When you turn on the air conditioner and your nose is dry, you should increase the indoor humidity, rinse the nasal cavity, reduce the air conditioner wind speed, and use medication inside the nose. 1. Increase indoor humidity: Turning on the air conditioner will reduce the water molecules in the air, making the room dry, and the nose will feel dry when breathing. You can use a humidifier indoors or sprinkle some water on the floor to increase indoor humidity, which can relieve the dryness of the nose. 2. Rinse the nose: You can use saline to rinse the nasal cavity to keep the nasal cavity moist, to reduce the dryness of the nose. 3. Reduce air-conditioning wind speed: Reducing air-conditioning wind speed can reduce the loss of water molecules in the air. 4. Intranasal medication: you can use some moisturizing effect of nasal drops under the guidance of a doctor, or with the nasal cavity has a lubricating effect of cod liver oil, etc., to relieve the dryness of the nose. If there is no significant improvement in the symptoms, it is recommended to consult a doctor in time to investigate nasal diseases and standardize the treatment.