Disclosed is a window type air conditioner, comprising a machine shell (110) and a fresh air shell (200), wherein the machine shell (110) comprises an indoor part (102) and an outdoor part (101); and the fresh air shell (200) is installed inside the machine shell (110). The fresh air shell (200) is configured to have a fresh air inlet (201) located in the outdoor part (101) and a fresh air outlet (202) located in the indoor part (102); a fresh air channel enabling the fresh air inlet (201) to be in communication with the fresh air outlet (202) is provided inside the fresh air shell (200); and the fresh air channel is suitable for feeding air in the outdoor environment into the indoor environment. The fresh air channel comprises an air intake section (230) corresponding to the fresh air inlet (201) and an air output section (240) corresponding to the fresh air outlet (202), and the ventilation cross section area of the air output section (240) is smaller than that of the air intake section (230).
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