Use circulation fans or tunnel ventilation where necessary. Use sprinklers, not fogger nozzles, because fog droplets will raise the relative humidity excessively. However, the evaporative cooling may be more expensive to build than drip or sprinkling, and not be any more effective. A two-summer Oklahoma study of farrowing sows showed there was no significant difference between cooling the sow with drippers and cooling the entire room with an evaporator pad. Cool weather strategy.
Cool weather presents a completely different thermal environment challenge.
Therefore the operator has to do a better job of managing the thermal environment in the building. An air speed of 30 feet per minute or less is recommended for nursery and growing pigs. Many confinement units have a couple of pens where one can measure air speeds at least 100 feet per minute in winter. Drafts lower feed efficiency through extra stress, extra feed energy requirement, and more health problems. Air quality can impact feed efficiency.