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.
How do you cover unused air vents?
Can you block off air vents? Preventative maintenance will keep your HVAC system in top operating condition for maximum efficiency. Additionally, you shouldn’t block any air vents inside your homes. Covering HVAC vents will not conserve energy or decrease energy costs. In fact, it can result in the opposite.
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.