Air Duct Cleaning FAQ

NADCA recommends every three to five years. Homes with pets, smokers, or family members with allergies may benefit from cleaning every two to three years. Sunnyvale residents who have experienced wildfire smoke should consider cleaning after significant smoke events. Read our full guide on how often to clean your air ducts.

In the San Francisco Bay Area, homeowners typically pay between $300 and $700 for a standard residential duct cleaning. FreshFlow provides free, detailed estimates. See our full Sunnyvale pricing guide.

For a typical Sunnyvale home with a single HVAC system, approximately two to four hours. Larger homes with multiple systems may take four to six hours. We provide a time estimate during your free consultation.

Yes, for most homeowners. The EPA notes that indoor air can be two to five times more polluted than outdoor air. Professional duct cleaning removes accumulated dust, allergens, mold spores, and other contaminants, improving indoor air quality, HVAC efficiency, and potentially reducing allergy symptoms.

FreshFlow uses the NADCA-recommended source-removal method. We inspect with video cameras, connect truck-mounted vacuum to create negative pressure, then use compressed air whips, rotary brushes, and skipper balls to dislodge debris from duct walls. Every supply and return duct is individually cleaned.

Many allergy sufferers experience improvement after professional duct cleaning. Your ductwork can harbor pollen, dust mite debris, pet dander, and mold spores. Removing them reduces daily allergen exposure. Read our in-depth article on air duct cleaning and allergies.

We recommend that an adult be present at the start and end of the service for the inspection walkthrough and results review. You do not need to be present during the entire cleaning process.

No. We lay down floor coverings, use drop cloths, and our truck-mounted vacuum captures all debris outside your home. Because we operate under negative pressure, contaminants are pulled out of the ductwork rather than released into your living space.

Signs include visible dust blowing from registers, dust buildup on vent covers, musty odors, and increased allergy symptoms. See our full list of 7 signs your air ducts need cleaning.

You can do basic maintenance like vacuuming register covers and changing filters. But true duct cleaning requires truck-mounted vacuums, rotary brushes, and video inspection cameras. Read our DIY vs. professional cleaning comparison.

Clean ducts allow air to flow freely, so your HVAC system does not have to work as hard. The Department of Energy notes that 25% to 40% of HVAC energy is wasted due to system inefficiency, and dirty ducts are a significant contributor.

Spring and early fall are popular choices. Spring prepares your system for summer cooling; fall removes wildfire smoke particles and prepares for heating. But if your ducts need cleaning, there is no reason to wait. We offer same-week scheduling year-round.

NADCA is the National Air Duct Cleaners Association, the industry's primary trade organization. NADCA sets the ACR standard for proper duct cleaning methods. Choosing a NADCA-certified company like FreshFlow means hiring a company vetted by the industry's leading authority.

Yes. Dryer vent cleaning is available standalone or as an add-on. We recommend annual cleaning regardless of your duct cleaning schedule, as lint buildup is the leading cause of dryer fires.

FreshFlow serves Sunnyvale (home base), Mountain View, Santa Clara, Cupertino, Los Altos, and Milpitas. We serve both residential and commercial customers.