We went to Carlsbad 2 years ago, and got to stay for the emergence of the bats. It wasn't as impressive as Bracken Cave, but it was wonderful to watch. I found it interesting how many people, especially children, were fascinated by the bat activity.
If your house attacts a couple hundred bats from Carlsbad, they won't miss them....
We stayed in a motel on the north side of Carlsbad, and we saw bats flying under the street lights on both evenings we were there. Lots of bats in that area. Good luck with your new house!