I own a 2500 sqft home that is heated and cooled by a heat pump. All the rooms in the house are quite comfortable with the exception of one room that is supplied by an 8" round duct 18 feet from the trunkline. The room also has an 8" return to the heatpump. Problem is that this room does not seem to be receiving the velocity of air needed to heat and cool the room properly. I suspect that the 8" supply might be to big and is cutting down on velocity of air to the room. Would running a 6" duct in its place add more airflow to the room?
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