An air conditioner is provided that may include a main body having an air inlet and an air outlet； a filter received in the main body to filter air； a heat exchanger configured to allow heat exchange between a refrigerant and air suctioned into the main body； and a lamp module configured to radiate ultraviolet (UV) rays and infrared (IR) rays to the heat exchanger. The lamp module may include a porous main body, a plurality of UV lamps, and a plurality of IR lamps. The plurality of UV lamps and the plurality of IR lamps may be arranged in parallel on one surface of the porous main body at predetermined intervals.
