Moisture, Condensation, And Mould In Tight Homes
Dryers don’t just move heat—they move moisture. If that moisture isn’t exhausted outdoors (or if the vent is leaking/disconnected), it can raise indoor humidity, especially in enclosed laundry closets, basements, and utility rooms.
In its guidance on indoor air quality, Health Canada’s recommendations for improving indoor air in homes emphasizes that laundry activities add moisture and that dryers should vent outdoors, with regular checks to ensure the outside vent isn’t blocked by lint, snow, or debris. That’s a particularly Canadian reality in winter: exterior hoods can be partially buried or iced over, and a “small” restriction can become a major choke point.
Practical takeaway: dryer vent cleaning isn’t only about fire prevention. It’s also about keeping damp air out of the house envelope—especially in colder climates where condensation can show up quickly on cool surfaces.
Drying Time, Energy Use, And Wear
Restricted vents create a performance problem you can feel: longer drying times. Longer drying times usually mean more cycles, more heat exposure, and more wear.
Natural Resources Canada’s guidance on efficient laundry habits in its laundry energy efficiency spotlight links routine lint trap cleaning and vent maintenance directly to airflow, drying time, and reduced strain on the motor, which is a clean way to explain why vent cleaning can pay back in convenience even when nothing is “wrong.”
If you want to zoom out, Natural Resources Canada also notes that household appliances (including dryers) account for up to 14.1% of energy use in the average Canadian home in its ENERGY STAR appliance overview—so airflow problems that quietly extend cycle times can add up across a year of laundry.