Just put a floor in the coop, temps going down down down

[trumpeting_angel]

Where I live, 1” gaps have to be covered with hardware cloth, to keep out weasels, snakes, and rats. I’m not sure what pests you might have out there. If you have 1 sq ft per bird when you add up the vents and leaks, you should be good to go! With a lot of shovelin’, as you so rightly point out!

 

[Alaskan]

I would think you need a great big 4 foot tall by whatever the width of that coop is vent. So big.

Just cover the vent/big window opening with hardware cloth so nothing climbs in and the chickens can't fly out.

But it looks to me like there is nowhere near enough ventilation.

 

[RenoHuskerDu]

Where I live, 1” gaps have to be covered with hardware cloth, to keep out weasels, snakes, and rats. I’m not sure what pests you might have out there. If you have 1 sq ft per bird when you add up the vents and leaks, you should be good to go! With a lot of shovelin’, as you so rightly point out!

Yep, there's cattle wire with hardware cloth over it. We have heeler/terrier crosses that hate rodents, we see very few signs and keep rat bait in coops. No weasels here, snake season is over.

All around the top it's open (cattle wire/hardware cloth), with some OSB on three sides. One long side open. Then gaps in paneling and a total of 5 leaky doors. They're ventilated. And it's windy here most of the time except fair weather.

The birds free range, I shoulda mentioned that.

 

[Alaskan]

One long side open.

Ah... didn't see that.

Then yep, they should have enough ventilation.

 

[Manhen]

Sounds good, since air coming up from the floor isn't good in the winter...

But since you said the poop doesn't tend to dry, and since you said a few have respiratory issues.....

Are you sure you have enough ventilation?

One huge wire wall would be great.

That's right, if it's not drying and your birds are sick that is it.

 

[aart]

Glad to see you have added a roof with a nice big overhang.

20's here too, but this: