If you need the MAC address of your Nest thermostat, you can find it in the "Technical information" menu. You can only see the menu when the thermostat is mounted and connected to a power source.
- Press the thermostat ring to open the menu overview.
- Turn the ring to go to the settings (gear icon) and select this option by pressing the ring.
- Select Technical information and then Network.
- Scroll down to find the MAC address of your thermostat.