A c-wire is an important detail to be aware of if you’re upgrading to a new, smart thermostat. Unlike the old-school, battery-operated thermostats they’re rapidly replacing, these units incorporate intelligent technology—such as Wi-Fi connection options, a multifunctional color touchscreen display and integration into home automation systems—which requires continuous 24-volt electrical power. Short for “common wire,” a c-wire is the extra wire necessary to complete the circuit that provides that power. Many newer homes are already pre-wired with a c-wire connected […]