A large galvanized steel air duct bends through a dimly lit wooden crawl space, with dust particles visible in a shaft of light coming through a louvered vent.

Duct Cleaning in Philadelphia, PA

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Flexible silver HVAC ducts and a sheet-metal plenum box inside a dimly lit attic with fiberglass insulation and a louvered vent casting light through dust.

Seven months of heating packs your ducts full

Your furnace runs October through April here, close to seven months a year. On the cold nights in between, the ones that average 27°F, the system cycles on and off again and again, and every start pushes air through the ducts and stirs up what has settled in them. Dust and fine debris ride that air into the rooms you live in.

That buildup collects in the bends and low points where airflow slows down, and it sits there until someone cleans it out. A long heating season gives it more chances to build with each cycle.

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 house interior showing rooms with furniture and a branching network of ducts running through the ceiling space to ceiling vents.

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?: Most homes do fine having their ducts cleaned every few years, not every year. If anyone in the house has allergies, or you've had a rodent problem or a renovation that kicked up a lot of dust, it's worth doing sooner. Homes with pets or smokers tend to need it more often too, since fur and residue build up faster in the ductwork.
Is air duct cleaning worth it?: It's worth it if your ducts actually have a buildup problem, not as a routine thing to do on a schedule. Signs it's worth doing include visible dust blowing out of the vents, a musty smell when the system runs, or dust that resettles on furniture within a day or two of cleaning. It won't fix allergies on its own and it won't lower your heating bills, so a contractor should look at the ducts first rather than just scheduling a cleaning.
What does air duct cleaning involve?: A contractor connects a powerful vacuum to the duct system, then uses brushes, air whips, or compressed air tools to knock loose dust and debris from inside the ducts so the vacuum can pull it out. This is done at each vent and return throughout the house, and the supply and return sides both get cleaned. The vents themselves, the grilles, and sometimes the blower compartment get wiped down as part of the same visit.

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