A residential attic with flexible silver HVAC ductwork connecting to an air handler unit, surrounded by blown-in fiberglass insulation and exposed wooden rafters.

Duct Cleaning in Glassboro, NJ

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A silver foil-insulated flexible air duct running through an attic filled with loose fiberglass insulation and wooden roof framing.

Seven months of heating pushes a lot of air through your ducts

Your furnace runs from October through April here, close to seven months a year. Winter nights averaging 28°F keep it cycling on and off through the night, and every cycle pushes air through the same ducts, carrying dust and whatever else has settled in them. That buildup does not clear itself out. It sits in the ductwork and gets blown through the house again each time the furnace kicks on.

7 months: October through April, your furnace pushes air through your ducts
4 months: June through September, your air conditioner does the same

Isometric cutaway illustration of a single-story house showing interior rooms, furniture, and a network of gray ductwork connected to an air handling unit.

Your ducts carry heat October through April and cooled air June through September.

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NOAA nClimDiv, 1991–2020 normals

How often should air ducts be cleaned?: There's no fixed schedule that fits every home. Look for signs instead. Dust building up around the vent covers, a musty smell when the furnace kicks on, or more dust settling on furniture than seems normal. Homes with pets, a recent renovation, or someone with allergies tend to need it sooner than others. A contractor can check inside the ductwork and tell you whether it's actually due.
Is air duct cleaning worth it?: It's worth it if your ducts actually have a buildup problem, not as something to do on a routine schedule. A contractor can look inside the ductwork with a camera and show you what's in there before you pay for a cleaning. If the ducts are already clean, cleaning them again won't improve your air or how your furnace runs.
What does air duct cleaning involve?: A contractor connects a vacuum system to the ductwork, then uses brushes or air tools to knock loose the dust and debris built up inside. That gets pulled out through the vacuum along with everything it stirs up. The supply and return vents get cleaned too, and since dust settles on the coil and blower as well, a contractor will usually check those while they're in there. The furnace filter typically gets replaced or cleaned as part of the same visit.

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