"smoke pot, night light, and plugging the entry holes after sundown ..."

All good advice; in our case, we are building a house. The method of construction leaves enticing crevices that no self-respecting bat of wasp can resist. As we add the exterior trim and finish caulking we'll be all set. The screen flaps will allow bats to exit at night but not return. When we have any cash to spare we can add bat houses in the area.