In natural ventilated buildings, the usual controls available to occupants are doors, openable windows, blinds and curtains, fans, central heating, electric or gas heaters and hot air blowers. The most important means of controlling the indoor environment are windows [87].
If the conditions inside the buildings do not fulfill the occupants' satisfaction, people behave in ways with a tendency to restore their comfort. This principle implies that they will do corrective actions, including the use of building controls which they think will enhance their tranquillity. In temperate climates the most popular way to take corrective actions are windows in any building. It is not only beneficial for saving energy in the summer by decreasing the demand for mechanical cooling or heating, but also provides a beneficial interaction between the indoor and outdoor environments [12].