Ventilation vs. Drafts: The Critical Line
A well-ventilated coop allows moisture, ammonia fumes, and excess heat to escape without creating a cold wind directly on the sleeping birds. A draft, conversely, is cold air blowing directly on a chicken, separating her feathers and making it impossible for her to stay warm.
The Golden Rule of Airflow
You need approximately 1 square foot of ventilation for every 10 square feet of coop floor space. This ventilation should ideally be placed high up on the coop walls, well above the chickens' heads when they are sleeping on their roosts.
Interior Layout Design
Placing your internal fixtures correctly prevents a multitude of behavioral and cleanliness issues:
Roosting Bars
- Placement: Roosts must be the highest point in the coop. Chickens naturally seek the highest spot to sleep to avoid predators.
- Spacing: If using multiple parallel bars, space them at least 15 inches apart so chickens don't poop on the birds sitting below them.
Nesting Boxes
- Placement: Keep nesting boxes lower than your roosting bars. If the boxes are higher, chickens will sleep in them, leading to poopy boxes and dirty eggs.
- Privacy: Place them in the darkest, quietest corner of the coop. They prefer a secluded spot to lay.
Winter Tip: Do not seal your coop completely shut in the winter! Moisture from their breath will build up, freeze, and cause frostbite on their combs. Keep high vents open year-round.
