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The best location for return air vents is strategic to ensure balanced airflow and temperature control. In most homes, placing them in central, open areas like hallways or large living spaces is most effective. Ideally, they should be located across from a supply vent. Climate is also a factor: in warm climates, place vents high on the walls to help remove rising hot air, while in colder climates, lower placement is better. It's also important to ensure that vents placed low on walls are not blocked by furniture. The optimal placement ultimately depends on your HVAC system's design, your home's specific heating and cooling needs, and the accessibility of the ductwork.

The number of return air vents a house should have depends on its overall square footage. You'll need one supply vent and one return vent for every 100 to 150 square feet of living space. This means that, ideally, there should be at least one return air vent in every room. However, if the room is 100 square feet or larger, it's better to have two or three. A 2,000-square-foot home should have between 13 and 20 return air vents, in total.

If you don't clean your air ducts, contaminants like dust, allergens, and mold can accumulate, reducing your home's indoor air quality. Your HVAC system will circulate this dirty air, which can affect your health. Trapped moisture can also lead to mildew and mold growth, especially in humid climates. Additionally, clogged ducts can strain your HVAC system, causing it to run inefficiently, which increases energy costs and can potentially lead to a complete system breakdown.

Exhaust systems should be inspected annually to prevent efficiency loss and address any arising mechanical issues.