Upgrade to the NewAir 10000E, which is over $100 less with more BTU!A dual hose system and self-evaporating technologies are featured with the new Sunpentown WA-9040DH portable air conditioner and heater. This 9,000 Btu four-in-one system provides multi-season comfort, and is designed to efficiently cool or warm and dehumidify spaces without permanent installation! The WA-9040DH portable A/C effectively improves air circulation in poorly ventilated spaces with its dual hose system. With one hose for air intake and the other for air exhaust, there is no negative pressure created inside the room. Self-Evaporating Technology: During the cooling process, water is extracted from the air into the unit. Most of this water is recycled and used to refresh the cooling coils inside the WA-9040DH, creating improved cooling efficiency without adding energy cost! The moisture is then pushed out with the exhaust air, leaving you a virtually no-drain unit. In extremely humid conditions, if condensation collects faster than the unit can evaporate, the excess water will collect in the built in tank. When the tank is full, the compressor will automatically shut off and the unit will indicate that drainage is needed. Auto-Restart Function: This is a great choice for server room cooling, because the Sunpentown WA-9040DH portable air conditioner can be moved wherever supplemental cooling is needed. Whether your standard central air is just not keeping the temperature cool enough for your electronics, or you need cooling at night and over the weekend when air conditioning is not available, this unit can help! The automatic restart function of the WA-9040DH is especially important for server room usage, because that means that it will resume operation as soon as power is restored without manually resetting the controls. Note: Exhaust hose installation is required for the Sunpentown WA-9040DH portable air conditioner (all standard accessories included). The plastic slider kit forms extend to a maximum length of 6′ 9″.