run out of air, so crack it open if you can't release it right away.

I took them out (two different times) in different woodsy/creek areas pretty far from my house and let them go because I was afraid they would just get back in the house if I didn't.

My house is very open with stuff around, so it shouldn't be much worse than a basement unless they get up in the rafters which would make things more difficult.

If you can't solve the problem yourself, call the animal control people and ask them what to do.

I don't really want to scare anyone but we recently had a teen die from a rabid bat that flew into his bedroom one night. It was a big shock. You can read the stories by googling "bat death houston".

PLEASE BE CAREFUL!