Closing vents in unused rooms damages your HVAC system. Your house and ductwork are designed to work with all registers open, so blocking them creates pressure problems that hurt the equipment.
How often should I close the vents off in rooms that I don't use?
Yeah, I get this question quite a bit. You 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.
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