Six Signs Your Dryer Vent Is Overdue for Cleaning
A dryer vent almost never fails without warning. It tells you for months beforehand, in ways most people write off as the appliance getting old. Learning to read those signals is the cheapest safety upgrade in the house, because lint restriction is both the most common cause of dryer fires and the easiest one to remove.
By Dan Joel, Elite Sweepers Inc.
1. Clothes need a second cycle to dry
The short answer: restricted airflow means moisture has nowhere to go. A dryer works by pushing heated air through the load and carrying the moisture outside. When lint narrows the duct, that moist air stalls inside the drum and the machine simply reheats damp clothes. If a normal load suddenly takes two cycles, the appliance is rarely the problem — the exhaust path is.
2. The laundry room gets hot and humid
The short answer: the heat and moisture that should be leaving the house are staying in it. A properly vented dryer sends nearly all of its heat outdoors. If the room is noticeably warm and the air feels damp by the end of a load, the duct is not moving enough volume. In a finished basement this is often the first symptom anyone notices.
3. Clothes come out unusually hot
The short answer: the machine is holding heat it cannot exhaust. Garments that are hot to the touch at the end of a cycle mean internal temperatures are running higher than designed. Dryers have thermal cutoffs for exactly this reason, and repeated tripping wears them out. Persistent overheating is also what turns accumulated lint from a nuisance into a fire risk.
4. A burning or musty smell during a cycle
The short answer: either lint is scorching or moisture is sitting in the duct. A hot, singed odor means debris is heating against components that should not be that warm, and it warrants stopping the load and having the system looked at. A musty smell points the other direction — trapped moisture in a duct that never fully clears, which grows its own problems over time.
5. The outside vent flap barely moves
The short answer: a healthy dryer should push that flap open with obvious force. Go outside while a load runs and watch the exterior hood. Strong, steady airflow is what you want. A flap that trembles slightly, or one crusted with lint around the edges, tells you most of the air is not making it out. A hood that stays shut entirely means the duct is close to fully blocked.
6. It has simply been more than a year
The short answer: time alone is a valid reason. Annual cleaning is the general standard for a typical household, and homes with long duct runs, multiple elbows, a large family or pets that shed will accumulate faster. If you cannot remember the last cleaning, that is your answer. A dryer vent cleaning restores the full diameter of the duct rather than just clearing the ends, which is the part a shop vacuum at the wall cannot do.
A note on what dryer vent cleaning is not
The short answer: it is a separate system from your heating ducts. Cleaning the dryer exhaust does nothing for the air your furnace circulates, and cleaning the HVAC ducts does nothing for lint. If your concern is dust, mold or debris in the supply and return registers, that is air duct cleaning, a different service with different reasons to book it. Confusing the two is common and leaves the actual problem in place.
Elite Sweepers Inc is insured and bonded, and you get the price up front before any work starts — nothing changes at the end of the visit. We cover Homer Glen and the surrounding southwest suburbs, including chimney sweep service in Orland Park, and we answer the phone seven days a week from 7 AM to 7 PM. Call (708) 432-3977, or review our chimney service pricing first.
Frequently asked questions
How often should a dryer vent be cleaned?
Once a year suits most households. Move to more frequent cleaning if you run several loads a day, have a long or winding duct run, dry pet bedding regularly, or have already seen drying times creep up.
Can I clean the dryer vent myself?
You can clear the lint trap and the first accessible stretch with a brush kit, and that is worth doing. What homeowners generally cannot reach is the middle of a long run, the elbows where lint packs hardest, and the exterior hood if it sits on a second story or a roof.
Does a clean lint screen mean the vent is fine?
No. The screen catches a portion of the lint, and the rest travels into the duct. Plenty of blocked vents sit behind a screen that gets emptied after every load, so the two are not interchangeable checks.
Is a plastic or foil accordion duct a problem?
Yes, and it is worth replacing. Ribbed flexible duct traps lint in every groove and can sag or crush behind the appliance. Rigid or semi-rigid metal duct has a smooth interior, resists crushing, and is what modern installation practice calls for.
Why is my dryer vent clogging so quickly after a cleaning?
Usually the duct run itself is the issue rather than the cleaning. Excessive length, too many elbows, a crushed section behind the dryer, or a vent hood with a screen over it will all trap lint faster than normal. Correcting the run solves what repeat cleanings only manage.
Do gas dryers need vent cleaning more than electric ones?
The lint accumulates about the same, but the stakes differ. A gas dryer produces combustion byproducts including carbon monoxide, which the vent carries outside, so a blockage in a gas dryer duct is a ventilation problem as well as a fire risk.
Can a blocked dryer vent raise my energy bill?
Yes. When each load takes one and a half or two cycles instead of one, you are paying for that extra run time every time you do laundry. The added wear on the heating element and motor shortens the appliance life as well.
Does the vent hood outside need anything done to it?
It should be checked and cleared as part of the service. Hoods collect lint around the flap, and some have bird screens that are notorious for clogging solid. Birds nesting in an exterior hood is common in spring and blocks the duct completely.
Published August 10, 2026
