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FWIW. low/no airflow to a room is typically due to poor supply duct design and lack of adequate return ducting. Ask a good HVAC company about a "Zoning system". This system splits the space into zones using a temperature sensor for each zone. If a zone doesn't need heating or cooling the dampers will typically be set to allow a minimal amount of air to pass and force the air to zones that need heating or cooling. Again, it's a pricey system but you get more balance and based on the layout of your home, yours will be a bit difficult to balance without the use of zoning.
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Nick
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