An indoor unit of an air conditioner according to the present invention is for mounting a heater unit for heating more efficiently,; Indoor unit is provided with inlet and outlet; A blower mounted to the indoor unit; In the indoor unit of the air conditioner comprises a heater unit operated heater by an applied is attached to the indoor unit electric current, and characterized in that the heater unit is mounted on the blower, the heater is mounted for heating unit has the advantage that since the mounted inside the blower, as well as it is not necessary to secure an extra space for mounting the heater unit, the manufacturing costs and logistics costs for the production of the indoor unit by being the volume of the indoor unit proper reduction reduction have.
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