Abstract: An air circulator unit with adjustable size is provided including a housing situated within a window frame. The housing includes a pair of halves each defining an interior space, an open front face and an open rear face. The housing further includes a length adjuster having a pair of ends coupled between the halves of the housing with a plurality of bellows formed therebetween for allowing the movement of the halves along a single axis. At least one fan unit is mounted within the interior space of each of the halves for directing air between the open faces of the housing.