Points out that the heating, cooling and ventilation functions of a building often share the same equipment and air distribution system. Further, occupant acceptance of both the thermal environment and perceived air quality are affected by the common environmental parameters of temperature, humidity and air motion. States this suggests that improving the thermal environment for comfort considerations would also improve acceptability of ventilation and air quality related perceptions. Design and operation can make use of the complementary nature of thermal and ventilation functions to facilitate a more optimal operation of both. Cites and summarises previous laboratory and field observations that support the premise of interactions between thermal and air quality perceptions and complaints.KEYWORDS: Thermal comfort, ventilation, cooling, heating, space heating, designing, indoor, air quality, air flow, operations.