Google Nest Thermostat and Apple HomeKit: Complete Integration Guide
Google Nest thermostats don't support HomeKit natively. This guide covers every method to get your Nest working in the Apple Home app, including HomeBridge and third-party bridges.
Why Nest Doesn't Work with HomeKit
Google Nest thermostats — including the Nest Learning Thermostat (3rd and 4th gen), Nest Thermostat E, and the standard Nest Thermostat — do not support Apple HomeKit natively. Google has shown no indication of adding HomeKit support, as it competes directly with Google Home and Google Assistant.
This is a deliberate business decision, not a technical limitation. The Nest API is well-documented and accessible, which means HomeBridge plugins and third-party bridges can absolutely provide a reliable HomeKit integration. If HomeKit control of your thermostat is important to you, this guide will get you there.
Method 1: HomeBridge with homebridge-nest
The most reliable and fully-featured method is using HomeBridge with the homebridge-nest plugin. This plugin uses Google's Device Access API to communicate with your Nest thermostat. You'll need a HomeBridge installation running on a Raspberry Pi, Mac, or another always-on computer (see our HomeBridge setup guide).
To use the Google Device Access API, you need to: (1) Create a Google Cloud project and enable the Smart Device Management API. (2) Create OAuth2 credentials. (3) Go to the Device Access Console at console.nest.google.com/device-access, create a project (there's a one-time $5 fee), and link your Nest account. (4) Install homebridge-nest in the HomeBridge UI and configure it with your Project ID, Client ID, and Client Secret. The plugin's GitHub page has a detailed step-by-step for the OAuth flow.
Once configured, your Nest thermostat will appear in the Home app with full control: target temperature, current temperature, heating/cooling mode, and fan control. The status updates every 60 seconds by default.
Method 2: Using an ecobee Instead
If you haven't bought a thermostat yet, or you're willing to switch, the ecobee SmartThermostat Premium and ecobee SmartThermostat Enhanced both have native HomeKit support. Setup is as simple as scanning a HomeKit code on the thermostat's packaging. The ecobee is a genuine like-for-like competitor to the Nest Learning Thermostat and offers room sensor support, Alexa built-in, and excellent scheduling.
For new smart thermostat buyers, the ecobee is the strongest recommendation if Apple HomeKit is a priority. It works natively with HomeKit, Alexa, Google Home, and SmartThings — you don't need HomeBridge or any workaround.
What You Can Control via HomeBridge
With the homebridge-nest plugin, you get the following controls in the Home app: current temperature reading, target temperature (cooling and heating setpoints), thermostat mode (heat, cool, heat-cool, off), current HVAC state (heating, cooling, idle), fan mode on/off, and humidity reading as a separate sensor accessory.
Automations work as expected. You can set 'If I leave home, set Nest to Eco mode' using Home app automations, or use Shortcuts to create scenes that include your Nest temperature along with lights and other accessories.
Troubleshooting Common Issues
The most common issue is the Google OAuth flow expiring or your tokens being revoked. If your Nest disappears from HomeKit, check the HomeBridge log for authentication errors. You may need to re-run the OAuth flow to get a fresh token. The homebridge-nest GitHub issues page has a dedicated troubleshooting section for this.
If you see the thermostat in HomeKit but it doesn't respond to commands, verify your HomeBridge server has a stable internet connection — the plugin communicates with Google's cloud servers, not directly with the thermostat. Also ensure the Device Access API is still enabled in your Google Cloud project.