Finding that your air conditioning system is blowing strong air out of certain supply registers while other vents produce little to no airflow is typically caused by duct balancing issues, disconnected runs, or closed dampers. During original HVAC installation, balancing dampers are adjusted to regulate airflow, but over time, linkages can slip or residents may close dampers manually. Furthermore, if a flexible duct branch has become completely disconnected or crushed in the attic or crawlspace, air will vent into the unconditioned space instead of reaching the room. You can troubleshoot by walking through your home to map active vents and checking accessible duct dampers. You can verify that the problem is fixed when opening closed dampers or reattaching loose duct runs restores balanced airflow across all rooms.
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