Air handling unit for a room, in particular a computer room, comprising: - a first damper to connect an air intake duct outside the room and an air injection duct inside the room; - a second damper to connect a duct for removing air from the room and an air injection duct inside the room; - means for opening and closing first and second dampers to regulate the proportions in a mixture of outside air, collected from the open air, and air removed from the room, the air to be injected into the room comprising: • only air removed from the room when the temperature of the outside air, T ext, is above a predefined temperature setpoint for removing air from the room, T rep; • outside air mixed with air removed from the room when the temperature of the outside air, T ext, is, firstly, below the predefined temperature setpoint for removing air from the room, T rep, and, secondly, below an air movement temperature setpoint, T p; the proportion of outside air and air removed from the room giving the air mixture the air movement temperature setpoint, T p; and • only outside air when the temperature of the outside air, T ext, is, firstly, below the temperature setpoint for removing air from the room, T rep, and, secondly, above the air movement temperature setpoint, T p; - means for cooling the air to be injected into the room, only when the temperature of the outside air, T ext, is above the air movement temperature setpoint, T p; - means for extracting air in order to reject to the outside the fraction of the room's air that is not recirculated; - means for rejecting the heat generated by the means for cooling the air to be injected via the air evacuated to the outside; - air movement means for injecting the air to be injected into the inside of the room; and - means for controlling the humidity of the air injected into the room. - a first damper to connect an air intake duct outside the room and an air injection duct inside the room; - a second damper to connect a duct for removing air from the room and an air injection duct inside the room; - means for opening and closing first and second dampers to regulate the proportions in a mixture of outside air, collected from the open air, and air removed from the room, the air to be injected into the room comprising: • only air removed from the room when the temperature of the outside air, T ext, is above a predefined temperature setpoint for removing air from the room, T rep; • outside air mixed with air removed from the room when the temperature of the outside air, T ext, is, firstly, below the predefined temperature setpoint for removing air from the room, T rep, and, secondly, below an air movement temperature setpoint, T p; the proportion of outside air and air removed from the room giving the air mixture the air movement temperature setpoint, T p; and • only outside air when the temperature of the outside air, T ext, is, firstly, below the temperature setpoint for removing air from the room, T rep, and, secondly, above the air movement temperature setpoint, T p; • only air removed from the room when the temperature of the outside air, T ext, is above a predefined temperature setpoint for removing air from the room, T rep; • outside air mixed with air removed from the room when the temperature of the outside air, T ext, is, firstly, below the predefined temperature setpoint for removing air from the room, T rep, and, secondly, below an air movement temperature setpoint, T p; the proportion of outside air and air removed from the room giving the air mixture the air movement temperature setpoint, T p; and • only outside air when the temperature of the outside air, T ext, is, firstly, below the temperature setpoint for removing air from the room, T rep, and, secondly, above the air movement temperature setpoint, T p; - means for cooling the air to be injected into the room, only when the temperature of the outside air, T ext, is above the air movement temperature setpoint, T p; - means for extracting air in order to reject to the outside the fraction of the room's air that is not recirculated; - means for rejecting the heat generated by the means for cooling the air to be injected via the air evacuated to the outside; - air movement means for injecting the air to be injected into the inside of the room; and - means for controlling the humidity of the air injected into the room.