Question about C wire with Nest

[NestTroubleBob]

Looking to purchase a Nest Smart Thermostat but I have no C Wire.  Will it work?

[listairee]

Hello @NestTroubleBob,

Thanks for reaching out. Unlike other wires connected to your thermostat, a C wire doesn’t control heating or cooling functions. It only provides constant power to the Nest thermostat. Please use the following compatibility checker to check if your system is compatible with Nest thermostats: Compatibility Checker.

Hope that helps! 🙂

[NestTroubleBob]

Did that already. They suggested I call an HVAC specialist. So, I believe nobody really knows not even the manufacturer. 

[listairee]

Hello @NestTroubleBob ,

Thanks for your information. You can refer to this link for more information.

Hope that helps! 🙂