If you’re looking to replace your old thermostat with a new smart or WiFi thermostat, you may face the problem of adding a new C wire/common wire (if your current thermostat wiring doesn’t have one in place). We’ve clearly explained everything about C wire in our detailed guide. If you don’t have a c wire in your current wiring (between the furnace and thermostat), the best solution is to use a C wire adapter – like Venstar Add a Wire kit or use a 24 Volts C wire transformer. A C wire adapter (common wire adapter) is basically a small electronic device, which re-purposes the existing wiring between your thermostat and the furnace, to add a new wire to the system. This new wire will serve as the C wire or common wire to provide the necessary power to the thermostat. Installing an adapter is pretty easy and can be…

If you’re researching online to buy a new thermostat, you may have stumbled upon the term “C wire” or “Common wire” many times. Just like many other folks, you might be confused “What is a c wire?” In this guide on “thermostat c wire” – we explain everything you need to know about the Common wire,  known popularly as the C wire. The purpose of a C wire is to ensure continuous flow of 24 volts AC power supply to the thermostat. Back in the olden days, thermostats were just on/off switching devices and they used to draw the necessary power from the heating system itself (be it a furnace or a boiler). There was no need for the thermostat (old models) to be turned on 24/7, as they had nothing much to do while the furnace is not working. Modern smart thermostats and WiFi enabled thermostats are feature rich,…