Why does a dryer take so long to dry a load? In most homes around here it’s restricted airflow, not a broken machine.
Lint packed inside the duct does it. So does a crushed section behind the wall, or a long run to a second-floor laundry room. All three choke the exhaust the same way. Clear the path, and drying time drops back to one cycle.
The five-minute test for a restricted vent
Start a load. Then go outside to the exhaust hood while it’s running. Hold your hand a couple of feet back from the flap and see what you feel.
A clear line pushes warm air out steady enough to notice from that distance, and the flap swings mostly open and stays there. A weak trickle means something’s wrong. So does a flap that barely lifts, even when you tap it. Either one means something between the machine and that hood is restricting the airflow.
That’s it. That’s the whole test.
If the airflow feels strong and the load still runs long, the duct probably isn’t your problem. The causes further down this page are worth checking before you call anyone.
The causes, most likely first
Most calls I get about a dryer that takes a long time to dry come down to one of six things. A few are DIY in ten minutes. A couple are not.
| Cause | How to confirm it | DIY or professional |
|---|---|---|
| Lint packed inside the duct itself, past the trap | Weak airflow at the outside hood, per the test above | DIY for a short straight run under about 8 feet, professional beyond that |
| Long or crushed flexible foil duct behind the dryer | Pull the dryer out and look for accordion-style ridges instead of smooth pipe | Not a DIY fix once it needs replacing, and it’s why flexible foil duct behind the dryer is a code violation in most jurisdictions now |
| Overloading, or running back-to-back loads with no gap | Check whether a normal single load also runs long, or only the big ones | DIY, just smaller loads run one at a time |
| A lint screen that looks clean but is coated invisibly | Wipe the screen, then run a finger across it and feel for a waxy film | DIY, wash it with dish soap once a month |
| A bird or rodent nest blocking the outside hood | Look at the hood from outside, the flap should move freely | DIY if you can safely reach it, otherwise call |
| Low heat from a gas dryer that isn’t a duct issue at all | The load comes out only slightly warm even with a clear vent | Not us. That’s a gas appliance problem and needs an appliance or gas technician |
The first two rows cover most of what I actually find. If the outside test showed weak airflow, dryer vent cleaning near you clears a packed line in one visit for most Sacramento-area homes. The price moves with the length and height of the run, so see the price by vent type before you assume every job costs the same.
Why is my dryer not drying at all?
If your dryer runs hot, the drum turns, and nothing comes out actually dry, check the outside vent hood first. A fully blocked duct traps hot, humid air with nowhere to go, so the dryer keeps running without any real airflow moving through it. The load just sits there, no drier than when it started. Nothing mechanical failed.
When you don’t need duct cleaning at all
Two cycles to dry one load doesn’t always mean the duct is the problem. Say you already wipe the lint screen down every load, and the vent hood pushes air strong when you test it. Then you’re probably just overloading the dryer.
Or a dryer sheet has worked its way onto the screen and is blocking it without being obvious to the eye. Fabric softener sheets leave a waxy residue on that screen long before it looks dirty. Wash it with dish soap, run one normal-sized load by itself, and see if the problem disappears before you book anyone.
A dryer that takes a long time to dry every load, on every setting, for months, is a different story than one bad week. If it’s been gradual and getting worse, that points at buildup inside the line rather than a one-off overload.
A field note on second-floor laundry rooms
I see this constantly in the newer Rocklin, Roseville, and El Dorado Hills subdivisions. They were built over the last fifteen or twenty years. The laundry room sits on the second floor for convenience, and the duct has to run twenty or thirty feet through the attic and down an exterior wall to get outside.
That’s a lot of pipe for lint to settle in. Builders often ran it in flexible foil instead of rigid metal, because foil is cheaper and easier to snake through framing. Every ridge in that foil catches lint. A house built this way needs the duct cleaned on a shorter interval than a ground-floor laundry room with six feet of straight rigid pipe to the wall.
While you’re checking airflow, two related problems
Dryer ducts aren’t the only path in a house that stops moving air correctly. A gas fireplace will not light for a similar-sounding reason sometimes: a restricted gas line, or a fouled sensor, rather than anything to do with lint. It’s worth ruling out if a fireplace nearby started acting up around the same time your dryer did.
The flue version of the same idea is chimney draft explained, which covers why a chimney stops pulling air the way a duct does when something blocks the path.
Who does the work
Every dryer vent inspection and cleaning across the five counties around Nevada City is done by the same person, start to finish. There’s no dispatcher. No second technician shows up in a different truck. You can read who does the work before you decide whether to call.
When to stop and call someone
Lint is what turns a slow-drying dryer into more than an inconvenience. It doesn’t take much. It’s paper-thin. It sits packed against a heating element that runs well over two hundred degrees, and it needs almost no oxygen to catch once enough of it collects in one place.
A duct that only costs you an extra ten minutes today can be the same duct that stops moving air completely a year from now, and a blocked duct with nowhere for that heat to go is exactly the setup a dryer fire needs.
A few situations aren’t do-it-yourself territory, and one of them isn’t even a duct problem. If you smell gas anywhere near the dryer or the laundry room, stop, leave the appliance off, and call the gas company or a licensed gas technician right away. That’s not something to wait on or diagnose yourself.
If the vent run climbs to a second story or terminates on the roof, that’s not a ladder-and-shop-vac job either, and the access alone is worth having someone experienced handle. And if you ever notice a burning smell, scorch marks, or an outside hood too hot to touch after a load, unplug the dryer. Don’t run it again until the line’s been checked.
If the outside test showed weak airflow, or you’d rather know for certain than keep guessing, a dryer vent inspection is $59. It’s credited straight into the cleaning if you go ahead. Call (916) 833-2959, 7am to 7pm, seven days a week, and ask for the dryer vent inspection.