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It is common for mold to grow around air vents, especially in areas with high humidity or moisture problems. These vents provide a perfect environment for mold to thrive due to the condensation caused by the meeting of warm and cool air. Mold growth can be accelerated by the presence of dust and debris around the vents. Regular maintenance, proper ventilation, and addressing any water leaks or excess humidity can prevent the growth of mold around air vents.

At a minimum, an HVAC system should be serviced once per year. However, a twice-a-year service schedule—once in the spring for the cooling system and once in the fall for the heating system—is often recommended, especially for older systems, heat pumps, or in climates with extreme temperatures. Regular service, which includes inspection, cleaning, and maintenance, ensures the system runs efficiently, helps prevent costly breakdowns during peak seasons, and can extend the unit's lifespan. You can also schedule a service if you notice issues like poor performance or strange noises.

The frequency for cleaning air vents can vary. As a general guideline, you should inspect and clean your return air vents at least once a year, while a more thorough cleaning of all vents is recommended every two to five years. However, you should clean them more frequently if you notice a significant buildup of dust or debris on the vents, see mold growth, find signs of a pest infestation, or notice an unusual amount of dust accumulating on your furniture. More frequent cleaning may also be necessary to maintain good indoor air quality if household members have allergies.

Use air purifiers, clean regularly, and ensure proper ventilation to reduce pollutants.