Nest Learning Thermostat advanced installation and setup help for professional installers

Here are advanced setup tips for our professional installers as well as information about our Nest Pro support, extended warranty for pros, returns and more.

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Nest Pro services

Installation overview

Installation help

Setup help

Returns help

Nest Pro services

How do I access the Nest Pro website?

Use a web browser on a computer, phone or tablet to go to Click or tap on the Log in/Sign up link near the
top of the screen and enter your email and password. Once
you’re logged in, you’ll be able to:

  • See your customer referrals
  • Shop in the Nest Pro Store (pro-only pricing)
  • Download or order printed marketing materials for your business
  • Access Pro support articles

Note: If you’re currently logged into another Nest Account (for
instance a customer’s account for troubleshooting), you may be
automatically logged into the Nest Pro site with their email and
password. No problem, simply tap or click Log out near the top
of the screen to clear their information. You can then enter your own email and password.

Nest app Nest pro home

Don’t remember your email or password? Simply tap or click Forgot password on the login screen to reset your password. If you have a manager, they may have set up the account for your company as an administrator, so you won’t be able to reset the login information. Contact your manager to get the login information for your business. We can also help you with access. See the VIP Pro support section below.

How can I offer my customers
the Extended Pro Warranty for
the thermostat?

Nest Pros can now offer their customers a three year
warranty extension on the 3rd generation Nest Learning
Thermostat, for a total of five years. Only thermostats
that are sold and installed by Nest Pros in the US and
Canada qualify for the extension.

Important: To activate the warranty for your customer,
you must select the Pro Setup option when setting up the thermostat and enter
your Nest Pro ID. If you don’t, the three year extension won’t be added to the two
year standard warranty.

thermostat enter nest pro id

Learn more about the Extended Pro Warranty >

Where can I find my Nest Pro ID number?

After you’ve logged into the Nest Pro website,
your personal Nest Pro ID number will appear near the top of the screen next to your name.
nest pro portal

You’ll need your Nest Pro number if you want to enter your contact information on a Nest Thermostat so your customer can get in touch if needed. The thermostat will automatically get your contact information from your Nest Pro ID. You’ll also be asked to enter your Nest Pro ID when you use Pro Setup to install a Nest Thermostat.

If you ever need to change the Pro contact information after initial setup, go to SETTINGS > NEST PRO and select CHANGE.

Learn more about adding your contact information >

How do I get VIP Pro support?

You can contact our Nest Pro Support Team via email or by phone. Turnaround for emails is very fast, so it’s great if you have a quick question. You can reach us at If you have a detailed question please call us at 855-847-6378.


Installation overview


Watch the installation video for the 3rd generation Nest Learning Thermostat


How to install the 3rd gen Nest Learning Thermostat

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Watch the installation video for the 2nd generation Nest Learning Thermostat



How to install the 2nd gen Nest Learning Thermostat

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How can I tell the difference between the 3rd, 2nd and 1st generation of the Nest Learning Thermostat?

There some key differences between each generation of Nest Thermostat. Here’s how to tell which one you’re dealing with.

The first generation Nest Thermostat was announced on October 25, 2011. The 2nd gen thermostat was announced on October 2, 2012, and the 3rd gen on September 1, 2015.

The 2nd and 3rd gen Nest Learning Thermostats have more wire connectors for increased compatibility and an updated design. There are two easy ways to tell the difference between each Nest Thermostat generation. Simply look at the display or the base.

Note: All 1st gen Nest Thermostats have the wire connectors
in straight rows. However, in April 2012 the wire connectors
were upgraded for easier installation, so 1st gen thermostat bases made
before then will look like the one to the right.
thermostat base image
3rd generation 2nd generation 1st generation
3rd gen thermostat 2nd gen thermostat 1st gen thermostat


gen 3 thermostat backplate gen 2 thermostat gen 1 thermostat
3.25 inch screen diameter 2.75 inch screen diameter 2.75 inch screen diameter
Seamless all-steel ring Seamless all-steel ring Visible seam in ring
Slimmest profile Slimmer profile Thicker profile
Blue bubble level on top Yellow bubble level on bottom Yellow bubble level on top
Curved wire connector rows Curved wire connector rows Straight wire connector rows
10 wire connectors
(has Y2 and * )
10 wire connectors
(has Y2 and *)
8 wire connectors
(no Y2 and *)

Learn more - how can I tell which Nest Thermostat I have? >

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What HVAC systems and features is the Nest Learning Thermostat compatible with?

