Insulating your coop is a great idea as long as the chickens have adequate ventilation for getting rid of all the humidity dust carbon monoxide etc.
Chicken coop ventilation designs.
There are two different types of fans designed for coops.
If your coop has access to electricity installing fans is an excellent way to add ventilation to a chicken coop.
This is the space far above your birds heads.
Adding ventilation near the roof line in the form of vents drilled holes or small windows allows for this.
These coop plans help avoid predators giving your chickens a comfortable and cared for living environment.
The point of coop ventilation is to get all three of them out.
When looking at chicken coop designs or plans satisfy yourself that they include enough ventilation openings for your particular climate pattern and that these openings have an easy and efficient way of sealing off drafts during cold or bad weather.
To do that think of your coop as having three levels from top to bottom.
Carefully designed ventilation is included in all 15 coop designs to save your chickens from diseases and overheating.
If you would like some more information or ideas about keeping hens check out this article.