Your first experience with an air conditioner may have been one of the old models that your parents jammed in a window each summer, but new air conditioning systems offer energy- efficient options that can cool just a single room, or your entire home.
Ductless air conditioning systems supply cold air directly to a room, while central (ducted) systems use your existing furnace ductwork. The system you choose will depend upon your budget, the square footage and layout of the area you wish to cool, your building design, and your heating system.