6. Install dimmers or sensors on light switches. Not only are dimmer switches helpful for creating a lovely ambience, but they can also help save energy by allowing you to keep lights at the lowest level required. As an extra step, you could ask to install vacancy sensors, which automatically shut off lights when no one is in the room.7. Switch to CFL or LED bulbs. If you haven't done it yet, switch over all of your bulbs from incandescents to CFL or LED bulbs, which last far longer.