Derek Cole explains why closing HVAC vents or using plastic diverters backfires. A smoke test shows conditioned air rises to the ceiling then descends along the outside wall, so redirecting flow inward doesn't work the way people think it does.
So I would never 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 will 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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