Abstract: The self contained, combined cooling and heating, air conditioning unit comprises a vertically elongated, generally rectangular cabinet adapted to be disposed in a vertically elongated, generally rectangular, relatively narrow opening formed in the exterior wall of an apartment building, small office building, townhouse or similar building wherein it is desired to have independent temperature control for the rooms and wherein the exterior building wall is, to a relatively large extent, glass or windows. A vertically disposed wall divides the interior of the cabinet into an inside compartment and an outside compartment which is in communication with the exterior of the building by means of an outside fresh air grille that extends substantially the entire vertical length of the outside facing end wall of the cabinet.