For decades, we’ve been guilt-tripped into turning off the lights any time we leave a room — but it turns out that “money-saving” habit might be a total bust. The U.S. Department of Energy has shed ...

Experts say the answer depends on the type of lighting, how long lights are left on, and whether smart systems are in place.

Household rules vary quite a bit from home to home, but there's one that most of us grew up hearing over and over again: "Turn off the lights when you leave the room!" If you had parents who were at ...