Although increased air circulation reduces the stuffiness, it increases noise. Background noise has been found to cause damage to students' hearing or slow their learning process. Typical ranges of sound design levels are listed below. Whenever possible and as your budget allows, the sound level should be at the lower end of these ranges. With cooler conditions, however, even small localized air circulation may give rise to complaints of drafts.
Drafts generally reduce comfort and increase the thermostat, increasing energy costs.
Age It is useful to recognize that the human body is warm-blooded and that it must maintain a body temperature within very close limits. As the body produces heat continuously, it must also lose it at a rate that provides control of body temperature. Comfort may be regarded both physically and physiologically as a condition of thermal neutrality under which the body need not strain to reduce or increase heat loss. The body makes adjustments that influence these processes by increasing or decreasing the rate of heat loss as required. It is well-known that metabolic rate decreases with age.