An air blower enables cold-air dehumidification by removing moisture in summer, can supply instantaneous hot air when the room temperature temporarily goes down, enables hot-air humidification by supplying moisture in winter, enables a four-season use by using an additional humidification function in spring and fall, controls room temperature and room humidity by providing an indoor temperature/humidity sensor and a water temperature sensor, saves energy by intelligently operating and stopping all the functions, provides warning signs through lamps for indicating supply or discharge or lack of water with a high/low water level gauge of a water tank and a high water level gauge of a water tank for dehumidification, prevents safety accidents such as damage or conflagration and the like of components related to a fan driving motor by providing a fan driving motor overheating prevention sensor, prevents the leakage of water when a main body falls down.