A white louvered dryer or exhaust vent screwed into dark navy horizontal lap siding, with a blurred sunset and silhouetted trees visible in the background.

Dryer Vent Cleaning in Des Moines, IA

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A grey plastic exhaust vent mounted on dark blue vinyl house siding, with a blurred dusk sky and bare tree visible in the background.

Cold pushes lint further into the vent

Your dryer sends out warm, damp air, and that air hits a cold vent the moment it leaves the drum. Des Moines nights average 16°F from December through February, and the metal vent runs close to that cold most of the winter. The warm air cools fast against those walls, and the lint riding along with it sticks instead of blowing clear out the hood.

That buildup narrows the path air has to travel. A dryer that cannot push air out easily runs hotter and takes longer to dry a load, and the lint sitting in the line is what a house fire needs to start.

16°F: the average winter night, and cold vents catch damp lint
8 months: October through May, the vent stays cold

Line illustration of a gray front-loading dryer next to a transparent wall, with a flexible duct running from the back of the appliance to a vent hood on the wall.

Your vent runs coldest from November through March.

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NOAA nClimDiv, 1991–2020 normals

How often should a dryer vent be cleaned?: Once a year for most households. If you dry a lot of loads, have a long vent run, or notice towels and jeans taking longer than they used to, clean it more often than that. A vent that runs clean shortens dry times and keeps lint from building up where the duct bends or meets the outside hood.
Can I clean my dryer vent myself?: You can handle the lint trap and the first few feet behind the dryer, but the rest of the run is harder to reach and harder to judge. Most vents run several feet through a wall or attic space before reaching the outside hood, with bends where lint collects out of sight. A contractor uses a brush and vacuum sized for the full length of the duct, and checks that the outside hood flap opens and closes the way it should.
What are the signs of a clogged dryer vent?: Clothes that take longer to dry than they used to, a dryer that runs hot to the touch, and a burning smell during the cycle are the main signs. Lint around the outside vent hood or a hood flap that barely moves when the dryer runs also points to a blockage. Any of these is worth having looked at, since a clogged vent makes the dryer work harder and raises the risk of a lint fire.

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