How to Install a Google Nest Learning Thermostat
Safely replace an existing thermostat with a Google Nest Learning Thermostat by tagging low-voltage wires, mounting the leveled base, and seating the display.
- Read the tools, materials, safety notes, and steps below for free.
- Tap Start Camera Coach when you want hands-free voice help.
- Allow camera and microphone. Point your phone at the work; the coach watches your progress and tells you the next step.
🧰 Required Tools & Equipment
- ✓ Phillips screwdriver
- ✓ Wire stripper
- ✓ Smartphone with camera
- ✓ Pencil
📦 Materials & Supplies
- ✓ Google Nest Learning Thermostat kit
- ✓ Drywall anchors
- ✓ Wire labels
- ✓ Painter's tape
⚠️ Safety Checkpoints & Warnings
- • Switch off HVAC breaker before touching any wiring to prevent blowing the control board fuse.
- • Verify system is standard low voltage (24V); do not connect to 110V/240V line-voltage wires with thick wire nuts.
- • Tether loose wires with a pencil or tape so they do not fall back behind the wall cavity.
📋 Step-by-Step Guide (7 Steps)
Turn off HVAC power and verify shutdown
Locate your main circuit breaker or HVAC service switch and flip it to OFF. Adjust the temperature on your old thermostat and wait 30 seconds to ensure the furnace or AC does not kick on. The old display should be completely powered down or unresponsive to heat/cool calls.
- • Old thermostat screen is blank or shows no power reaction when buttons are pressed
- • Breaker switch clearly set to OFF position in service panel
- • Turning off only the AC breaker while leaving the furnace blower power active
- • Assuming a battery-powered screen going black means main HVAC power is cut
Remove faceplate and photograph wire configuration
Pull the old thermostat faceplate straight off its wall plate. Take a clear, high-resolution photo showing exactly which wire connects to which labeled terminal (such as R, W, Y, G, C). If you have jumper wires between R and Rc, note that Nest does not need them.
- • Clear photo captured on smartphone showing all terminal letters and wire insulation colors
- • Old thermostat faceplate removed, exposing wire terminals on the wall plate
- • Disconnecting wires before taking a clear, well-lit photo
- • Confusing secondary terminal markings (e.g., heat pump O/B labels vs conventional W/Y labels)
Label wires and disconnect old backplate
Affix the matching Nest sticker label to each individual wire based on the terminal it is currently screwed into. Loosen the terminal screws, pull the wires free, and wrap them around a pencil across the hole so they cannot slide back into the wall. Unscrew and remove the old mounting plate.
- • Every wire has an adhesive label attached near its stripped tip
- • Wires bridged across the drywall opening by a pencil or taped flat to the wall
- • Old wall plate fully removed from drywall
- • Letting wires snap back into the drywall opening
- • Assuming wire jacket color dictates terminal function instead of following actual terminal letters
Mount the Nest base with the built-in level
Thread the labeled wire bundle through the center hole of the Nest base plate (and optional decorative trim plate if covering unpainted wall spots). Hold the base against the wall and rotate it until the bubble in the built-in level is centered between the two lines. Drive the included screws directly into drywall or pre-drilled pilot holes.
- • Bubble inside the built-in level vial is centered precisely between black guidelines
- • Nest base sits flush against drywall with no wobble when gently pulled
- • Overtightening screws, which can bow the plastic base and prevent the display from snapping on
- • Mounting without checking the bubble level, resulting in a crooked screen display
Insert wires into terminal push-buttons
Inspect wire ends to ensure 3/8-inch of straight, clean bare copper is exposed; trim and re-strip if bent. Press down the terminal button on the Nest base and push each labeled wire into its matching connector port (R/Rc into R, W into W1, etc.) until the button stays depressed. Ensure no stray bare copper extends past the plastic housing.
- • Terminal push-buttons remain depressed flat after wire insertion
- • Each wire is fully seated with no exposed bare copper visible outside the port
- • Failing to push the wire deep enough to latch the internal spring clamp
- • Re-inserting old jumper wires (Nest automatically connects R to Rc internally)
Attach Nest display and restore power
Tuck excess wire slack smoothly back into the wall opening so the base is uncluttered. Line up the Nest display ring with the base, ensuring the rectangular connector pin aligns with the socket, and push straight in until it clicks firmly into place. Return to the breaker panel and switch the HVAC power back ON.
- • Nest display sits completely flush against the base with no visible gap
- • Google logo or setup animation lights up on the round screen
- • Forcing the display on when wires are bunched up behind it
- • Pushing the display at an angle, bending the internal connector pins
Complete on-screen setup and run test cycle
Rotate the outer ring to select your language, Wi-Fi network, and heating/cooling equipment type according to the wiring detected on-screen. Run the built-in system test for both heating and cooling, feeling your supply air vents to confirm warm and cold airflow. Pair the device with the companion mobile app using the on-screen pairing key.
- • Nest screen shows green checkmarks on the wiring diagram matching your physical connections
- • Supply vents blowing actively during the respective Heat and Cool test modes
- • Skipping the test cycle and assuming the unit works without checking actual vent temperature
- • Selecting Heat Pump instead of Conventional when you have a standard gas furnace
Credit: inspired by an original tutorial by Google Nest — watch the original on YouTube.
Don’t have everything?
- No Wire stripper? Utility knife (carefully score insulation perimeter)
- No Pencil (wire holder)? Painter's tape stuck firmly across drywall hole