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Keeping poultry houses cool during hot weather requires more than lowering air temperature. Relative humidity and air movement also affect how effectively birds release body heat.

Evaporative cooling pads cool incoming air as ventilation fans draw it through wetted pads. They are widely used in mechanically ventilated poultry houses and can provide substantial cooling when properly sized and maintained. However, evaporation also increases indoor humidity, which may limit further cooling in humid weather.

High-pressure fogging systems release fine water droplets into the air. When droplets evaporate before reaching birds or litter, they absorb heat from the surrounding air. Fogging may be useful as a supplementary option during very hot, relatively dry conditions—for example, when outdoor temperatures exceed 35°C and relative humidity is below 70%. These figures are practical reference points, not universal operating thresholds.

Water use depends on nozzle flow rate, operating time, ventilation, and system design. Pad systems commonly recirculate water, while fogging systems use water according to nozzle output and control settings. Neither method has a universally lower water demand in every installation.

For safer operation, use temperature and humidity readings to control fogging intervals. A short initial cycle, such as one lasting up to three minutes, may be tested where appropriate, followed by reassessment before another cycle. Stop or reduce fogging if humidity rises excessively or litter and equipment become wet. The exact interval should follow system specifications and on-site conditions.

For most commercial poultry houses, cooling pads and tunnel ventilation provide the main cooling foundation. Fogging should be added only when climate conditions, airflow, and moisture management support its use.