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All buildings produce internal heat. All buildings are affected by external loads (heating or cooling) based on the climate and internal loads (heat from equipment, lights, people, etc.). Large commercial buildings tend to be internally dominated. Residences or small commercial buildings tend to be the exact opposite.
The comfort zone may be roughly defined as follows: Most people in the temperate zone, sitting indoors in the shade in light clothing, will feel tolerably comfortable at temperatures ranging from 70 to 80 F as long as the relative humidity lies between 20% and 50%. As humidity increases, they will begin to become uncomfortable at lower and lower temperatures until the relative humidity reaches 75% to 80%, when discomfort at any temperature sets in. But if they are sitting in a draft, the range of tolerable temperature shifts upward, so that temperatures of 85 F may be quite comfortable in the 20% to 50% relative humidity range, if local air is moving at 200 ft/min. Indoor air moving more slowly than 50 ft/min is generally unnoticed, while flows of 50 to 100 ft/min are pleasant and hardly noticed. Breezes from 100 to 200 ft/min are pleasant but one is constantly aware of them, while those from 200 to 300 ft/min
