Make sure your gable vents have a stout screen behind them. My neighbors had a bat infested attic because they got in via the gable vents.
After a few passes and some poor flying he flopped on a rock by the pool and died.
I called Pima County animal control and they came pretty quickly, got it and tested it for rabies. It was rabid, but since we didn't touch it and the pool chlorine level was OK, no problems for us....:^)
It was strange to see a bat out flying at noon though.