Do you have any pics of the 4'? I was hoping that would be enough space. I would like more info if you have it.
Well as it turns out there is such a thing as BAT BAIT!We do not use bat "BAIT" we are not even aware if there is such a thing, but who knows new discoveries are made everyday. However at this point to the best of our knowledge we are not aware of "bat bait". If you know of "bat bait" and can provide a link towards learning about this information please share. As we would like to research it further.
(liability disclosure)
Although we can not guarantee that you will get bats due to conditions at each location can be different,
we do include Instructions for our bat houses for the best success.
We recommend that people attract bats "The Old Fashioned Way".
It normally takes from 2 weeks to 1 year for bats to be attracted to your new bat house..
http://www.sunnysideupcoops.com/Bat-Houses.html