Long-term use of air conditioning can easily lead to fever, mostly because of cold air when blowing cold air makes patients cold and fever, some patients can also be due to the large temperature difference between indoor and outdoor, also easy to lead to cold and fever. Long time in a closed air conditioning room, can be due to the presence of more viruses and bacteria in the air conditioning, resulting in respiratory infections and fever, especially Legionella infection formed Legionella pneumonia, can appear obvious chills, high fever phenomenon. In addition, it is not advisable to blow the air conditioner when you have a fever, because blowing the air conditioner when you have a fever is not conducive to the recovery of cold symptoms, and sometimes it can aggravate the itching and painful discomfort in the throat and aggravate the clinical symptoms of cough and phlegm. Some patients can form lower respiratory tract infections and aggravate the disease because the cold is not effectively controlled, so try to avoid staying in the air-conditioned room for a long time, and pay attention to the room temperature to avoid fever caused by blowing air conditioners.