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Several factors contribute to the persistent growth of mold in vents, with excess moisture being the most common culprit. Consistent mold formation in vents indicates an ongoing moisture problem within the HVAC system or its surroundings, likely caused by condensation on cool surfaces in areas with high humidity. Moisture accumulation can also result from leaks in ductwork, inadequate ventilation, or insufficient insulation, creating an environment favorable for mold growth. Regular inspections, addressing potential sources of moisture, maintaining proper ventilation, and routine HVAC maintenance can help prevent the recurrence of mold in vents. If the issue persists, seek professional assistance to identify and rectify the underlying problems.

You can add return vent filters to your HVAC system to help remove contaminants from the air. However, you should avoid adding return vent filters if your HVAC system already has a filter in its air handler. Filters can restrict airflow, which will make your HVAC system work harder.

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.

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.