TL;DR: Turn off power at the breaker, remove your old thermostat, label the wires, then mount the Nest base and connect wires to matching terminals. Snap the display on, restore power, and follow the Google Home app prompts to finish setup.
Step 1: Prep and Power Down
Switch off your HVAC system at the breaker box. Verify power is off by adjusting the old thermostat—nothing should click or start. Remove the old faceplate and photograph the wire connections before disconnecting anything.
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Step 2: Label and Disconnect Wires
Use the included stickers to label each wire by its terminal letter (R, W, Y, G, C, etc.). Loosen the screws and gently pull wires free. If you see a jumper wire between Rh and Rc, note it—Nest handles this internally.
Step 3: Mount the Nest Base
Level the Nest base plate over the old hole and mark screw positions. Drill pilot holes if needed, then secure the base with the provided screws. If the hole is large, use the trim plate to cover gaps.
Step 4: Connect the Wires
Push each labeled wire into its matching Nest connector and tug lightly to confirm it’s seated. The C wire is optional but recommended for steady power. Cap any unused wires with electrical tape.
Step 5: Attach Display and Restore Power
Press the Nest display onto the base until it clicks. Turn the breaker back on. The thermostat will boot and show a welcome screen.
Step 6: Complete App Setup
Open the Google Home app, add the device, scan the QR code on the back of the display, and select your system type. Answer the wiring questions and connect to Wi-Fi. Run a test cycle to confirm heating and cooling respond correctly.
Tips
If Nest reports “no power” on C, your system may need a common wire installed. Mount Nest away from direct sunlight, drafts, and doorways for accurate readings. Save your old thermostat photo until setup is fully complete.
FAQ
Q: What if I don’t have a C wire?
A: Nest can often run without one, but you may see occasional power warnings. For reliable performance, install the included power connector or add a C wire.
Q: How long does installation take?
A: Most installs take 30 to 45 minutes, including app setup and a test cycle.
Q: Can I install Nest with a heat pump?
A: Yes. During app setup, select heat pump and configure the O/B reversing valve setting for your system.
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