Best 2 Wire Smart Thermostat for 2023

We have compiled a list of the best 2 wire smart thermostats available on the market for you to choose from. 

These thermostats are perfect for those who have a 2 wire heating or cooling system in their homes and want to upgrade to a smart thermostat without the need for additional wiring. 

With these thermostats, you can control your home’s temperature remotely, set schedules, and save on energy bills. 

We have tested and reviewed these products to ensure that they meet our standards for reliability, ease of use, and functionality. 

Best 2 Wire Smart Thermostats 2023

1. Sensi Touch 2 Smart Thermostat

Sale
Sensi Touch 2 Smart Thermostat with Touchscreen Color Display, Programmable, Wi-Fi, Data Privacy,...
  • WORKS WITH ROOM SENSORS: Compatible with Sensi Room Sensors to balance temperatures throughout your home (sold separately)
  • PRIVACY PROTECTION: Sensi won’t sell your personal information to third parties
  • SAVE ABOUT 23% ON HVAC ENERGY*: The ENERGY STAR-certified Sensi Touch 2 smart thermostat can help you save energy with...
  • EASY DIY INSTALLATION: Top-rated app guides you through each step of the install using universal Bluetooth technology for...

The Sensi Touch 2 is an excellent choice if you want a smart thermostat that is both dependable and simple to operate.

The Sensi Touch 2 is a reliable and energy-efficient smart thermostat that can help you save money on your energy bills. 

With its easy installation process and intuitive app, you can control your home temperature from anywhere, customize your heating and cooling preferences, and balance temperatures throughout your home with room sensors. 

However, the C-wire requirement and potential Wi-Fi connectivity issues may be a concern for some users.

Pros

  • The Sensi Touch 2 is very easy to install with its top-rated app guiding you through each step of the process.
  • You can control your home temperature from anywhere with the intuitive app, which also allows you to schedule and customize heating and cooling based on your preferences.
  • The Sensi Touch 2 works with room sensors to balance temperatures throughout your home, saving you money on your HVAC energy usage.

Cons

  • A C-wire is required for installation, which may not be compatible with all HVAC equipment found in homes.
  • Some users have reported issues with Wi-Fi connectivity, which can cause the thermostat to disconnect from the app and stop working properly.
  • The Sensi Touch 2 no longer supports Apple HomeKit, which may be a disappointment for some users.

2. EMERSON Sensi Touch Wi-Fi Smart Thermostat

Sale
EMERSON Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, Works with Alexa, Energy...
  • EDITORS CHOICE BEST OVERALL SMART THERMOSTAT by USA Today’s reviewed.com.SMART MAINTENANCE: Sensi can help monitor the...
  • SAVE ABOUT 23% ON HVAC ENERGY*: By adjusting the temperature using flexible scheduling, remote access, and geofencing, Sensi...
  • MOST INSTALL IN 30 MINUTES OR LESS**: Use the built-in level, illuminated easy-click terminals and step-by-step app...
  • SMART HOME COMPATIBLE: Works with Amazon Alexa, Google Assistant, Apple HomeKit, and Samsung SmartThings smart home...

The EMERSON Sensi Touch Wi-Fi Smart Thermostat is an excellent option if you are looking for a user-friendly and efficient smart thermostat.

EMERSON Sensi Touch Wi-Fi Smart Thermostat is a great product that can help you save energy and money. It is easy to install, and you can control it from anywhere using your smartphone or tablet. You can also integrate it with popular smart home platforms, making it more convenient to use.

One of the best things about EMERSON Sensi Touch Wi-Fi Smart Thermostat is that it can help you save up to 23% on HVAC energy usage. 

By adjusting the temperature using flexible scheduling, remote access, and geofencing, you can reduce your energy bills without sacrificing comfort.

EMERSON Sensi Touch Wi-Fi Smart Thermostat is easy to install. With the built-in level, illuminated easy-click terminals, and step-by-step app instructions, most people can install it in 30 minutes or less. Installing it requires no special tools or skills.

EMERSON Sensi Touch Wi-Fi Smart Thermostat is also compatible with popular smart home platforms, including Amazon Alexa, Google Assistant, Apple HomeKit, and Samsung SmartThings. You can control it using your voice or the mobile app, making it more convenient to use.

However, EMERSON Sensi Touch Wi-Fi Smart Thermostat has some drawbacks. Some users may find it imprecise because it only adjusts in full degrees.

Auto mode does not heat or cool until the temperature is 2 degrees Celsius above or below the set temperature. Also, it doesn’t have a humidity sensor, which may be important for some users.

Pros

  • You can save up to 23% on HVAC energy usage.
  • It is easy to install, and most people can install it in 30 minutes or less.
  • It is compatible with Amazon Alexa, Google Assistant, Apple HomeKit, and Samsung SmartThings smart home platforms.

