Installing Your Google Nest Learning Thermostat (4th Gen)

Before You Begin

The Google Nest Learning Thermostat (4th Gen) features a large, high-resolution borderless display, Matter support, and a redesigned interface. It learns your temperature preferences over time and automatically creates energy-saving schedules. This latest generation connects via Wi-Fi and supports Thread for Matter-enabled smart home integrations.

What You Will Need

• Google Nest Learning Thermostat (4th Gen)
• The included trim kit, mounting plate, and screws
• The included Nest Pro wiring connector
• The Google Home app installed on your smartphone (iOS or Android)
• A Google account
• A compatible HVAC system (the Google Home app includes a compatibility checker)
• A Phillips-head and flat-head screwdriver
• A drill and level (optional but recommended)
• Labels or tape to mark existing thermostat wires
• A C-wire or the included Nest Power Connector if your system lacks a C-wire

Step 1: Check Compatibility

1. Open the Google Home app and navigate to Devices > Add > New Device.
2. Select the Nest Learning Thermostat (4th Gen) and use the built-in compatibility checker. The app will ask about your current thermostat wires to determine if your HVAC system is compatible.
3. Alternatively, remove the faceplate from your existing thermostat and note the wire labels (R, W, Y, G, C, etc.). Enter these into the compatibility tool.
4. If your system does not have a C-wire (common wire), you will need to install the included Nest Power Connector at your furnace or air handler to provide reliable power.

Step 2: Turn Off HVAC Power

1. Turn off the power to your heating and cooling system at the circuit breaker or the system's power switch. This is critical for safety.
2. Set your old thermostat to off before disconnecting it.
3. Verify the system is off by checking that the furnace or air handler fan is not running.

Step 3: Remove Your Old Thermostat

1. Remove the faceplate from your old thermostat.
2. Take a photo of the wiring connections for reference before disconnecting anything.
3. Label each wire with the terminal letter it is connected to (R, W, Y, G, C, etc.) using the included wire labels or tape.
4. Disconnect each wire from the terminals.
5. Remove the old mounting plate from the wall. If the screw holes do not match the Nest mounting plate, you may need to patch the old holes.

Step 4: Install the Nest Power Connector (If Needed)

1. If your system lacks a C-wire, install the included Nest Power Connector at your furnace or air handler.
2. Open the furnace panel and locate the HVAC control board.
3. Follow the instructions in the Google Home app or the included guide to connect the Power Connector between the furnace control board and the thermostat wiring.
4. Close the furnace panel when finished.

Step 5: Mount the Nest Thermostat

1. Thread the labeled thermostat wires through the center opening of the Nest mounting plate.
2. Use a level to ensure the plate is straight, then mark the screw holes.
3. Drill pilot holes if needed and secure the mounting plate with the included screws.
4. Connect each labeled wire to the corresponding terminal on the mounting plate. Press each connector tab down, insert the wire, and release the tab to secure it.
5. Attach the trim kit around the mounting plate for a clean, finished appearance.
6. Align the thermostat display onto the mounting plate and press firmly until it clicks into place.

Step 6: Power On and Complete Setup

1. Turn the HVAC power back on at the circuit breaker.
2. The Nest thermostat will power on and display a setup sequence on its screen.
3. Open the Google Home app and follow the prompts to complete the setup — connect to Wi-Fi, link your Google account, and configure your heating and cooling preferences.
4. Set your preferred temperature schedule or enable Auto-Schedule to let the thermostat learn from your manual adjustments over the first week or two.
5. Enable Home/Away Assist to automatically adjust the temperature when you leave and return home based on your phone's location and the thermostat's built-in presence sensor.

Tips for Best Performance

• Allow the Nest Learning Thermostat at least one to two weeks of manual adjustments to build an accurate automatic schedule.
• The 4th Gen model supports Matter, allowing it to work with other Matter-compatible platforms beyond Google Home.
• Use the Energy Dashboard in the Google Home app to track your energy usage and see monthly savings reports.
• The large, borderless display can show weather, time, and device controls at a glance when you walk by, thanks to the built-in proximity sensor.