The 2nd and 3rd gen Nest Learning Thermostats are compatible with more heating and cooling systems than the 1st generation because they have two more connectors.


2nd and 3rd generation Nest Learning Thermostat 1st generation Nest Learning Thermostat
  • Heating: 1, 2 and 3 stages (W1, W2, W3)
  • Cooling: 1 and 2 stages (Y1, Y2)
  • Heat pump: with auxiliary and emergency heat (O/B, AUX, E)
  • Humidifier or dehumidifier (HUM, DEHUM)
  • Fan (G)
  • Power (C, Rh, Rc)

The  connector can accept only one of these wires:

  • W3, E, HUM or DEHUM
  • Heating: 1 and 2 stages (W1, W2, W3)
  • Cooling: 1 stage (Y1)
  • Heat pump: with auxiliary heat (O/B, AUX)
  • Fan (G)
  • Power (C, Rh, Rc)

Learn more about the * connector >

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Installation help

Why can't jumper wires be used with the Nest Thermostat?

The Nest Thermostat's press connectors are built so that only one wire can be inserted per connector. Please don't put any jumper wires in the connectors, the Nest Thermostat doesn’t need them. For example, there is an automatic internal jumper between the Rh and Rc wires. So if both an Rh and Rc wire are put in their respective connectors, the thermostat will not jumper the connectors together. But if the system has both heating and cooling and only one R wire, the thermostat will automatically jumper the connectors together.

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What if Nest isn't getting enough power from W or Y and my customer doesn't have a Common wire installed?

We’ve found that in the vast majority of homes, the Nest Thermostat can charge its built-in battery by power sharing over the regular heating and cooling wires. Few installations require a new common wire to power the thermostat. However, if the system does have a C wire, we recommend using it.

What are the symptoms of a power sharing issue?

In conventional heating and cooling, or cooling-only systems:

  • Cooling is always on or on intermittently when Nest isn’t calling for cooling.
  • Cooling does not activate when Nest calls for cooling.
  • Cooling intermittently deactivates while Nest is still calling for cooling.

In conventional heating-only systems:

  • Heating is always on or on intermittently when Nest isn’t calling for heating.
  • Heating does not activate when Nest calls for heating.
  • Heating intermittently deactivates while Nest is still calling for heating.
  • There is an unusual noise coming from the heating system.

In heat pump systems:

  • Heating or cooling is always on or on intermittently when Nest isn’t calling for it.
  • Heating or cooling does not activate when Nest calls for it.
  • Heating or cooling intermittently deactivates while Nest is still calling for it.

In these situations, the Nest Thermostat can't successfully charge from the Y or W wires without interfering with the normal operation of the heating and cooling system. There are two options; these changes should only be made by professional installers.

Use a spare wire as common wire

Usually, you can solve power issues by turning an unused wire in the thermostat wire bundle into a common wire. Simply connect one end of the spare or unused wire to the Common terminal in the HVAC controller and the other end to Nest's C connector.

Pull a new C wire

Replace the thermostat wiring bundle to provide an extra wire to be used as common.

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What does it mean when there’s a green blinking light on the Nest Thermostat display?

When the light is blinking green, the Nest Thermostat will be unresponsive and the display will be off. When this happens, it’s doing one of the following:

  • Starting up when power to the heating or cooling system is turned back on
  • Downloading and updating software
  • Restarting

Typically, you’ll only see the green light blinking for a minute or two. If the light continues to blink and the thermostat remains unresponsive for more than 5 minutes, try removing and reconnecting the display.

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What does it mean when there’s a red flashing light on the Nest Thermostat display?

The Nest Thermostat has a rechargeable battery that gets its charge directly from the heating and cooling system. It comes charged and ready for use right out of the box. However, in some rare cases, the battery may have drained during shipping. If the battery is partially drained, the thermostat will take measures like turning off Wi-Fi, Farsight, and wake on approach, to preserve battery charge. If Wi-Fi is turned off, you won’t be able to connect the thermostat to the Internet, download software updates, or add the thermostat to a Nest Account. If the battery level gets too low, the thermostat will shut down until the battery is recharged. While recharging, the LED will blink red. Unfortunately, while it’s charging you won’t be able to control the heating and cooling system.

The Nest Thermostat will usually take about half an hour to recharge to the point where you can use it. But if the battery is very low, it can take as long as two hours. If you're in a hurry, you can remove the display and plug it into a USB charger to charge the battery more quickly. This requires a USB cable with a USB Mini B connector (1st gen Nest Thermostat) or a USB Micro B connector (2nd and 3rd gen Nest Thermostat).

