Abstract: A cover for an air conditioning unit or the like comprising an open box-like rectangular formed weather tight closure adapted to enclose an end of the said unit when installed in a wall opening such as a window, said closure having cooperating side and end wall portions forming a tunnel about the outer periphery thereof, at least one rigid member threaded through said tunnel, having wound ends projecting outwardly thereof, fastening means adapted to adjustably secure said wound ends together to substantially exert uniform tightening effect about the sides of the air conditioning unit to hold the closure snugly upon the outer periphery of the unit and to keep the conditioner closed thus preventing flow of air therethrough into the adjacent room and to protect the unit from the elements, such as rain, snow and wind.