9 Smart Thermostats You Can Install Without a C Wire

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Smart thermostats are incredibly convenient, allowing group to automate their home's heating and cooling system.

The expertise to link your home's thermostat to a Wi-Fi relationship intends you tin power your smart thermostat from anywhere, moreover if you aren't astatine home. This not only allows you to schedule nan correct somesthesia for your situation but besides helps you prevention costs connected your power bill. It's nan cleanable measurement to commencement building a smart location arsenic galore smart thermostats connection integration pinch different products for illustration locks, cameras, and more.

When looking for nan champion smart thermostats, it's important to understand whether you request to acquisition a smart thermostat pinch aliases without a C wire.

What Is a C Wire?

The C ligament (common wire) powers a smart thermostat by providing a changeless travel of 24 VAC (volts AC).

The word "constant flow" is nan cardinal here, because nan C ligament isn't nan root of power. The R wires are nan existent root of power, but they are not continuous, hence nan usage of nan C wire.

However, not each location wiring consists of a C wire. The bully news is, some of nan champion smart thermostats do not require nan powerfulness from nan C ligament to work.

In fact, immoderate of nan champion smart thermostats for illustration nan Google Nest Thermostat person nary request for nan C ligament arsenic they incorporate rechargeable batteries aliases different exertion that removes nan request for one. Here's a look astatine immoderate of nan best.

1. Google Nest Thermostat

google nest smart thermostat

Google's Nest Thermostat is simply a elemental smart thermostat that uses a rechargeable lithium-ion battery. This bypasses nan request for nan C wire, offering an always-on show that specifications nan existent somesthesia setting.

Compatible pinch astir sound assistants for illustration Google Assistant and Amazon Alexa, nan Google Nest Thermostat tin beryllium adjusted easy utilizing sound commands, aliases via nan useful smartphone app.

From 1 elemental dashboard, you tin spot really overmuch power you've saved, induce different family members to power nan smart thermostat, and group somesthesia schedules successful each of your rooms.

Best of all, nan Google Nest Thermostat is incredibly easy to instal and is 1 of nan astir versatile Wi-Fi thermostats pinch nary C wire.

google nest thermostat e smart thermostat
Google Nest Thermostat E

The Google Nest Thermostat E uses a rechargeable artillery to bypass nan request of a C wire.

It's compatible pinch astir sound assistants and easy to use.


  • Simple to use
  • More affordable than nan Nest Learning thermostat
  • No C ligament required


  • Lacks much precocious features that nan Nest Learning thermostat has

2. ecobee Lite SmartThermostat

ecobee lite smartthermostat

If you're searching for a smart thermostat that you tin instal without a C wire, connected a budget, nan ecobee Lite SmartThermostat is simply a wise choice.

While it doesn't characteristic each of nan bells and whistles nan latest procreation ecobee does, it still allows you to power your heating and cooling straight from nan app. This intends you tin schedule programs efficiently.

The ecobee Lite SmartThermostat ships pinch a Power Extender Kit that allows you to bypass nan C ligament requirement.

Aside from controlling your HVAC system, this smart thermostat is mini and easy to install, making it a awesome action if you want to instal a smart thermostat without a C wire.

ecobee Lite SmartThermostat

The ecobee Lite SmartThermostat is simply a budget-friendly smart thermostat that useful pinch Amazon Alexa.

It comes pinch a Power Extender Kit included which allows you to bypass immoderate request for a C wire.


  • Affordable
  • Includes Power Extender Kit to bypass C wire
  • Controls heating and cooling


  • Not very feature-rich

3. Google Nest Learning Thermostat

google nest learning thermostat

Google's Nest Learning Thermostat is 1 of nan astir celebrated smart thermostats, and for bully reason. It's a afloat programmable thermostat that boasts sound controls, compatible pinch Alexa, and comes successful a scope of designs.

One of nan added benefits of opting for nan Google Nest Learning Thermostat is that it tin beryllium installed pinch aliases without a C wire. So if you move homes, you'll person some options available.

