Asked by: Shuangshuang Utermohl
home and garden smart home

What voltage does Nest thermostat need?

Last Updated: 19th June, 2021

Common “C” wire not needed in 99% of installations. The Nest Learning Thermostat is not compatible with millivolt systems or high voltage (110V, 220V) systems. Note: Before you install Nest, watch the installation video at

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Hereof, does Nest thermostat require power?

In most cases, a Nest Thermostat can work without a common wire. Without a common wire it charges its internal battery using power from the heating and cooling wires. With some HVAC systems, such as micro-controller-based systems and certain gas valves, will require a C-wire to work with Nest Learning Thermostat.

Also Know, do I use RH or RC on Nest thermostat? Here are some general guidelines: An R wire can go into a Nest Learning Thermostat's Rc or Rh connector. The Nest Thermostat E only has an R connector, which is typically where an R wire would go.

Similarly, it is asked, can you run a Nest thermostat without WiFi?

Operating the Nest Thermostat without WiFi does mean you won't be able to access the full range of the product's features, such as integration with other connected devices and the ability to control the thermostat using the mobile app, however.

Do I need 2 Nest thermostats for 2 zones?

If you currently have two thermostats controlling two zones you will want two Nest thermostats. You do not need to upgrade them both at the same time.

Related Question Answers

Crispulo Hlusov


Does Nest thermostat use batteries?

The Nest thermostat contains a rechargeable lithium ion battery. This battery runs the programming and keeps the thermostat connected to WiFi, but WiFi connectivity is draining – the battery doesn't last very long on its own. So, to keep itself going, the Nest recharges itself from your HVAC system's wiring.

Cherif Gravari


Will a Nest thermostat work with two wires?

Nest thermostats can work with systems that use Service Light (L) wires. While L wires can't be connected to the Nest thermostat, they don't need them. The Nest thermostat and Nest app will show you system status information without connecting L wires.

Gottfried Hehndel


Do Nest thermostats have cameras?

Google confirms with Business Insider that there's no microphone in any of its flagship Nest Learning Thermostat product line — but, as you may expect, there is one in all of its home security devices, including the Nest Cam camera and Nest Hello doorbell product lines.

Amadeu Yagues


How does Nest Thermostat get power?

Nest Owners Not Exempt
Without a C-wire, the Nest gets its power from your heating or cooling system… assuming it's running. When it's not running, the Nest still needs to get power. The Nest will “pulse” the heat wire, turning on the furnace to pull a bit of power to keep itself going.

Aleksandrina Matarranz


Jiacheng Langlechner


How long does Nest thermostat battery last without power?

The Nest Learning Thermostat comes with a rechargeable lithium-ion battery that keeps it functioning typically for one to two hours during power outages before it completely shuts down. However, your Thermostat will no longer be “smart” as long as it's running on the low battery.

Valeriya East


Can I install Nest myself?

It's easy to install a Nest thermostat yourself on most systems. But if you'd like some help, you can have a Nest Pro install your thermostat. After they've installed your Nest thermostat, they can give you a demo and answer any questions you have.

Messaouda Bersani


How do I know if my thermostat has power?

How to Check If Power Is Getting to My Thermostat?
  1. Check the circuit breaker. Go to your breaker box and look for the breaker that powers the furnace or air conditioner.
  2. Check the power switch. There is power switch on the side of the HVAC unit.
  3. Change the batteries in the thermostat.
  4. Test the power wire to the thermostat.

Suhaib Frasca


How does a low voltage thermostat work?

Low-voltage thermostats are powered by a transformer that reduces the incoming line voltage from 120 volts down to a level between 12 and 24 volts, depending on your furnace design.

Teofila Goycochea


Is 24 VAC low voltage?

24VAC is definitely low voltage.

Yunaida Zhunusov


Is a thermostat AC or DC voltage?

Heating or cooling room thermostat voltage levels & power sources: where does a wall thermostat get its electrical power & what voltage level is usually required. While most thermostats use a 24V DC circuit, some use different voltage levels and / or 120V AC is used by line voltage thermostats.

Jaye Latrach


How does a line voltage thermostat work?

How Line Thermostats Work. Line thermostats turn on and off electric baseboard heaters. You see, the low voltage circuits pull in a relay that completes the furnace circuit, whereas this thermostat breaks and makes the circuit that directly feeds the furnace.

Angharad Planaguma


How do I stop nest from changing temperature?

Google Nest Thermostat - Turn Off Google Nest Smart Features
  1. Open the Google Nest app on your smartphone.
  2. Select your thermostat.
  3. Select the Mode option in the lower left and set the mode to Heat/Cool.
  4. Select the Eco option in the lower center and end Eco Temperatures on all thermostats.

Tess Aragoneses


How does Nest thermostat connect to heat link?

If you choose to use the Nest Stand, your thermostat will only use the wireless Thread network to communicate with the Heat Link. If your Nest thermostat is installed on the wall and connected to your old thermostat's wires, it will use both the wires and wireless Thread to communicate with the Heat Link.

Kandela Davidyants


Why is there a jumper between RH and RC?

Effectively there isn't a second RH wire, although there is an RH terminal. However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat.

Elcy Sruthi


How do I set my Nest thermostat to hold temperature?

On your thermostat:
  1. Go to the schedule screen on your thermostat.
  2. 1st, 2nd and 3rd gen Nest Learning Thermostat: Press the ring and choose Schedule .
  3. Nest Thermostat E: Press the ring and choose Settings Schedule.
  4. Create or adjust temperature set points to your liking.

Harminder Queipo


Why is there a jumper between R and RC?

Rc and R are the same terminal. For nest you don't need a jumper. The reason for the 2 terminals is so you can use one thermostat for 2 types of units. Rc is for the indoor air handler when you run the AC.

Carry Lasar


Is RC the same as C wire?

Though it is a common notion, it may be incorrect to state that the C-wire powers the thermostat. Typically, the wires that give the power supply (usually termed as the 'hot' wires) are marked Rc (for cooling) and Rh (for heating). They give a 24-volt power supply from the HVAC system's control panel.