Do HVLS fans cool your space down? NO.
Fans actually add heat to a room. One way to think about it is like this: If you have a perfectly insulated room and you put an electric fan in it, then the room temperature will go up.
Why is that? –All the electricity that is driving the fan turns directly into heat.
So a fan does not cool the room at all, HVLS fan does not, either. What a fan does is create a wind chill effect.
When people talk about wind chill on a cold winter day, what they are referring to is how the wind increases convective heat loss. By blowing air around, the fan makes it easier for the air to evaporate sweat from your skin, which is how you eliminate body heat. The more evaporation, the cooler you feel.
Yes, evaporation brings heat away. HVLS fan does not cool your space down, EVAPORATIVE AIR COOLER DOES. How if we combine air cooler with HVLS fan? This is what RTFANS do today for large space ventilation, we call it a “Fan and cooler combo” system.