How a Blocked Vent Wastes Energy
A clothes dryer moves hot air through wet laundry to evaporate moisture. When the exhaust duct is partially blocked, this hot, moist air cannot escape efficiently — so the dryer runs longer to dry the same load. Every additional minute of run time consumes electricity or gas that a properly functioning dryer would not need.
The U.S. Department of Energy estimates that a clogged dryer vent can increase drying time by 30 percent or more. For a household running five loads of laundry per week, that adds up to a significant increase in annual energy consumption.
The Compounding Effect
Energy waste from a blocked dryer vent compounds over time in two ways. First, the more restricted the vent becomes, the longer each cycle runs. Second, running longer means the heating element cycles on more frequently — which adds wear on the most energy-intensive component of the appliance. An inefficient dryer that runs more uses more energy and wears out sooner.
Clean Vent, Lower Bills
After a professional dryer vent cleaning that restores normal airflow, drying cycle times return to baseline. For most households, this means loads that were taking two cycles to dry return to one. Over a full year of laundry, the energy saved from that reduction in cycle time more than offsets the cost of professional cleaning.
- Reduced cycle time means fewer kilowatt-hours or cubic feet of gas per load
- Consistent one-cycle drying reduces wear on the heating element
- Normal operating temperature reduces thermal stress on drum components