Learn more >

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Help connecting humidifiers and dehumidifiers to the 2nd and 3rd gen Nest Thermostat

When you use Pro Setup, you’ll get advanced wire
configuration options that will help with more complex
systems, like ones with humidifiers. 2nd and 3rd gen Nest
Thermostats are compatible out of the box with most whole-home
humidifier and dehumidifier systems that connect to the thermostat
with one low voltage wire. On the Nest Thermostat, these wires
should be inserted into the * connector.

If the humidification or dehumidification system has two wires, you'll
need to add a relay in order for it to work with the Nest Thermostat.
If you’re connecting to unpowered terminals, you can add a 24V AC relay
suitable for HVAC equipment use. Nest recommends the White Rogers
90-290Q or similar 24V relay. Check the humidifier/dehumidifier manual for wiring requirements.

Nest thermostat star configuration

Compatible wires have one of the following labels:

  • H, Hum, Hum1, H2, Hum2
  • D, DH, Dhum, Dehum, D2, DH2, Dhum2, Dehum2

Possible configurations:

Stand Alone Humidifier, 1 Wire

  • This system has a humidifier that is separate from the HVAC system.
  • Install the hum wire directly into the Nest  connector.
  • Correctly ground the other wire from the humidifier.
  • No relay is recommended.

Wiring diagram

Stand Alone Humidifier, 2 Wire

  • This system has a humidifier that is separate from the HVAC system.
  • Install the 2 HUM wires directly into the relay.
  • Run the single wire from the relay to the Nest * connector.
  • Nest recommends the White Rogers 90-290Q or similar 24VAC HVAC relay.

Wiring diagram required relay

Built-in Humidifier System, 2 Wire

  • This system has a humidifier built in to its HVAC system and 2 separate HUM wires.
  • Install the 2 HUM wires directly into the relay.
  • Run the single wire from the relay to the  terminal at the Nest.
  • Nest recommends the White Rogers 90-290Q or similar 24VAC HVAC relay.

Thermostat humidifier wires

Built-in Humidifier System, 1 Wire

  • This system has a humidifier built in to its HVAC system and only 1 hum wire.
  • Connect the HUM wire from the built-in system directly to the  terminal at the Nest.
  • No relay is recommended.

Thermostat humidifier wires

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Setup help

What is Pro Setup and what are the advantages?

When going through setup on the Nest Learning Thermostat, the
first question in the Equipment section asks if you’re a Homeowner
or Pro. Selecting Pro will take you through Pro Setup, which has
additional options to help professional installers set up more complex systems.

In Pro Setup, you can configure advanced settings such as alternate
and primary heating sources, lock out temperatures, fan activation, and more.
Pro Setup is required to set up dual fuel systems (such as a heat pump
with furnace) as well as whole-home humidifiers and dehumidifiers.

are you a pro? thermostat image

TIP: Homeowner setup can be used as a shortcut if the heating and cooling system isn’t complex (examples include a conventional heating and cooling system or heat pump with auxiliary heat). However, if you choose Homeowner, you won’t be able to enter your Nest Pro ID and activate the extended warranty for your customer (it can’t be done after setup is complete), so we recommend that you use Pro Setup.

Using Pro Setup after installation

If you need to access Pro Setup after the Nest Thermostat has
been initially set up, go to SETTINGS > EQUIPMENT on the thermostat.
You’ll see an Equipment Detected screen, then a Your System screen.
Select CONTINUE for both. Then you’ll see an Equipment Settings screen
where you can select PRO SETUP to access the Nest Thermostat’s advanced settings.

heat pump thermostat image

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How to set
Heat Pump
and AUX

heat pump thermostat image



Setting Heat Pump Balance and AUX heat lockout is done after you’ve finished with Pro Setup.

On the Nest Thermostat, go to Settings > Nest Sense > Heat Pump Balance. You can then select between comfort, savings, or a balance of the two.

Learn more about Heat Pump Balance >

How to set AUX lockout temperatures





On the thermostat, go to SETTINGS > EQUIPMENT      

Nest thermostat settings






At the Equipment detected screen, select CONTINUE.

thermostat equipment detected image




Next, confirm the system configuration is                     
accurate, and select CONTINUE.

Thermostat your system page





At Equipment Settings - Select HEAT PUMP.                

heat pump thermostat image





Set the Heat Pump orientation.                                      

Thermostat O wire or B wire screen




Set the compressor lockout temperature. You .         
can specify a temperature or set it to always.

