A window air conditioner includes an indoor housing, an outdoor housing, an air conditioning unit including a first unit for removing heat from indoors at the indoor housing, a second unit for releasing the heat to outdoors at the outdoor housing, and a power control panel provided at the indoor housing to control the first and second units; and a connecting rod extended between the indoor housing and the outdoor housing, wherein the connecting rod serves as a bridge for suspendedly hanging the air conditioning unit at the window frame at a position that the indoor housing is supported at an interior side of the window frame while the outdoor housing is supported at an exterior side of the window frame.