A washer comprising: a first heater to heat washing water; a second heater to heat air; a fan to guide air; a memory to store one or more programs; and a controller which is electrically connectable to the first heater, the second heater, the blower fan, and the memory. The washer is controlled by the controller to sequentially perform a washing cycle, a first rinsing cycle, a second rinsing cycle, a spin-drying cycle, and a drying cycle, wherein the second rinsing cycle includes an operation of heating the washing water through the first heater and an operation of rotating the drum, and the spin-drying cycle may include heating the air through the second heater in at least a part of a section based on a rotation speed of the drum, and guiding the heated air into the drum by using the blower fan.