Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

I must stress that there are many possible ways a set of three-way light switches can be connected. This step-by-step is reflective of a common wiring scenario and the one in my own home.

Treatlife notes that its dimmer needs to be installed at the “input end of the 3-way line;” that is, it must be first in the circuit en route the line from the distribution box. Figuring this ...

Three-way switches are common at staircases ... Turn off the power to the circuit at the main panel and test to make sure there is no power at the switches. Remove the cover plates and mounting ...