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Return air
Return air is the air that flows back to the HVAC system to be heated or cooled again.
Why it matters
Adequate return air prevents pressure problems. Without enough return, doors slam, efficiency drops, and some rooms starve for airflow.
Where people get this wrong
Return air needs an open path. Closing doors in a house with only one central return can cause comfort and pressure problems.
Real-world example
A bedroom feels stuffy with the door closed. There is no return in the room and no transfer grille. The air cannot get back to the system.
Where this hits your build
This affects daily comfort in every room. Problems often show up after move-in when certain rooms run hot, cold, or noisy.
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