A load of towels used to dry in one cycle; now it needs two, sometimes three. When your dryer takes too long to dry, every basket of laundry eats an extra hour of your evening, and the machine burns electricity the whole time it tumbles.
In most homes we visit, the dryer itself is healthy — the real problem lives in the exhaust path. This guide walks through the seven causes we see most often, the checks you can do without tools, and the point where professional dryer repair becomes the faster, cheaper option.
Why your dryer takes forever: seven common causes
A dryer removes water by pushing hot, moist air out of the house. Anything that narrows that path stretches the cycle, which is why four of the seven causes below are, one way or another, about restricted airflow.
A vent line packed with lint
This is the number-one cause, and it builds so gradually that most people only notice once cycles have doubled. Lint clings to the duct walls, the layer thickens, and airflow shrinks year after year. Warning signs: the laundry area turns warm and muggy mid-cycle, the cabinet top feels hot, and clothes come out hotter than usual yet still damp. A restricted vent is also the classic dryer-fire setup — lint is fuel parked in a heat stream — so treat it as more than an annoyance.
A crushed transition duct behind the machine
The short flexible duct between the dryer and the wall flattens easily when the machine gets shoved back after cleaning or a move. Foil accordion-style duct kinks worst of all. If drying slowed down right after the dryer was moved, pull it forward and look: a half-crushed elbow can choke airflow more than a decade of lint.
A stuck or blocked exterior flap
Where the duct exits the house, a louvered hood keeps rain and pests out. Paint, spider webs, a warped louver, or a bird nest can hold it half-closed. Step outside while the dryer runs — you should feel a steady stream of warm air and see the flap standing open. A weak trickle means trouble somewhere upstream.
A glazed lint screen
Even a screen you empty every load can be invisibly sealed. Dryer sheets and liquid softener leave a waxy film across the mesh. Hold the screen under a faucet: if water pools on top instead of passing straight through, scrub it with dish soap and a soft brush. Two minutes, and a surprising amount of airflow comes back.
A moisture sensor coated with residue
Auto-dry cycles depend on two metal strips inside the drum that read dampness as clothes brush across them. The same softener film that glazes the screen insulates these bars, so the dryer misjudges the load — running far past dry on some cycles, quitting early on others. If your machine also ends cycles prematurely, that points the same direction; our guide to a dryer that shuts off too soon covers that half of the symptom.
A weakening heating element or burner
Electric elements can fail partially: the dryer still makes heat, just not enough. Gas models show a similar pattern when the igniter or gas valve coils tire and the burner lights less often than it should. The tell is temperature — if the exhaust feels merely warm rather than properly hot twenty minutes in, suspect heat output rather than airflow.
Simple overloading
A drum stuffed to the top cannot tumble, and air only dries what it can move through. Mixed loads make it worse, because towels keep the sensor reading damp long after the shirts are done. If a half-size load dries in normal time, your dryer is fine — the loading habits are the problem.
What you can safely check yourself
- Cut the power first. Unplug the dryer before pulling it away from the wall or reaching behind it. If yours runs on gas, never disconnect or strain the gas line — slide the machine gently, and leave anything on the fuel side to a professional.
- Wash the lint screen. Warm water, dish soap, soft brush; let it dry completely before it goes back in.
- Inspect the transition duct. Look for kinks, crush points, and gaps at both ends. Flimsy foil duct is worth replacing with semi-rigid aluminum.
- Feel the exterior exhaust. With the dryer on high, airflow at the outside hood should flutter a sheet of paper. Weak flow means restriction between drum and hood.
- Wipe the moisture sensor. Find the two metal strips inside the drum — usually below the door opening — and clean them with rubbing alcohol on a cloth.
- Run a timed test. Dry a medium load on a timed cycle instead of auto-dry. If timed heat dries clothes normally, the sensor is lying, not the heater.
When to stop troubleshooting and call a pro
Some of these jobs are not worth your Saturday, and a few are genuinely unsafe to chase on your own:
- Cycles still drag past 80 minutes after you have cleaned the screen, duct, and hood — the blockage likely sits deep in a wall or ceiling run that takes rotary brushes to clear.
- You smell hot lint or scorching while the dryer runs. Stop using it until someone inspects it.
- The exhaust never gets properly hot. Testing elements, igniters, and thermostats involves live-voltage measurements.
- The breaker trips during long cycles, which can mean an element shorting against its housing.
- Your vent run exits through the roof. Attic and roof-cap work is a fall risk best left to someone with the right equipment.
Drying laundry in Florida humidity
Dryers here start with a handicap: intake air. A machine in a garage or utility room pulls in summer air already loaded with moisture, so each pass through the drum evaporates less water than the same cycle would manage in Arizona. Long duct runs through hot attics add another twist — humid exhaust can condense inside the duct, and damp lint packs harder than dry lint. That is why we tell customers on dryer repair calls in Jacksonville to schedule vent cleaning yearly, not "eventually." Weighing equipment choices for this climate? Our comparison of gas versus electric dryers in Florida humidity goes deeper.
How GDOING handles slow-drying dryers
Our visit starts with a $75 diagnostic that measures airflow and exhaust temperature to separate vent problems from component failures — and the fee is waived when you approve the repair. Roughly 95% of the dryers we see are fixed on the first trip, since our vans carry common elements, sensors, and thermostats. Every job is backed by a 1-year parts and labor warranty, with same-day appointments often available Monday through Saturday. Call 904-946-9057 or request repair service online.
Frequently asked questions
How often should a dryer vent be cleaned?
Once a year for most households; twice if you have shedding pets, dry lots of towels, or your duct run is long with several elbows. Put it on the calendar the way you would an HVAC filter change.
Why do towels take so much longer than everything else?
Towels hold several times their weight in water, so they expose airflow problems first. A dryer that handles shirts fine but needs two rounds for towels is usually in the early stage of a vent restriction.
Does a slow dryer actually cost me money?
Yes. A dryer is one of the most power-hungry appliances in the house, and doubling its runtime roughly doubles the electricity behind every load. Restoring full airflow pays you back with every basket.
Is a long-running dryer dangerous, or just annoying?
Take it seriously. The same restriction that slows drying also traps heat around a bed of flammable fluff — the standard recipe for dryer fires. Slow drying is often the earliest warning you get.
