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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.

Duct Cleaning in Niles, MI

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An attic interior showing a metal air handler unit connected to flexible silver-wrapped HVAC ducts running beneath a pitched wooden roof.

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

Your furnace runs October through May here, close to eight months a year. On the cold nights, down around 21 degrees, it cycles on and off for hours at a stretch, and every cycle pushes air through the same ducts. Dust, pet hair, and whatever else is sitting in the trunk lines gets stirred up and carried through the house again and again.

With that many months of run time, buildup collects in the bends and joints where airflow slows down. That buildup narrows the path air has to travel, so your furnace works harder to move the same amount of heat through the house.

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 single-story house showing interior rooms with furniture and a network of ventilation ducts and an air handling unit running through the ceiling space.
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?
Most homes do fine having it done every few years, not on a strict yearly schedule. Ducts here run heat from October through May, so they see more months of airflow pushing dust around than homes in milder places. If anyone in the house has allergies, or you notice dust blowing out of the vents, have it looked at sooner. A contractor can check the ductwork and tell you whether it needs cleaning now or can wait.
Is air duct cleaning worth it?
It depends on what is actually in the ducts. If they are visibly dusty, if you just finished a renovation, or if you have pets shedding into the return vents, cleaning clears out what the filter never catches. If the ducts look fine and nobody in the house has breathing trouble, it may not do much. A contractor can inspect the ducts with a camera and tell you whether cleaning will make a real difference in your case.
What does air duct cleaning involve?
A contractor connects a vacuum system to the ductwork and uses brushes or compressed air tools to loosen dust and debris from inside the duct walls, then pulls it out through the vacuum. Every supply and return vent in the house gets cleaned this way, along with the main trunk lines. The furnace or air handler often gets a cleaning too, since dust builds up around the blower and coil. The job is done section by section until the whole system has been gone through.
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