Clean Dryer Vents or Waste Energy and Risk a Fire
You'll have to remove the vent from the back of the dryer to clean it. Suck debris from the ducts with a wet/dry vac, or ream them out with a cleaning kit that includes a brush on a long flexible rod that attaches to a power drill. The kits are available at home centers. If your ducts need replacing, get smooth metal ducts, which will stay cleaner longer than the rough corrugated surface of flexible ducts. Avoid plastic ducting altogether; it can be a fire hazard. Plus: Slash Heating Bills
Stop Under-the-Door Air Leaks
If you can feel the breeze and see daylight under your entry door, it's costing you big-time. It also means you need to adjust your door threshold or install a new door sweep. Door sweeps start at $10. The hardest part about replacing them is usually taking off the door.
Start by adjusting the threshold. Newer versions have screws that raise and lower them. Turn all of the threshold screws until the door opens and closes without much drag and any draft is eliminated. If that doesn't work, or your threshold doesn't have adjustment screws, replace the door sweep.
Close the door and pop out the hinge pins with a pin punch to remove the door. Set the door on a work surface and remove the old door sweep. Caulk the ends of the door, then install the replacement sweep. Some sweeps are tapped into place and stapled along the door bottom; others are screwed to the side along the door bottom. If a drafty sliding patio door is your problem, here's how to fix it.
Repair a Loose Doorknob