Strictly speaking, an air conditioner is a kind of heat pump. It just goes one way -- cooling. Is a "heat pump" any different in how it cools air, or is it just acting as a regular air conditioner? I have no idea, but I tend to think it's pretty much the same thing.
Also, medwed, ducts and no ducts isn't a question of heat pump or furnace; it's just how it's laid out -- you might be thinking of a mini-split (a ductless, split air conditioner or heat pump).