A Portable Air Conditioner that you can roll from room to room might appeal to you if your window space is limited or if you live in a building where regular room air conditioners are prohibited.
Unlike common through-the-wall, window or central air conditioners, a portable air conditioner fits right where you need it - and you can move it to a different spot whenever you like. No installation or ducting is required (although some models do use a hose to exhaust water vapors from a built-in dehumidifier). You can use portable Air Conditioners virtually anywhere - bedrooms, family rooms, computer rooms, office, wine cellar, garage, attic, etc. Because a portable air conditioner can be operated independently of central systems, it is easier to target cooling specifically where you want it.
CoolRunningHS.com offers a wide variety of choices including Cooling Only models, Cooling with Heat or Heat Pump and for Hot Spot areas such as Server Rooms specially designed for that environment.