Is it OK to cover air vents? You could mess with the air flow.
Just because you cover the vent, it doesn’t mean your HVAC system knows that. It will keep pushing air to those vents, and if they’re closed, you could cause a buildup of air pressure and insufficient airflow which could damage your system.
What can I use to cover a heat vent? To block off a heating vent with sheet magnet, start by measuring the height and length of the vent. Then, cut out a piece of sheet magnet that’s the same size as the vent. Once you’ve cut out the piece of sheet magnet, stick it over the vent and you’re finished!
How do you seal unused vents? Permanently Covering Vents
The least expensive method to seal the vent opening is to remove the vent cover from the ceiling, cut a piece of cardboard to fit inside the vent cover, tape the cardboard in place with polyurethane tape, and reinstall the vent cover.
Why shouldn’t you cover your vents? A blocked air vent can permit mold or mildew to develop in and around your vents and ductwork if you reside in a humid location. You can be wasting money on utility costs. You most likely thought covering your air vents would certainly save you energy, but it does the opposite.