A sunlit attic interior showing exposed wooden rafters, a skylight, and a silver insulated flexible HVAC duct running along the plywood floor toward an air handling unit.

Duct Cleaning in Utica, NY

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

Nine months of heat moving through the same ducts

Your furnace runs September through May here, nine months of the year. That is nine months of air moving through the same ducts, carrying in whatever dust and pet hair is in the house and leaving some of it behind on the walls of the duct every time.

On winter nights that average 15°F, the furnace runs long and often to keep the house warm, pushing more air, and more of what is in that air, through the same passages. Over years, that buildup narrows what the duct can carry and gives the furnace more resistance to push against just to move the same amount of heat.

9 months: September through May, your furnace pushes air through your ducts
2 months: July through August, your air conditioner does the same

Isometric cutaway illustration of a single-story house with a dark gabled roof, showing a ducted ventilation system connected to an air-handling unit and rooms containing sofas, a bed, and bathroom fixtures.

Your ducts carry heat September through May and cooled air July through August.

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NOAA nClimDiv, 1991–2020 normals

How often should air ducts be cleaned?: There's no fixed number of years that fits every home. It depends on whether anyone smokes indoors, how many pets shed in the house, and whether any past renovation work left dust in the vents. If you see dust kick up from the registers when the furnace comes on, or a room stays dusty no matter how often you clean it, that's worth a look sooner rather than later.
Is air duct cleaning worth it?: It's worth it when there's a real reason behind it, not just as something to do on a schedule. Dust and debris sitting in the ducts don't make a furnace run less efficiently on their own, so cleaning them won't lower a heating bill by itself. Where it matters is air quality and airflow. If a duct run is clogged enough to choke off air to a room, or if the system was exposed to construction dust, rodents, or water, cleaning it solves a problem that's actually there. A contractor can look at the ductwork and tell you whether cleaning will fix what's bothering you.
What does air duct cleaning involve?: A contractor connects a vacuum system to the ductwork and uses brushes or air whips to knock loose the dust built up along the duct walls, then pulls it all out through the vacuum. Every supply and return register in the house gets opened up and cleaned this way, along with the main trunk lines. The furnace or air handler usually gets cleaned in the same visit, including the blower and coil, since it's part of the same air path. A good contractor checks the ducts for damage or leaks while they're open, since a gap in the ductwork lets heated or cooled air escape into the attic or basement instead of the room it's meant for.

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