The air ducts are only one part of the AC system that the air you breathe passes through. The air from your rooms is drawn into the AC system, passes through the blower fan, is drawn across the cooling coils, and only then is forced out through the duct system and back into the rooms.
Cleaner air, but one advantage of the so-called "air duct cleaning" is a significant advantage of a fresh AC system that it increases the body's energy efficiency. The biggest area of concern is that the cooling system, or evaporator, coil.
These are all coils that you do not see, which are in the attic or where the main part of the AC system appears. The coils that you see outside your residence that the condenser coils are different. The environment of your home never works on these coals.
It is known as a partitioning system and functions in this way. The atmosphere in your home is ready for the AC system, passing over the evaporator coil with a chill mist flowing through it. Air is cooled as it crosses the coil, along with additional moisture from the atmosphere's humidity on the coil, enjoying the humidity on your toilet condition on a relatively cold mirror as you're bathing.
Humidity and heat have been removed at the same time, thus "conditioning" the atmosphere in your property. The heat is absorbed from the coil by refrigerant and also flows through the tube in your external unit, the condenser.
This refrigerant is "condensed" with a pump and the heat is felt, squeezed by this refrigerant, and largely blown away by the air. When you notice that the fan running in the condenser unit if you set your hand inside the device, you will feel that the heat being dismissed from your home is gone.