Abstract: An electrically powered heater/cooler is coupled to a pair of air heat exchangers to warm one above ambient temperature and to cool the other below ambient. Input ducts to the heat exchangers are connected to a common duct attached to a fan supplying ambient air to both heat exchangers. The warm and cool air output ducts from the heat exchangers are connected to input ducts on opposing sides of a plenum which includes exit ducting on opposing sides. A vane assembly is movably supported within the plenum and is positioned to control the access of the cool and warm sides to the output ducts from the plenum. One output duct from the plenum connects a comfort conditioning air stream to ducting connected to a distributor mounted to direct the stream to the head and neck regioins of an indivudual. The other output duct connects rejected air to the ambient environment.