A residential attic with exposed wooden rafters, a flexible silver HVAC duct running along the floor, and an air handler unit lit by a beam of light from a small window.

Duct Cleaning in Sacramento, CA

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Step 1 of 3: Equipment

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A metal HVAC air handler with attached flexible and rigid ductwork installed in an unfinished attic with exposed wooden rafters and fiberglass insulation.

Six months of heating pushes dust through the whole system

Your furnace runs November through April here, six months a year. Every time it kicks on, air moves through the ducts and stirs up whatever has settled since the last cycle, dust, pet hair, the fine grit that works its way in around windows and doors. Over a winter that dust doesn't stay put. It rides the airflow and settles into the duct runs, the register boots, the return grilles.

A duct system that hasn't been cleaned in years is carrying more than warm air by the time April comes. It's carrying everything that collected along the way, and the next heating season just adds to it.

6 months: November through April, your furnace pushes air through your ducts
5 months: May through September, your air conditioner does the same

Isometric cutaway illustration of a house interior showing ductwork, vents, an air handler unit, and furnished rooms with a bed, sofas, and a bathroom under a shingled gable roof.

Your ducts carry heat November through April and cooled air May through September.

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NOAA nClimDiv, 1991–2020 normals

How often should air ducts be cleaned?: There is no fixed schedule that fits every home, so watch the house instead of the calendar. If dust builds up fast around your vents, your system seems to be working harder to move air, or someone in the house has new or worsening allergies, that is your sign. Homes with pets or a recent renovation tend to need it sooner than others. A contractor can look at your ducts and tell you honestly whether it is time.
Is air duct cleaning worth it?: It is worth it when there is a real reason behind it, not just as routine upkeep. Dust and debris built up in the ducts can restrict airflow and make your furnace or air conditioner work harder to move air through the house. If your vents show heavy buildup, a family member has worsening allergies, or you have had rodents or a water leak near the ductwork, cleaning solves a real problem. A licensed contractor can check your ducts and tell you plainly whether cleaning will help your situation.
What does air duct cleaning involve?: A contractor sets up equipment that creates suction at one end of the duct system, then agitates the dust inside with brushes or air tools so it pulls free and gets carried out. This happens section by section, covering the supply and return ducts, the grilles, and often the coil area near the furnace or air handler. Done right, the buildup comes out of the house instead of getting pushed further into the ducts.

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