Using Homebridge for Nest Thermostat and Apple HomeKit Integration

Homebridge is an open-source platform that allows you to integrate non-HomeKit compatible devices like the Nest Thermostat with Apple HomeKit. Please note that this is an unofficial workaround and may require some technical expertise.

1. Install and set up Homebridge on your computer or a Raspberry Pi:

   • Follow the official Homebridge installation guide (https://github.com/homebridge/homebridge/wiki) for your specific operating system

2. Install the Homebridge Nest plugin:

   • Open the terminal or command prompt on your computer or Raspberry Pi

   • Enter the following command to install the Homebridge Nest plugin: sudo npm install -g homebridge-nest

3. Obtain your Google Account credentials for Homebridge Nest:

   • Follow the instructions in the Homebridge Nest plugin GitHub repository (https://github.com/chrisjshull/homebridge-nest) to obtain your Google Account credentials for the plugin

4. Configure the Homebridge Nest plugin:

   • Open the Homebridge configuration file (config.json) in a text editor

   • Add the following configuration to the "platforms" section of the file, replacing YOUR_GOOGLE_ACCOUNT_EMAIL, YOUR_GOOGLE_ACCOUNT_PASSWORD, and YOUR_GOOGLE_ACCOUNT_ISSUE_TOKEN with your actual credentials: 
     {
       "platform": "Nest",
       "email": "YOUR_GOOGLE_ACCOUNT_EMAIL",
       "password": "YOUR_GOOGLE_ACCOUNT_PASSWORD",
       "googleAuth": {
         "issueToken": "YOUR_GOOGLE_ACCOUNT_ISSUE_TOKEN",
         "cookies": "google.com"
       }
     }
   • Save the changes and close the file

5. Restart Homebridge:

   • Restart Homebridge for the changes to take effect

6. Pair Homebridge with your Apple Home app:

   • Open the Apple Home app on your iOS device

   • Tap the "+" icon in the top-right corner and select "Add Accessory"
   • Scan the Homebridge QR code displayed in the Homebridge logs or use the provided setup code
   • Follow the on-screen instructions to complete the pairing process

7. Control your Nest Thermostat with Siri:

   • You can now use Siri voice commands to control your Nest Thermostat, such as:

     • "Hey Siri, set the thermostat to 72 degrees"
     • "Hey Siri, what's the temperature in the living room?"
     • "Hey Siri, turn the heat up/down"

Please keep in mind that using Homebridge and the Homebridge Nest plugin is not an officially supported solution, and you may encounter issues or limitations. Always ensure that your system is up-to-date and that you follow best practices for maintaining the security of your devices and accounts.