How Do I Add Nest to Google Assistant? To add your Nest device to Google Assistant, start by opening the Google Home app on your smartphone. Tap the "+" icon to add a device, then select "Set up device" > "Works with Google." Search for "Nest" and sign in with your Nest account to link it. Once linked, your Nest thermostat, camera, or doorbell will appear in the Google Home app, and you can control it using voice commands through Google Assistant.