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Keeping poultry houses within a suitable temperature range during summer is an important part of environmental management. A combination of evaporative cooling pads and exhaust fans is widely used because the two systems work together to move and cool incoming air.
The process begins with the exhaust fans. By removing hot air from the house, they create negative pressure that draws outdoor air through the wetted cooling pads. As the air passes across the wet pad surface, part of the water evaporates. The energy required for evaporation is taken from the air, reducing its dry-bulb temperature before it enters the poultry house.
The actual temperature reduction is not a fixed value. Cooling performance depends strongly on outdoor relative humidity. Dry air generally has greater evaporation potential, while high humidity limits further evaporation. Air velocity, pad condition, water distribution, fan capacity, house sealing, and inlet design also affect the final result.
Under suitable hot and relatively dry conditions, a well-designed evaporative cooling system may produce a substantial temperature reduction. However, achieving a specific reduction such as 5–8°C should be treated as a site-specific result rather than a universal guarantee.
For poultry farms, effective cooling therefore depends on the entire system: properly sized fans, clean and evenly wetted pads, adequate airflow, good house sealing, and appropriate environmental control. Regular maintenance is essential for maintaining stable cooling performance throughout the summer.
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