A short single-speaker YouTube tip advising homeowners not to close supply vents because houses are designed with specific supply/return balances. The speaker says closing vents disrupts airflow; instead, close the door only if there is sufficient undercut or other return path so the conditioned air can return to the HVAC system.
Should close the vents off. Never ever, ever close the vents off in your house. Your house is made and designed to condition with those amounts of grills or runs in that room or in that space. So you should never close off that room. Close the door to that room. I'll take it back. You can close the door if you have enough room for the air to get back to the return. So you and some houses and they have really thick carpet, you close the door and you have to kind of slam it shut. Okay, well air is going to have a hard time getting through that space and some homes have a good undercut under the door so you close it and the air still flows out. So what goes in must come out. Same thing here with air. If it goes into the house it must come back to the return. So you want to make that as easy as possible. Never ever close the vents.
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