What is the optimal humidity level in a brown layer shed during different seasons?

Humidity is a vital but often ignored variable in poultry house thermodynamics. During hot weather, hens rely on evaporative cooling (panting) to lose body heat. If the relative humidity in the house is above 70%, the air is saturated with water vapor, preventing the moisture on the hen's lungs from evaporating. This failure triggers rapid core temperature spikes and acute heat exhaustion. In winter, cold and highly humid air (above 80%) leads to wet litter, which accelerates ammonia gas production and fecal-staining on brown eggshells. Managing humidity requires synchronized fan and pad ventilation. Farmers can calculate psychrometric charts in the Poultry Encyclopedia, buy high-pressure fogging pumps and controllers on Poultry Plaza, track daily egg rates on Poultry Rates, and trade clean nest eggs on Murghi Mandi.