How Often Should You Clean a Dryer Vent? A GTA Homeowner's Guide

The baseline answer: once a year

For a typical GTA detached or semi-detached home running five to eight loads a week through a duct under 20 feet, once a year is the right interval. That schedule keeps airflow near the dryer's design rate, keeps dry times to a single cycle, and keeps lint from compacting into the plug that turns a routine cleaning into a two-hour job. Everything below is an adjustment to that baseline.

Frequency by home and household

Why duct length matters more than dryer brand

Dryers are generally engineered for about 25 equivalent feet of duct. Equivalent is the key word: each 90-degree elbow counts for roughly five feet and each 45-degree bend for about two and a half. A townhouse run with a 15-foot straight section and three elbows is already at 30 equivalent feet before a single strand of lint lands in it. That system is operating at reduced airflow on day one, so the margin between clean and restricted is much smaller and the interval has to be shorter.

Pets, bedding and the loads nobody counts

Pet hair does not behave like cotton lint. It is fine, it carries static, and it binds to the duct wall instead of tumbling out the hood, so it builds a felt-like lining that narrows the pipe evenly along its length. Homes with a shedding dog or two cats typically need service twice as often as the same house without them. Heavy items - duvets, mattress protectors, dog beds - shed far more per load than clothing and should be counted as two or three loads each when you estimate your volume.

The right time of year in Ontario

Book late summer or early fall. Two reasons, both specific to our climate. First, once heating season starts every venting trade in the GTA is booked out, and a dryer vent call competes with furnace and chimney work for the same slots. Second, cold weather is when a lint-loaded backdraft damper freezes partly shut. Moist exhaust condenses at the hood, the lint holds the moisture, and the flap ices in place - the duct then backs warm humid air into your laundry room all winter, which is where the musty smell and window condensation come from.

Signals that override the calendar

• A normal load needs more than one cycle to dry.
• The dryer body, the laundry room, or the clothes come out unusually hot.
• You can no longer feel strong exhaust at the exterior hood during a cycle.
• Lint is visible around the outside hood or on the ground below it.
• There is a burning or hot-dust smell during a cycle.
• The dryer shuts off mid-cycle and restarts after it cools.
• The laundry room smells damp or musty after loads.

Any one of those means the duct is restricted now, regardless of when it was last cleaned. Our detailed walkthrough of each symptom explains which ones mean stop using the dryer today.

What you can do between professional cleanings

1. Clean the lint screen before every single load, and wash the screen with soap and water twice a year to remove dryer-sheet residue that blinds the mesh.
2. Vacuum the lint screen housing with a narrow crevice tool every few months.
3. Go outside during a cycle and confirm you feel strong warm airflow at the hood.
4. Pull the dryer out once a year and vacuum behind and under it.
5. Replace any white vinyl or thin foil transition duct with rigid or semi-rigid metal - vinyl is not code-compliant and it collapses behind the appliance.
6. Do not push a dryer tight against the wall; leave the manufacturer's clearance so the transition duct is not crushed.

What you cannot do from the laundry room is clear the far end of the run, the elbow packs, the booster fan or the exterior damper. Those are where GTA ducts actually block, and they need a rotary brush fed the full length with vacuum capture at the source.

Keep the record

Keep the dated photo report and the before and after airflow readings from each visit. If you ever file a dryer-related insurance claim, a maintenance history is the difference between a straightforward claim and a long argument. It also tells the next technician exactly what your duct looked like last time, which speeds up the visit.