There are several advantages to using dimmer switches, including: Cost savings: Switching to dimmers can save you about 10% on your utility bill Fewer bulb replacements: Dimmers reduce the amount of power delivered to the light source, so they save on energy and can extend the life of the bulb. More control: You’re able to regulate your lighting the way that you want. Low maintenance: Once installed, in-wall dimmer switches require little to no maintenance. Before you install a dimmer switch, turn off the power at the breaker. You can also use a voltage detector to test for live wires before doing any work. Once the power is shut off, unscrew your old switch plate and remove the old switch. Follow the instructions on the dimmer switch to swap it in. If the switch has pre-attached wires, connect them using wire connectors. Once the wires are attached, fasten the switch to the electrical box and screw in the switch plate. Turn the breaker back on and test your light. Note that if you’re installing a smart switch, you’ll likely need a neutral wire. Call a licensed electrician if you’re not sure your wall box is up to code.