Why air temperature gradients matter
Temperature gradients occur when air is not moving sufficiently to keep rising hot air mixed with descending cool air, creating warmer temperatures at the ceiling and cooler temperatures at the floor, with temperature variations equal to about .75 degrees per foot of rise. This means there could be six degrees difference from the floor to an 8′ ceiling. In a 40 ft ceiling room, temperatures can vary 30 degrees or more. At a glance this seems to be a good thing. The floor of your facility, where people have to operate is cooler than the air pressed against the ceiling.