Usually coughing when blowing on the air conditioner is due to the following factors: 1. For some allergy-prone patients, irritating allergies occur, for example, when the air conditioner is on, the air is relatively less circulated, so the dust mites or hair fiber material in the air will stimulate the patient’s respiratory tract and cause coughing to occur. 2. The cold air blown out of the air conditioner is relatively cool, so if there is a cough or a cough in patients with allergic asthma, the cough will occur. The air conditioner can often cause a cold, and coughing can occur when the cold is present. 4. If the air conditioner is not cleaned in time, it contains bacteria, viruses or dust mites, which can then induce the respiratory system and reflexively cause coughing.