Derek Cole shows why blocking floor vents and wall returns with furniture kills your HVAC system's ability to condition a room. Air rises from the vent, hits the ceiling, and descends back down. A smoke test demonstrates the airflow pattern, and even a couch against a return wall stops it cold.
What I have seen and what you need to be careful of is when the vents are in the floor, do not put furniture over the vents. Do not put a couch smack dab against the wall at the return. That will cause a problem. So back up a little bit, give it a little bit of room, and don't put furniture and things like that over the floor grills because it's trying to If it's on the floor, okay, it's supposed to be on an outside wall. So it's trying to condition that wall. So the air is blowing up. I mean, if you were like doing a smoke test, you can actually see it. The air would be going up, hitting the ceiling, and then falling back down to condition the wall. So if you have furniture or something in the way, obviously that can happen.
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