Smoke alarms should be installed on every level of your home, inside every bedroom, and outside each sleeping area. Mount them on the ceiling or high on a wall, 6 to 8 inches below the ceiling. Avoid placing them near windows, doors, or ducts where drafts could interfere with their operation.

Electrical fires frequently start inside walls where you cannot see them, often caused by faulty wiring, overloaded circuits, or damaged cords. Warning signs include frequently tripping breakers, flickering lights, discolored outlets, or a burning smell with no visible source. If you notice any of these, call a licensed electrician.