The Amcor ALD 12000M portable air conditioner is designed to fit most average-size rooms up to 400sq.ft. Manual controls are specifically recommended for use in Server rooms. In case of a power failure the unit will automatically restart when power resumes. This model also functions as a 65 pint dehumidifier. Self Evaporating Technology - During the cooling process water is extracted from the air into the unit. Most of this water is then recycled and used to cool the unit and make it run more efficiently. Approximately 65 to 70% of water condensed is evaporated out with the exhaust air reducing the hassle of emptying the water tank constantly. This unit has a built-in water tank (not removable) with a drain outlet and a water tube. When the tank fills the compressor stops operating and the power light will flash. This indicates that the tank should be emptied. Included with the unit is a window and a wall exhaust kit. AC must be vented via exhaust hose (included). Note: If your room has a heat source such as direct sunlight or computer servers the AC coverage area may be reduced.