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Does the room have a return air vent? it's my experience that if the room is sealed off, it won't heat or cool properly without a return air vent. The air coming into the room has no where to go and it keeps more from flowing in through the vents unless you have a door open to the rest of the house, or a vent to pull air out of the room back to the HVAC unit.
\"There is only one basic human right, the right to do as you damn well please. And with it comes the only basic human duty, the duty to take the consequences.\" - P.J. O\'Rourke
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