A connection of caution, however, is that immoderate users whitethorn acquisition issues pinch their HVAC systems owed to nan smart thermostat taking powerfulness from nan furnace power circuits to complaint up nan soul battery.

In astir cases, this won't beryllium an issue, and you'll beryllium capable to bask your feature-rich smart thermostat without a C wire.

google nest learning thermostat
Google Nest Learning Thermostat

Keep costs down pinch nan Google Nest Learning Thermostat which programs itself to nan correct somesthesia for your home.

Using nan smart thermostat aliases nan Nest app, you tin power your heating and cooling, create schedules, and activate features for illustration Home/Away assist.


  • Plenty of precocious features
  • Can observe erstwhile you're not astatine location and set nan heating accordingly
  • Learns from your routine

4. Sensibo Sky

sensibo entity smart thermostat without c wire

For those that don't person a cardinal heating strategy aliases want to power conscionable their AC units, nan Sensibo Sky is an fantabulous smart aerial conditioner system.

With speedy and easy installation, nan Sensibo Sky doesn't require a C ligament to beryllium capable to power your AC units. You tin link nan smart strategy via Wi-Fi to power it via nan smartphone app.

Alternatively, usage sound assistants for illustration Apple's Siri, Google, and Amazon Alexa to power your home's temperature.

By leveraging nan Sensibo Sky's smart features, you tin prevention power and trim your bills pinch scheduling and geo-fencing.

sensibo entity smart thermostat without c wire
Sensibo Sky

The Sensibo Sky is an affordable action for users without a cardinal heating aliases cooling system.

This smart aerial conditioner strategy useful pinch Google Assistant, Amazon Alexa, and Siri.


  • Budget-friendly
  • Quick installation
  • Connects pinch galore sound assistants


  • No cardinal heating control

5. Lux GEO-WH Wi-Fi Thermostat

lux geo thermostat

While not nan astir stylish smart thermostat, nan Lux GEO-WH Wi-Fi Thermostat is simply a safe stake if you've tried different smart thermostats without a C ligament that aren't compatible pinch your heating system.

It tin beryllium powered via 2 AA batteries, micro-USB, aliases C wire. This gives you aggregate options, making nan process acold much straightforward, and easy to install.

You tin programme your Lux GEO-WH Wi-Fi Thermostat via nan portion aliases done nan app pinch a Wi-Fi connection.

The only script wherever you would request a C ligament for this smart thermostat is if you wanted to usage its Alexa sound power capabilities.

lux geo thermostat
Lux GEO-WH Wi-Fi Thermostat

This affordable smart thermostat useful pinch Amazon Alexa and is compatible pinch galore systems.

Powered by AA batteries, the Lux GEO-WH Wi-Fi Thermostat doesn't require a C wire.


  • Easy to install
  • Can beryllium powered aggregate ways
  • Controllable via nan portion aliases app


  • Alexa sound power requires a C wire

6. Emerson Sensi

emerson sensi inexpensive smart thermostat without c wire

One of nan astir affordable smart thermostats you tin instal without a C ligament is nan Emerson Sensi Wi-Fi Smart Thermostat. It useful pinch Alexa and boasts DIY installation.

For astir applications, nan C ligament isn't required. You'll only request a C ligament if you person a power aliases cool-only system, power pump, aliases you want to usage Apple HomeKit.

Using Wi-Fi connectivity, nan Emerson Sensi's dated style tin easy beryllium overlooked successful favour of its easy controls, allowing you to programme your home's heating from anywhere.

It's compatible pinch iOS and Android and displays usage reports truthful you tin support connected apical of your power usage.

A complete position of Sensi™ smart thermostat
Emerson Sensi


  • DIY installation
  • Amazon Alexa compatible
  • Produces power usage reports


  • Apple HomeKit requires C wire

7. Mysa Thermostat

Mysa Thermostat Image Credit: Amazon

The Mysa Smart Thermostat stands retired owed to its mid-range value and its stylish design. This statement voltage thermostat has been designed to activity pinch statement voltage heating systems for illustration baseboard heaters, fan-forced heaters, and convectors.

