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Google Nest ‎T3 Learning Thermostat 3rd Gen Installation Guide

Google Nest ‎T3 Learning Thermostat 3rd Gen featured

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Google Nest ‎T3 Learning Thermostat 3rd Gen

Google Nest ‎T3 Learning Thermostat 3rd Gen


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Based on Nest’s online compatibility checker data, the Nest Thermostat works with most 24V systems, including gas, electric, oil, forced air, variable speed, heat pump, and radiant. It can control:

  • Heating: one, two, and three stages (W1, W2, W3)
  • Cooling: one and two stages (Y1, Y2)
  • Heat pump: with auxiliary and emergency heat (O/B, AUX, E)
  • Fan (G)
  • Power (C, RH, RC)
  • Humidifier or dehumidifier (HUM, DEHUM)

The Nest Thermostat’s * connector can accept only one of these wires: W3, E, HUM, or DEHUM. The Nest Thermostat is designed to work even if your home doesn’t have a common (C) wire. Rarely, installing a new C wire may be required. Professional installation recommended for:

  • Dual fuel systems (heat pump with furnace)
  • Whole-home humidifiers and dehumidifiers


Google Nest ‎T3 Learning Thermostat 3rd Gen 1

Google Nest ‎T3 Learning Thermostat 3rd Gen 2

Switch off power
This protects you and avoids blowing a fuse in your equipment. Adjust your old thermostat’s temperature to ensure your system is off.

Google Nest ‎T3 Learning Thermostat 3rd Gen 3

Remove cover
Some covers pop off, while others need to be unscrewed.

Google Nest ‎T3 Learning Thermostat 3rd Gen 4

Check your system
If your old thermostat is labeled 120V or 240V or has thick wires with wire nuts, your system is high voltage. Not sure? Contact support.

Google Nest ‎T3 Learning Thermostat 3rd Gen 5

Remove any jumper wires
Jumper wires are short wires between two connectors. You won’t need them. An R wire can go into either RC or RH.

Google Nest ‎T3 Learning Thermostat 3rd Gen 6

Label wires
Peel off the labels below and attach them to the thermostat’s matching wires. Use the white labels for W3, E, HUM, or DEHUM wires. The connector can only connect to one of these wires. See two names for each connector on your old thermostat’s backplate. Visit nest for help.

Google Nest ‎T3 Learning Thermostat 3rd Gen 7

Disconnect wires and remove the base
After removing the base, we recommend gently wrapping the wires around a pen or pencil to ensure they don’t fall back into the hole in the wall.

Google Nest ‎T3 Learning Thermostat 3rd Gen 8

Mark where the screws will go
Use the bubble level to make sure the Nest Thermostat is level.

Google Nest ‎T3 Learning Thermostat 3rd Gen 9

Use trim plate if needed
You can cover up holes or marks left by your old thermostat with the optional trim plate. Snap the base and trim plate together, then screw them to the wall. You’ll find the trim plate at the bottom of the box.

Google Nest ‎T3 Learning Thermostat 3rd Gen 10

Mounting on an electrical box
Electrical boxes aren’t common, but if you have one, secure the steel plate to the electrical box with two of the short steel plate screws. Insert the screws into the long slots on the steel plate. Use the other two short screws to attach the Nest base and trim plate to the steel plate.

Google Nest ‎T3 Learning Thermostat 3rd Gen 11

Attach the Nest base
Pull the wires through the center of the base, then attach it to the wall with the screws.

Google Nest ‎T3 Learning Thermostat 3rd Gen 12

Connect wires
After all the wires are securely connected, push them down to make sure they’re flush with the base.

Google Nest ‎T3 Learning Thermostat 3rd Gen 13

Attach the display
Press the display onto the base until it clicks.

Google Nest ‎T3 Learning Thermostat 3rd Gen 14

Switch the power back on

Google Nest ‎T3 Learning Thermostat 3rd Gen 15

Setup and Nest Account
The Nest Thermostat will turn on and walk you through setup. Just turn the ring and press to select. During setup, you can connect the thermostat to Wi-Fi. Go to Nest account or download the Nest app to create a Nest Account. The app will show you how to connect your Nest Account and thermostat.

