Air conditioner doesn't output air at the temperature it's set to. That would be very inefficient. It outputs air at a temperature well below that which it is set to and depends on advection - heat transfer through mixing - to get to the desired temperature. So if you stand near the vent of an air conditioner, chances are you're not only feeling cooler than you would at the same temperature the air conditioner is set to, the temperature is actually lower than the set point. The temperature variation exists because the rooms we air condition often have poor air circulation. If you stand directly in front of the vent, then of course you feel colder than the temperature setting, because it is colder.
Humidity effects also matter, because cooler air has a lower carrying capacity for water vapor. However, most air conditioning units don't include integral dehydration, so this effect is only really discernible in tropical regions where it is both hot and relative humidity is well above 50%. In addition, if standing directly in front of the vent, you will experience wind chill.
Stay smart with Feel Air Conditioning :)
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