Included in the area of energy for sustainability, this work intends to advance beyond the analysis of buildings' energy consumption, towards air quality experienced by its occupants. Departing from a practical case, Martim de Freitas School in Coimbra, the procedure is to measure parameters of indoor air quality in the sense of its proper evaluation. Contributing to the characterization of IAQ, a survey directed to the occupants is developed, in addition to measurements carried out within a classroom, during the heating season and the "pre-cooling" season. Subsequently it is held a...