How should a broiler house be ventilated in a hot climate?

In a hot climate, broiler-house ventilation must move air across the birds while replacing hot, humid air with fresh air. Breed management guides distinguish heat removal from moisture and gas removal: all matter, but cooling becomes the main constraint in hot weather. Judge performance by airflow where birds stand, temperature, humidity and flock behaviour—not house volume or fan capacity alone.

For an open-sided house, FAO tropical poultry guidance and extension practice recommend managing curtains for cross-flow and adding circulation fans where natural wind leaves still areas. Circulation fans help move air over birds but do not replace fresh-air exchange. Provide shade, insulate or whitewash the roof to reduce radiant heat, and keep drinkers shaded and flushed so water stays cool and plentiful. High humidity limits evaporative cooling, so do not rely on misting that leaves the house or litter wetter.

In a naturally ventilated Caribbean curtain house at 31C, for instance, the example flock of 3,000 Cobb 500 broilers occupies 250 m2 at 12 birds/m2. FAO and breed-guide heat-stress guidance identifies roughly 30C as a point above which intake and growth decline, with problems beginning earlier in high humidity. The example’s realistic FCR is 1.7 rather than the standard 1.57; better airflow can help, but cannot guarantee standard performance. Reduce hot-season stocking if the house cannot keep heavy birds comfortable, shift main feeding to early morning and late evening, and avoid handling during peak heat.

Tunnel ventilation can deliver more consistent bird-level air speed, but fans and inlets must be designed together for the flock and local climate. FAO and development-bank investment appraisal practice recommends comparing the added margin with capital, electricity, financing and backup-power costs. Reliable standby power is essential for mechanically dependent housing. For young chicks, follow age-specific brooding guidance rather than directing the strong cooling airflow needed by heavy birds onto them.