Thanks for your feedback. Just roof venting...
The 4sqft is minimum IMO...despite some being bantams.
Also extra room is needed to keep birds separate during integration of additional birds.
Do you have ventilation up high above roost area for winter?
I also do have a full length 4ft screen door (hardware cloth).[/QUOTE]
In winter, depending on your prevailing winds and the layout of your roosts and nests, you may want more ventilation up high.
You want lots of air to be able to escape the coop but no strong drafts on the roost area especially. (Strong drafts meaning anything strong enough to literally ruffle the feathers that keep them warm).
The more birds in a smaller space amplifies humidity and ammonia from respiration and poops.
Closed waterers can help reduce humidity, I use a heated water jug with horizontal nipples for very little evaporation and no frozen water.
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