Looking into getting a bat house from you.
I don't know much about this, so I need to know if the house needs to be mounted in such a way that it can be lowered or otherwise accessed for cleaning (like a marin house), or will the bats do their own maintenance?
Actually no maintenance is needed. Our houses are designed so that the bat guano will drop out of the house by default and not accumulate inside.
Bat Houses: http://www.bats-house.com/bat-houses
And more information about how to mount them can be seen here:
Bat House Mounting: http://www.bats-house.com/bat-house-mounting-guidelines