The Keystone 10,000 BTU slider/casement room air conditioner is perfect for cooling your rooms up to 450 sq. ft. Designed specifically for horizontal slider or casement windows this unit is the perfect solution for homes without traditional double-hung windows. 3 fan speeds and a 4-way air direction control means you can quickly cool your room or maintain comfort where needed. The unit also comes with built-in Dehumidification capabilities of removing 1.1 liters per hour. The slide-in/slide-out washable filter removes dust and odors, and with the built-in filter indicator, the unit will let you know when it's time to clean. Sleep mode keeps you cool and comfortable without keeping you awake. A programmable timer assures that you can have the unit cool during the hottest parts of the day and the energy-saver mode gives you peace of mind knowing your home is comfortable, without breaking the bank.