Children with a fever of 39.5 ℃ if the room temperature is high, you can turn on the air conditioning, which will help dissipate the heat; however, if the room temperature is low it is not recommended to turn on the air conditioning. Children with a fever of 39.5 ℃, according to the temperature scale 39.0-40.9 ℃ for high fever, easy to induce febrile convulsions, the need for timely antipyretic. If the room temperature is high, open the air conditioning is an effective means of physical cooling, control the ambient temperature at 24-26 ℃, can effectively reduce the ambient temperature, conducive to the baby’s heat dissipation. However, be careful not to blow the air conditioning vents directly at the child, and not for a long time blowing air conditioning, so as not to cause environmental dryness, resulting in nasal bleeding and other situations. The purpose of turning on the air conditioner is to lower the room temperature and increase air circulation to facilitate heat dissipation. If the room temperature is low, it is not recommended to turn on the air conditioner to avoid aggravating the condition. In addition, it is necessary to combine other means of fever reduction, such as reducing clothing, covers, adequate hydration and other physical methods to reduce temperature; use ibuprofen or acetaminophen as prescribed by a doctor, acetaminophen for children ≥ 3 months of age, and also ibuprofen for children ≥ 6 months of age. All of the above medications should be used under doctor’s supervision and avoid self-medication. There are a variety of illnesses that can cause high fever in children, so it is recommended that you seek medical attention to identify the cause of the illness and then treat it aggressively.