x2. MORE CARBON!!!!! When we moved last fall, it was less than ideal for their winter room - tiny tiny - they were almost roosting on each otherand refused to enter the frozen wasteland (outside) to scrounge around so when I started noticing some problems (mountains of poo and a not so pleasant smell
) I told my DH and his response was "Add more carbon. Duh." (He's a cattle guy) So off to the coop with arm fulls and rubbermaid tote fulls of hay the bulls deemed "too horrible to eat" and I'll be danged if it didn't work
Even this spring, when it thawed, the smell was almost non existent! Yay for carbon! (In this story - carbon refers to plants/vegetation that can absorb some of those negative effects of the chicken poo, while it decomposes, and turn it into something wonderful - compost! Not carbon the chemical element
)

Me, I take smells in the coop as an indicator I am doing something wrong. Hasn't failed me yet, my birds are all healthy.