Coop Ventilation vs Draft in Winter – Frostbite Fix
Vent high, block low
Moisture from breath/droppings rises – needs 1 sq ft vent per 10 birds high under eaves, open year-round. Draft = wind at roost level – block with boards/tarp low, leave high open.
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Sealed coop = 80% humidity = frostbite at 20°F. Dry + ventilated = fine to 0°F. Measure with hygrometer – over 70%? Add high vent, remove wet bedding, fix spill.
No heat fixes wet air – see need heat?, pillar. External: UMN ventilation.