A short excerpt from a Derek Cole YouTube video ("How to improve your home's HVAC efficiency") giving practical HVAC advice. The speaker strongly advises against closing supply vents or installing plastic diverters, explaining that redirected airflow prevents the system from properly conditioning outside walls and reduces effectiveness.
So I would never close. Close off the vents, and I would never use the. Go to some houses, you see the little plastic diverters, you know, blows the air in the middle of the house. Again, another bad idea, because if you were to do a smoke test in your house, what you would see is when the air comes out of the grill, you see it go up to the ceiling and then fall down the wall. It's trying to condition that outside wall. So by pushing it to the inside of the room, it's not doing any good. So I would stay away from that and never close your vents. So it's never okay. I don't care. It's never okay.
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