The Brainy Yaks are in the process of building many bat houses. We have found that current bat houses not very efficient. We have changed the bat houses so that instead of chambers going up and down with the bats climbing over each other but ours have an angle so the bats hang off of it and can climb up the empty space to get to their area like a bat apartment with no walls. It should hold 30-50 bats. We have made a bathouse and working on testing. We have done some math with how many mosquitoes we can eliminate in a square mile with our bat house in that mile.