Ductless air conditioning has been used around the world for over 20 years, but it is relatively new in North America. If your home or business does not have a forced air system, the ductless air conditioner is the next best choice. They are typically much quieter than a window or wall type air conditioner, but do cost more. They are installed much like a central air conditioner with the evaporator indoors and the condensing unit outdoors. Both the indoor evaporator and the outdoor condenser a very quite.