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 Springfield, IL

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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 means seven months of buildup

Your furnace runs October through April here, seven months of the year. Every one of those months it's pulling household air through the same ducts, and dust, pet hair, and whatever gets tracked in settles in the return runs and builds up on the duct walls over a season of steady use.

Dirty ducts don't just sit there quietly. That buildup gets sent back into the air every time the blower kicks on, all winter long, in a house that's already closed up tight against the cold.

7 months: October 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 with a dark shingled roof, showing interior rooms and a network of metal ventilation ducts with vents and an air handling unit.

Your ducts carry heat October 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's no fixed schedule that fits every home. Homes with pets, a recent renovation, or someone with allergies tend to need it more often than others. If you see dust building up around the vent covers or notice a stale smell when the air is running, that's a sign it's time. A contractor can look at your ducts and tell you what condition they're actually in.
Is air duct cleaning worth it?: It's worth it when there's a real problem to fix, like dust that keeps coming back after cleaning or a musty smell when the system runs. It won't cure allergies or lower your heating bills on its own. A contractor can look at the ducts and tell you whether cleaning will actually help your situation.
What does air duct cleaning involve?: A contractor connects a vacuum system to the ductwork and uses brushes or air tools to knock loose dust and debris from inside the ducts, then pulls it out through the vacuum. The vent covers, the coil, and the blower compartment usually get cleaned too, since dust collects there as well. The ducts get sealed back up once it's done so they stay clean until the next service.

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