A C ligament is not required for installation, and, erstwhile installed, nan Mysa Smart Thermostat boasts a bully scope of features, contempt small accusation being displayed connected nan sheet itself.

Built-in, location are humidity and somesthesia sensors; erstwhile connected to a smart hub, it tin consciousness nan extracurricular somesthesia and set your heating accordingly. There are besides scheduling functions, routines nan thermostat tin learn, and geofencing.

This smart thermostat is easy to instal successful a matter of minutes. And, arsenic good arsenic being capable to power your heating via nan app, it's compatible pinch Alexa, Google Assistant, and Apple HomeKit too.

An image showing nan complete Mysa Smart Thermostat
Mysa SmartThermostat


  • Stylish and modern design
  • Feature-rich
  • Works pinch statement voltage heating systems


  • Design intends constricted accusation is displayed

8. Wyze Smart Thermostat

Wyze Smart Thermostat Image Credit: Amazon

Like nan Google Nest Learning Thermostat, nan Wyze Smart Thermostat tin beryllium installed pinch aliases without a C wire. As it isn't battery-powered, a C ligament would usually switch nan power. However, without a C wire, you tin usage nan powerfulness adapter that's included.

This thermostat useful pinch nan mostly of heating systems, but you tin usage Wyze's Thermostat Compatibility Checker to beryllium judge your strategy is compatible.

Using nan app, you tin power nan Wyze Smart Thermostat wherever you are. This includes 7-day scheduling, home/sleep/away modes, usage tracking, and more. And, if you're distant from location and person a impermanent housesitting for you, you tin stock nan power pinch your guests done nan Wyze app.

Thanks to nan built-in mobility sensor, this smart thermostat tin beryllium programmed to automatically move connected aliases off. Similarly, it tin usage your phone's location to observe if you're not astatine home.

Wyze Smart Thermostat

The Wyze Smart Thermostat useful pinch a wide scope of heating systems. You tin power nan instrumentality utilizing nan app, nary matter wherever you are.

From scheduling to power usage tracking, you tin retrieve useful accusation to prevention connected your power bills.


  • Affordable
  • Compatibility checker earlier purchase
  • Plenty of modes


  • Not compatible pinch Apple HomeKit

9. Honeywell Home T9

Honeywell Home T9 Image Credit: Amazon

The Honeywell Home T9 smart thermostat tin activity pinch aliases without a C wire. Similar to nan Wyze Smart Thermostat, nan T9 comes pinch a C ligament powerfulness adapter that you tin usage successful replacement of a C wire.

Compatible pinch room sensors that observe nan somesthesia of each room, this smart thermostat tin respond automatically to your schedule. You will beryllium capable to spot each room's somesthesia and humidity, which you tin spot successful nan mobile app.

If you for illustration to enactment connected apical of nan power you're using, you'll get a monthly power study on pinch tips connected really to trim your power usage.

And though nan Honeywell Home T9 is astatine nan precocious extremity of nan value scale, it is incredibly useful and a semipermanent finance for your home. Plus, it's compatible pinch Alexa, Google Assistant, and Apple HomeKit, truthful you tin opportunity "Alexa, group nan somesthesia to 72".

Honeywell Home T9

The Honeywell Home T9 has plentifulness of features that let you to enactment connected apical of your power usage.

You tin usage it pinch aliases without a C wire, utilizing nan included powerfulness adapter.


  • Includes C ligament powerfulness adapter
  • Compatible pinch room sensors
  • Monthly power reports

No C Wire—No Problem

Buying a smart thermostat that doesn't require a C ligament for installation doesn't mean you're successful for a mediocre experience.

In fact, immoderate of nan astir precocious and celebrated smart thermostats for illustration nan Google Nest Learning Thermostat are among those that tin beryllium installed without a C wire.

Now it's easier than ever to support an oculus connected your spending and power your power usage utilizing smart technology.

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