If you have a cold, it’s best not to turn on the air conditioner. Turning on the air conditioner will make the indoor air too dry, and when the air is dry, it will increase the chances of respiratory infections and aggravate the symptoms of respiratory infections caused by colds, which can lead to sore throat or coughing and phlegm, so you should not turn on the air conditioner during a cold. When you turn on the air conditioner, it is easy to get cold, which will aggravate the symptoms of cold or trigger the symptoms of heavy feeling. Air conditioning cleaning is not very timely, it is easy to breed bacteria, mold or viruses, will aggravate the symptoms of cold, or induce respiratory infections. Therefore, it is best not to turn on the air conditioner during a cold, rest more, drink more water, and eat more fresh fruits and vegetables rich in vitamin C, which can promote the recovery of colds. Cold and flu symptoms, if more serious, should also be treated with cold and flu medicines, such as aminophenol pseudoephedrine dispersible tablets.