Indiana HVAC Guide
Silver flexible HVAC ducts and an air handler sit in a wood-framed attic filled with loose-fill fiberglass insulation.

Duct Cleaning in Kokomo, IN

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Step 1 of 3: Equipment
A residential attic interior with blown-in insulation on the floor, flexible silver HVAC ducts, a metal plenum box, and wooden rafters lit by light entering through a small louvered vent.

Eight months of heat pushes dust through the same ducts

Your furnace runs October through May here, close to eight months a year. On nights averaging 21°F, it cycles on and off again and again, and each cycle pushes air through the same ducts. Whatever has settled on the duct walls, dust, pet hair, fine debris, gets stirred loose and carried into the rooms you're heating.

A system pushing air through ducts coated with that buildup works harder to move the same amount of heat. Over eight months of near-constant use, that buildup only grows.

8 months
October through May, your furnace pushes air through your ducts
3 months
June through August, your air conditioner does the same
Isometric cutaway illustration of a house interior showing ductwork running from a furnace through rooms with furniture, a bathroom, and a bedroom, under a shingled roof.
Your ducts carry heat October through May and cooled air June through August.

NOAA nClimDiv, 1991–2020 normals

How often should air ducts be cleaned?
There's no fixed schedule that fits every house. Watch for signs instead. Dust coming out of the vents, a musty smell when the air kicks on, or a recent construction or renovation job that could have kicked debris into the ductwork are all reasons to have them looked at. Any of those matters more than how long it's been since the last cleaning.
Is air duct cleaning worth it?
It's worth it when there's a real reason for it, not as routine maintenance on its own. Visible dust blowing from the vents, a musty smell when the air kicks on, or someone in the house dealing with unexplained allergy symptoms are all signs the ducts are worth having looked at. Cleaning them when there's no sign of a problem usually doesn't change how the system runs or how the air feels.
What does air duct cleaning involve?
A contractor uses brushes and a high-powered vacuum to loosen and pull dust and debris out of the ductwork. The supply and return vents get cleaned too, since dust settles right at those openings. Most contractors will also check the coil and blower while they're in there. Those collect buildup as well, and that buildup affects how well the system moves air once the ducts are clear.
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