Dryer taking too long to dry clothes? Seven causes to check
When a dryer starts needing two cycles, the cause is usually airflow, not the machine. The Consumer Product Safety Commission says damp clothes at the end of a normal cycle, or drying that takes longer than normal, may mean the lint screen or the exhaust duct is blocked. This guide lists seven things to check in order, from free to paid, and says clearly when the problem is a repair that is not ours.
By Steve · Published October 20, 2026
The short answer
- Damp clothes after a normal cycle, or longer drying than usual, may mean a blocked lint screen or exhaust duct. That is the CPSC's wording.
- Check for free first: the lint screen, the hose behind the dryer, the load size and the outside vent flap.
- If air barely comes out of the outside vent while the dryer runs, the vent or the exhaust duct may be blocked.
- A camera inspection and airflow test is $89. A cleaning is $129.
- If the vent is clear and the dryer still does not heat or dry, that is an appliance repair. We clean and document. We do not repair dryers.
The quick answer
If your dryer takes two cycles, start with airflow. A dryer works by heating air, passing it through the clothes, and pushing the damp air out through a duct. When the duct is restricted, the damp air lingers and the clothes stay wet. The CPSC names this directly: damp clothes at the end of a normal cycle, or drying that takes longer than normal, may be a sign that the lint screen or the exhaust duct is blocked.
Work through these in order. The first four are free.
Seven causes, from free to paid
1. The lint screen. Clean it before or after every load. A screen with a film you can barely see through still restricts air. Do not run the dryer without it.
2. The load. A dryer packed full cannot tumble the clothes or move air through them. A smaller load dries faster than two packed ones.
3. The hose behind the dryer. The USFA says to check that the venting behind the dryer is not damaged, crushed or restricted. A flexible hose folded flat when the machine was pushed back is a common problem and costs nothing to fix. The CPSC also advises replacing plastic or foil accordion-type duct with rigid or semi-rigid metal duct.
4. The outside flap. Start a load, go outside, and check that exhaust air comes out and that the flap opens. If the air is weak or the flap hardly moves, something between the dryer and the outside is blocking the flow. The DIY guide covers what you can do yourself.
5. A long or upstairs run. A dryer with the laundry room upstairs sends its exhaust through the attic or a wall to a roof cap or upper wall. A long run with several elbows loads with lint faster, and you cannot see the problem from the room. See where an upstairs dryer duct goes and what cleaning costs.
6. Birds at the exit. A warm, sheltered vent hood is the right size for a nest. Nesting material blocks the flapper and packs the last stretch of the run. The birds in dryer vents guide explains the signs.
7. The dryer itself. If the vent is clear and the dryer runs but does not heat, or shuts off, that is an appliance problem. This is a repair, and it is not our service. We would rather tell you that than book a cleaning that will not fix it.
How to tell causes 1 to 6 from cause 7
A blocked vent usually shows up as damp clothes, a hot laundry room, weak air at the outside vent, or lint around the hood. A failing machine tends to show up as no heat at all, odd noises, or a dryer that stops. The signs of a clogged dryer vent guide lists the checks in detail, and the two-minute checklist scores your answers.
A burning smell is different. Stop using the dryer until the vent has been checked. If you see smoke or flames, leave the house and call 911.
When to call a pro
If the free checks do not fix it, the next step is to find out what is inside the duct. A camera inspection and airflow test is $89, and it tells you whether a cleaning is worth buying. If the signs are clear, the dryer vent cleaning is $129 for a wall exit, with an airflow reading before and after and camera proof on your phone before the technician leaves.
For what a fair price looks like, see the dryer vent cost guide. For how often to repeat the job, see how often to clean a dryer vent in Arizona.
The services this guide is about
Common questions
- Why is my dryer taking two cycles to dry?
- The most common reason is restricted airflow. The CPSC says that if clothing is still damp at the end of a typical drying cycle, or drying takes longer than normal, this may be a sign that the lint screen or the exhaust duct is blocked.
- How do I check if the vent is blocked?
- Start a load, go outside to the vent hood or roof cap, and check that exhaust air is coming out and that the flap opens. The CPSC and the USFA both give this check. If it is not, the vent or the exhaust duct may be blocked.
- Should I clean the lint screen every time?
- Yes. The CPSC says before or after each load, and the USFA says before and after each cycle. Never run the dryer without it.
- My laundry room gets hot while the dryer runs. Is that related?
- It can be. If the exhaust cannot leave through the duct, some of the heat and moisture stays in the room. It is one of the signs on our list of signs of a clogged vent.
- Can you fix a dryer that does not heat?
- No. We clean and document dryer vents. A dryer that runs but does not heat is an appliance repair, and we will say so rather than book a cleaning that will not fix it.
- What does it cost to have the vent checked?
- A camera inspection and airflow test is $89. A standard dryer vent cleaning is $129, or $179 for a roof or second-floor exit. The technician confirms the exit before work starts.
Sources
- Overheated Clothes Dryers Can Cause Fires (Publication 5022) — U.S. Consumer Product Safety Commission. Source for damp clothes or longer drying as a sign of a blocked lint screen or exhaust duct, the outside vent check, and metal duct. Accessed October 20, 2026.
- Clothes Dryer Fire Safety — U.S. Fire Administration, FEMA. Source for cleaning the lint filter before and after each cycle, checking the venting behind the dryer, and making sure the outdoor covering opens. Accessed October 20, 2026.
Ready when you are
Published price. Camera proof. Guaranteed for 90 days.