Humidity has an effect for sure, but everyone is missing the elephant in the room.
By far the largest effect is that the air coming from the A/C must be much colder than the current room temperature to have a noticeable cooling effect. If you want all the air in the room to get to 70F, a 65F exhaust just isn’t gonna cut it unless you want the A/C to be running constantly. It’s gotta be more like 50F, and a 50F wind is sure gonna feel different from 70F still air.
Try putting a thermometer directly in front of an A/C vent and it will become obvious very quickly.
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