what does a thermostat c wire look like

The thermostat c wire is one of the most important components of a home’s HVAC system, yet many homeowners are unaware of what it looks like and why it’s so important. When it comes to maintaining a comfortable climate in a home, a thermostat c wire plays an essential role by providing a dependable power source for the thermostat and other related equipment. While some thermostats may take advantage of battery power, a c wire can provide reliable energy that won’t need to be replaced often. For those who are unfamiliar with this component of heating and cooling systems, understanding what a thermostat c wire looks like can be beneficial.

A thermostat c wire is also known as a common wire and is typically colored white. It is identified by having an extra terminal connection in the junction box of a connected device and is usually located next to the other terminals. The c wire will also have a terminal that has been marked “c” or “common” on it, allowing for easy identification. This wire is usually 18-gauge, which means it is thicker than other wires in the system, allowing for better conductivity. In some cases, the c wire may be labeled as “RC” or “Reverse Common,” and this is because it draws power from the furnace or air conditioner rather than from a wall outlet.

The Smart Thermostat C Wire Explained What If You Don T Have One Diy Home Solutions