First, sleep apnea patients wear machine treatment flow velocity in the respiratory tract than natural breathing fast, similar to ride in the speeding convertible on mouth breathing, so the air must pass through the artificial increase in temperature and humidity, in order to ensure the comfort of wearing machine, to ensure the therapeutic effect. Some people think that the south hot wet, do not need artificial warming humidification. In fact, now the air-conditioning penetration rate is very high, especially in the south, the indoor environment is not the original hot and humid. The temperature and humidity of nasal and airway mucosa of human on the air demand is much higher than the hands, face and other skin requirements. So the only artificial heating and humidifying can avoid caused by cold air caused by allergic rhinitis nasal obstruction, runny nose and discomfort to ensure efficacy.