This tendency of preferring certain thermal environments was already argued by McIntryre [14] In his studies, he found out that people of warm climates may prefer what they call a ‘‘slightly cool’’ environment and, on the contrary, people of cold climates may prefer what they call a ‘‘slightly warm’’ environment. Moreover, people in naturally ventilated indoor environment are comfortable within a range of microclimate values that is larger than in a fully conditioned indoor environment [5,6]. Recent field studies in classrooms confirmed the results