In my humble opinion, the ventilation is most useful if placed near the ceiling. That way, your little darlings won’t get drafts coming from below when they are up on their roosts. If some sleep on the floor, it’s not good for them either (Some of my elderly hens choose to sleep on the floor in the straw bedding). The drop in humidity is definitely a step in the right direction. My coops are draft free below with openings near the rafters. I hope you can find the right remedy for your own coop. Good Wishes!