Blowing air conditioning is easy to trigger a cough, whether it is cooling or heating, air conditioning to adjust the indoor temperature needs to use air circulation to achieve, at this time because the wind constantly blowing in the room, it is easy to some objects above the dust, the house of some not so good substances, such as electrostatic generation of electrostatic ions with dust mites constantly flying in the room, circulation, patients with asthma inhalation of dust mites lead to cough or even The coughing and even shortness of breath can be caused by inhaling dust mites. In addition, cold air entering the airway can easily stimulate the nerve endings in the airway and cause coughing.