Even with energy-efficient CFL and LED light bulbs, you can still save even more energy and money at home by using a dimmer switch. For lighting fixtures that are on for the majority of the day, replacing a standard switch with a dimmer switch can mean saving around 4 to 9 percent in energy costs. The more you dim, the more you save. And while most people associate dimmer switches with saving on traditional incandescent bulbs, CFL, LED and halogen bulbs can also be used. An average house can recoup about 20 percent in lighting cost savings per year with this simple switch.