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It is generally not a good idea to completely cover or close air vents. While you might have heard that closing vents in unused rooms saves energy, it does not improve HVAC performance or lower your energy bills. In fact, blocking, covering, or fully closing vents can create a buildup of pressure inside your ducts, which can lead to leaks, holes, or other problems. To maintain proper airflow, you should also avoid covering vents with furniture. If you want to reduce airflow to unoccupied parts of your home, it is better to partially shut the vents (between 50% and 75%) rather than closing them completely.

Yes, a bowl of vinegar can absorb smoke. If you want to use this method to reduce the smoke smell in your house, all you have to do is leave a bowl (or multiple bowls) of white vinegar out overnight. Alternatively, you can use bowls of baking soda, coffee grounds, or activated charcoal.

You should not spray pesticides of any kind into your air vents. The spray won’t reach far into the vent, minimizing its effectiveness in killing roaches, but more importantly, it’s dangerous for people and pets to inhale these chemicals. Roach spray is not a natural roach repellent, and it’s not safe to spray into air vents.

Ozone smoke removal uses an ozone generator to eliminate stubborn odors from sources like house fires, wildfires, or cigarette smoke. Ozone (O3) is a highly reactive, unstable gas that neutralizes odors by oxidizing the organic compounds it comes into contact with. During this oxidation process, ozone "donates" its extra oxygen molecule to the smoke particles, effectively eliminating their smell, with oxygen being the primary byproduct. While ozone can be effective for removing smoke smells from building materials and belongings like wood furniture, this treatment is best left to a professional, as improper use of an ozone generator can be dangerous to your health.