Google Nest ‎T3 Learning Thermostat 3rd Gen 16

Limited Warranty


Nest Labs, Inc. (“Nest Labs”), 3400 Hillview Avenue, Palo Alto, California USA, warrants to the owner of the enclosed product that the product contained in this box (“Product”) will be free from defects in materials and workmanship for two (2) years from the date of delivery following the original retail purchase (the “Warranty Period”). If the Product fails to conform to this Limited Warranty during the Warranty Period, Nest Labs will, at its sole discretion, either (a) repair or replace any defective Product or component; or (b) accept the return of the Product and refund the money paid by the original purchaser for the Product. Repair or replacement may be made with a new or refurbished product or components, at Nest Labs’ sole discretion.

If the Product or a component incorporated within it is no longer available, Nest Labs may, at Nest Labs’ sole discretion, replace the Product with a similar product of a similar function. This is your sole and exclusive remedy for breach of this Limited Warranty. Any Product that has either been repaired or replaced under this Limited Warranty will be covered by the terms of this Limited Warranty for the longer of (a) ninety (90) days from the date of delivery of the repaired Product or replacement Product, or (b) the remaining Warranty Period.

This Limited Warranty is transferable from the original purchaser to subsequent owners, but the Warranty Period will not be extended in duration or expanded in coverage for any such transfer.

Suppose you are the original purchaser of the Product and you are not satisfied with this Product for any reason. In that case, you may return it in its original condition within thirty (30) days of the original purchase and receive a full refund.

This Limited Warranty does not cover the following (collectively “Ineligible Products”): Products marked as “sample” or “Not for Sale”, or sold “AS IS”; or Products that have been subject to:

  • modifications, alterations, tampering, or improper maintenance or repairs.
  • handling, storage, installation, testing, or use not by the User’s Guide or other instructions provided by Nest Labs.
  • abuse or misuse of the Product.
  • breakdowns, fluctuations, or interruptions in electric power or the telecommunications network.
  • Acts of God, including but not limited to lightning, flood, tornado, earthquake, or hurricane.

This Limited Warranty does not cover consumable parts, including batteries, unless damage is due to defects in materials or workmanship of the Product, or software (even if packaged or sold with the product). Nest Labs recommends that you use only authorized service providers for maintenance or repair. Unauthorized use of the Product or software can impair the Product’s performance and may invalidate this Limited Warranty.

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FAQS About Google Nest ‎T3 Learning Thermostat 3rd Gen

What is the Google Nest Learning Thermostat 3rd Gen?

The Nest Learning Thermostat 3rd Gen is a smart thermostat designed to learn your heating and cooling preferences and automatically adjust them to save energy while keeping your home comfortable.

How does the Nest Learning Thermostat work?

It uses built-in sensors, algorithms, and your usage patterns to create a personalized schedule. It can also be controlled remotely via the Nest app.

What are the key features of the Nest Learning Thermostat?

Key features include auto-schedule, which learns your preferred temperatures and schedule, auto-away, which adjusts the temperature when you’re not home, energy history tracking, and compatibility with voice assistants like Google Assistant and Alexa.

Is the Nest Learning Thermostat compatible with my HVAC system?

The Nest Learning Thermostat is compatible with most heating and cooling systems, including gas, electric, forced air, heat pump, radiant, oil, hot water, solar, and geothermal systems.

Can I install the Nest Learning Thermostat myself?

Installation is relatively straightforward for those with some DIY experience. However, professional installation is recommended for complex systems or for those unfamiliar with HVAC wiring.

Does the Nest Learning Thermostat save energy?

Yes, it is designed to help you save energy and reduce utility bills by automatically adjusting temperatures based on your habits and preferences.

Can I control the Nest Learning Thermostat remotely?

Yes, you can control the thermostat remotely using the Nest app on your smartphone or tablet from anywhere with an internet connection.

Does the Nest Learning Thermostat work with other smart home devices?

Yes, it is compatible with a wide range of smart home devices and platforms, including Google Assistant, Amazon Alexa, Samsung SmartThings, and more.

Is the Nest Learning Thermostat customizable?

Yes, you can customize settings such as temperature preferences, scheduling, and energy-saving features through the Nest app or directly on the thermostat itself.

Is the Nest Learning Thermostat eligible for energy-saving rebates?

Many utility companies offer rebates or incentives for installing energy-efficient smart thermostats like the Nest Learning Thermostat. Check with your local utility provider for details on available programs.

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