There are more than a score of bat species, and all of them eat insects. Little Brown Bat and the Big Brown Bat. They also appear in southern states, but, more likely, the bats there will be the Mexican Free-Tailed Bat or the Pallid Bat. Still, your bat house may have inhabitants of other species. If they can nail thousands of insects a night, surely they can avoid a few humans.
Body temperature is very important to bats.
Sheltering from the wind is important, as is being free of branches and other obstructions. Once located, bat houses should not be touched. It takes some time for bat houses to become free of human scents, so don't expect immediate occupancy. That's another reason bat house are never painted or stained. Best time to hang your bat house is in the fall or winter, but anytime is a good time to get started since it may take awhile for human scents to be neutralized, and for the bats to make up their minds to roost.