Jan 14, 2016 · Regarding thermostats, one thing you do have direct control over relates to a single wire called the C, or "common" wire. Contrary to its name, the C-wire isn't actually all …

2 days ago · What Is a C Wire? The C wire, a.k.a. the "common wire", allows a constant flow of 24 VAC (volts AC) power to a smart thermostat. However, the C wire doesn’t provide the actual …

Sep 2, 2025 · Known as the common wire, (C-Wire) provides WiFi thermostats continuous power from heating (e.g. furnaces) and cooling systems (e.g. Air Conditioning systems). C-Wires are …

2 days ago · The C wire is the common or neutral conductor in a low-voltage (typically 24V AC) HVAC control system. This conductor provides a continuous return path back to the system’s …

C-wire explained: what it does, how to add one, and when an adapter works just as well. The “C” stands for Common. It completes the 24-volt circuit that powers your thermostat’s display, Wi …

What is a C wire or common wire? If you’re considering a smart thermostat, a C wire (common wire) may be required. We’re here to guide you through the process to determine if a …

What Is a C-Wire? The C-wire, short for common wire, is your smart thermostat’s dedicated power line. It provides continuous 24-volt power directly from your HVAC system.

May 22, 2025 · The C-Wire or common wire, connects your smart thermostat to your HVAC and provides a continuous power source. Without a C-wire, your thermostat may not function.

Apr 15, 2025 · The C Wire, or common wire, provides continuous power to your thermostat. This constant power supply can enhance the functionality and efficiency of your HVAC system.

5 days ago · What Is a C-Wire? A C-wire, also called a common wire, is a wire that provides steady power to your smart thermostat. It doesn’t control heating or cooling. Instead, it delivers …