The HVLS story: In 1998, dairy farmers were looking for a way to cool their cows to reduce heat stress. Air conditioning was too expensive and it was impossible to run the ductwork in the barns. Small barn fans helped, but didn’t cover a wide enough area, consumed excessive and costly energy, and required ongoing maintenance. The engineers at Mechanization Systems Company (now known as MacroAir) created a huge fan with blades spanning 24’ instead of the typical 2’. And to create a gentle breeze, the fan speed was a fraction of the speed of small fans.





