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Whether an HVAC damper should be open or closed depends on the season, the zone it controls, and the temperature in that zone. In the summer, open upstairs dampers and close lower-level dampers to get the most efficient cooling possible. In the winter, do the opposite. Cool air will naturally flow down to lower levels, while warm air will rise. This keeps your system from working harder and helps prevent common AC problems.

The Environmental Protection Agency (EPA) states that there's no conclusive evidence to show that dirty or dusty air ducts increase dust and airborne particles in your home or pose any risk to your health. On the other hand, your air ducts require cleaning if there's any mold or mildew, you have a rodent or insect infestation, or you have clogged ducts. Regular air duct cleaning will also extend the life of your HVAC system, leading to less frequent repairs and preventing premature replacement in the future.

Return air ducts should generally not be installed in rooms with high humidity, contaminants, or strong odors. This includes bathrooms, kitchens, garages, closets, attics, and furnace or boiler rooms. Placing vents in these areas can draw moisture, fumes, odors, and potentially hazardous gases like carbon monoxide into your HVAC system, which can damage ductwork, promote mold growth, and compromise your home's indoor air quality and safety. According to the International Code Council, there are some exceptions. For example, a return duct may be placed in a kitchen if it is at least 10 feet away from cooking appliances and serves only that room. Similarly, a garage can have a return duct if it is part of a dedicated forced-air system that only serves the garage. For optimal performance, prioritize installing return air vents in central locations and rooms with consistent temperature needs, such as bedrooms and living spaces. If you are unsure, consult a professional duct installer for guidance.

Yes, rust in ductwork is bad if it’s left untreated. Mild rust can be removed before it causes any significant damage. However, if you ignore rust, it can affect the structural integrity of the ductwork, and you’ll eventually need to replace it entirely. In addition, rust-causing moisture in ducts can also cause mold growth.