Energy use sneaks up on you. One day, you think you’re being responsible—flipping off lights, not running the AC excessively, turning the TV off after “Game of Thrones”—and the next day, you’re standing slack-jawed by the mailbox, staring at a power bill that must have been racked up by gnomes living in your closet.

Pretty much everyone has accidentally gone overboard on energy use, but there’s a lot you can do to keep your expenses in check. These eight easy, expert-approved tips promise to curb your usage and prevent the power-bill blues.