My issue is humidity. The 16 X 20 insulated coop room is in a much larger pole shed and is divided into several pens for different groups. There are 30-40 well-feathered adult standard size birds in this coop room.
I am still seeing frost on the inside of windows.
Temps in the coop room have not gone below 24F, but it has only gotten down to about 13F outside. We will get down to -30F at some point this winter. The pole shed is often colder than outside air, as the concrete floor is shaded by the roof and does not warm up very quickly.
Incoming air vents come from inside the pole shed (about 2ft X 2 ft and can easily be made bigger) and out going is a 3 in bathroom fan that runs 30 min out of every hour. The specs on the fan state this should change the air in the coop room twice a day. When the fan is running you can feel a small amount of air flow coming in from the shed, but it isn't strong enough to feel like a draft. The coop smells fine and the air seems fairly dust free.
2 100-watt lights are on timers for 12 hours of light.
The eggs are not freezing, and the occassional bucket of water that gets left in a corner of the room does not even have a skim on it in the coldest mornings.
We try to clear poop out when we can, but do not have poop boards under every roost yet.
Floor in coop room is covered with a layer of cardboard and then 4 in of pine shavings.
Each pen has a heated gallon-sized dog dish for water or a 5-gallon poultry waterer with a red heat lamp on it. Each morning we carefully dump dirty water in a tub and take it out to the field to dump.
My soft-hearted (bless him!) DH has made me istall an additional red heat lamp that isn't even on a waterer. He is very worried about frostbite. We had some last year. He wants the temps above 32F at all times. We have a couple of birds who insist on sleeping on the floor.
I do not think all this heat is needed, I am more concerned about humidity. I also do not like how the heat lamps add a lot of light when the birds should be sleeping. It does allow the Buckeye rooster to hunt mice all night.
I'm planning to put thermocubes on the heat lamps. Anything else I can do to reassure him about reducing artificial heat in the coop room?