“How does it work without a C wire? I have an old 2 wire thermostat.”
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Nest Thermostats can usually power itself by using the wires from your heating and cooling system, with the batteries acting as backup power. However, when your heating and cooling wires are not able to deliver the needed power for your Nest thermostat, you may need to connect a common or C wire since it helps deliver enough consistent power to your thermostat. Learn more about Common wire by checking the help article on this link: https://support.google.com/googlenest/answer/9251212
Sorry, there was a problem. Please try again later.It is my understanding that most can work without a C wire. There is a video on YouTube that shows how it can be done. https://youtu.be/nki-65gtvac
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