Thermostat outdoor message





Confirm that AUX controls an auxiliary heater.          

confirm auxiliary heat image





Set the temperature that you want to engage           
AUX heating and press the ring to enter it.

Thermostat outdoor temperature message


Using Nest Sense Heat Pump Balance to automatically control AUX usage




If you don't know which temperatures
you should use with your system, go to

               Nest thermostat Nest sense settings





Then select Heat Pump Balance from the menu.   

Nest thermostat heat pump balance

This lets you manage your AUX heat based
on your preference for maximum savings,
a balance between savings and comfort,
or maximum comfort.

NOTE: This should be set to OFF if you want
to manually enter the temperature.

         thermostat balance image

How to set AUX lockout and ALT temp. after initial setup

Setting the AUX lockout temperature will be part of the Pro Setup if you chose a Heat Pump during setup. If you chose Dual Fuel you’ll set the ALT temperature.

Set AUX lockout on a single fuel system

To set AUX lockout on a single fuel system, Heat Pump Balance must be set to OFF, otherwise you won’t see the AUX lockout option in the thermostat’s settings. Here’s how to set the AUX lockout after initial Nest Thermostat setup has been completed.




Go to the Settings menu, and select Equipment.

Nest thermostat settings
Select CONTINUE on the Equipment Detected       
and Your System screens.
Your system screen
  heat pump thermostat image
On the Equipment Settings screen,
select HEAT PUMP. Then you can select the .        
lockout temperature.
heat below thermostat image

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Setting the ALT temperature on a dual fuel system

To set ALT temperature on a dual fuel system, alternate heat must be set to PRIMARY in the thermostat’s settings. Here’s how to set the temperature if you’re changing it after initial setup:




wiring diagram is correct and press CONTINUE,
then press CONTINUE again

Nest thermostat settings




Verify the equipment detected and wiring is           
correct for your system.




Verify the system configuration summary is          
correct and select continue.

Your system screen




Select Dual Fuel.                                                          

thermostat duel fuel image





Select the desired alternate heat temperature.     

Thermostat outdoor temperature message





Select Done.                                                                

Nest thermostat settings done

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Learn more setting up complex systems with Pro Setup >

What is System Match?

The Nest Thermostat senses what wires are connected to it and if there's voltage on those wires. During setup, just confirm the wires you've installed and Nest System Match will automatically configure its software and enable different features for forced air, heat pumps with auxiliary heat, and radiant systems.

For instance, if it’s a heat-only system, the Nest Thermostat won't show any cooling options or settings. If the system is a two-stage furnace, the thermostat will enable second stage heating features.

For conventional heating systems, the Nest Thermostat will ask you about the heating fuel source (gas, electric, oil, propane (LP), or geothermal) and the type of heating (forced air, in-floor radiant, or radiators).

If you make a change to the heating and cooling system after initial setup (like add cooling to a heating-only system), there is no need to restart or reset the thermostat. Just connect the new wires to the Nest Thermostat while the power is off to the system. When you turn the power back on, the thermostat will sense the new wires and confirm there has been a change. Press the thermostat ring to continue, and you’ll see the Equipment Settings screen where you can configure the thermostat to control the new equipment.

Learn more about System Match >

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Returns help

How do I return a Nest Thermostat?

Returning a Nest Thermostat is simple. If you purchased it through a distributor, just take it back to them. You may need a copy of your purchase order and/or your Nest Pro number. If you purchased the thermostat from us on the Pro store, give our Pro Support Team a call. You’ll need the thermostat’s serial number to initiate a return.

How do I find the thermostat’s serial number?

There are three ways to find the thermostat's serial number: on the packaging, on the back of the thermostat display, in the Nest app, and in the thermostat’s TECHNICAL INFO menu.



If the thermostat is still in the packaging, you can find the serial number on the bottom of the box. You’ll see the label with the serial number right above the UPC code.

serial number on the box






If you or your customer has physical access to the thermostat, just pull the display off the base. The serial number is just above the QR code on the back of the display.

You can also find the serial number by going to SETTINGS > TECHNICAL INFO > DISPLAY on the thermostat.

3rd gen thermostat back view






If the thermostat has already been added to a Nest Account, you can also look up the serial number in the Nest app. Select the thermostat on the app home page, then tap the Settings icon in the top right corner. Next, tap Technical info. The serial number will be the third line in the list.

Nest app technical info


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