3. Honeywell Home T9 Smart Thermostat Bundle

Honeywell Home RCHT9510WF T9 Wi-Fi Smart Thermostat + RCHTSENSOR-2PK Smart Room Sensor (2-Pack)
  • This bundle includes one Honeywell Home RCHT9510WF T9 Smart Thermostat and two Honeywell Home RCHTSENSOR Smart Room Sensors.
  • LIVE AND SLEEP SMARTER. Choose the temperature in a specific room, like the bedroom, to be exactly what you want it to be, to...
  • AMAZING SENSOR RANGE. The battery powered Smart Room Sensors utilize unique Honeywell Home technology to deliver an efficient...
  • MULTI-ROOM FOCUS. Don’t be forced to choose one room over another, the T9 Smart Thermostat and Smart Room Sensors can...

If you’re looking for a smart thermostat that can handle multiple rooms, the Honeywell Home T9 Smart Thermostat Bundle might be for you. 

With its Smart Room Sensors, you can adjust the temperature in a specific room or let the sensors automatically detect which rooms people are in and focus comfort where it matters.

The Honeywell Home T9 Smart Thermostat Bundle is a great option for those who want to control the temperature in multiple rooms.

With its Smart Room Sensors, you can choose the temperature in a specific room, like the bedroom, to help get a better night’s sleep. 

Or let the sensors automatically detect which rooms people are in and focus comfort where it matters.

Depending on home construction, the Smart Room Sensors have an incredible range of up to 200 feet.

This means you can put them wherever you want and still get a good signal. Furthermore, the T9 Smart Thermostat and Smart Room Sensors can focus on multiple rooms, so you do not have to choose between them.

However, before purchasing, make sure that this thermostat is compatible with your home and that you need a C-wire power adapter. Furthermore, the battery-powered Smart Room Sensors may require frequent battery replacements, which could be inconvenient.

Pros

  • The Smart Room Sensors have an amazing range of up to 200 ft, depending on home construction.
  • The T9 Smart Thermostat and Smart Room Sensors can handle multiple rooms to focus on.
  • Compatible with Forced air (gas, oil or electric), hot water and steam, and heat pumps with electric backup.

Cons

  • Does NOT work with electric baseboard heat (120-240V).
  • Before purchasing, check to see if this thermostat is compatible with your home and to determine if your home needs a C-wire power adapter.
  • The battery-powered Smart Room Sensors might require frequent battery replacements.

4. Honeywell THX321WFS2001W 

Honeywell THX321WFS3001W (T10 Pro Smart Thermostat Kit in White) Bundled with C7189R2002-2 Two Pack...
  • This bundle brings three wireless sensors and you can add up to a total of 20 wireless sensors - Temperature, humidity and...
  • Prioritize for comfort the areas that are occupied or the areas that matter to you ; dens in the evening ; bedrooms at night...
  • Needs a C wire but you can place the thermostat at the furnace or air handler where there is a C wire for sure and control...
  • Resolves problems of thermostats installed in bad locations that sense a temperature that is not representative of the...

If you want to prioritize the comfort of different areas of your home, the Honeywell THX321WFS2001W (T10 Pro Smart Thermostat Kit) is a great choice. 

This thermostat comes with wireless sensors that detect temperature, motion, and humidity, so you can direct your comfort to the areas that matter to you. 

The Honeywell THX321WFS2001W (T10 Pro Smart Thermostat Kit) is a great choice if you want to prioritize the comfort of different areas of your home. The wireless sensors detect temperature, motion, and humidity, so you can direct your comfort to the areas that matter to you. 

The advanced app allows you to integrate with Apple Home Kit and uses geo-fence technology to automatically adjust the temperature as you approach your home.

However, it would help if you had a C wire to install this thermostat, which is not compatible with all HVAC systems.

Pros

  • The bundle brings three wireless sensors and you can add up to a total of 20 wireless sensors – Temperature, humidity, and motion (presence of humans!!).
  • Prioritize for comfort the areas that are occupied or the areas that matter to you; dens in the evening; bedrooms at night; living rooms when you are entertaining.
  • It allows homeowners to prioritize spaces in their house where they want to direct their comfort. Select different rooms at different times of the day based on your usage.

Cons

  • Needs a C wire but you can place the thermostat at the furnace or air handler where there is a C wire for sure and control the temperature based on one or several of the remote sensors.
  • Resolves problems of thermostats installed in bad locations that sense a temperature that is not representative of the area(s) you want to be comfortable!!
  • It is not compatible with all HVAC systems.

5. ecobee Smart Thermostat Premium

ecobee New Smart Thermostat Premium with Smart Sensor and Air Quality Monitor - Programmable Wifi...
  • Save up to 26% per year on heating and cooling costs. ENERGY STAR certified. Included SmartSensor (50 dollar value) adjusts...
  • Built-in air quality monitor alerts you to poor air quality, provides tips on how to improve it, and reminds you when it’s...
  • Premium materials and advanced engineering mean a large, vibrant display with a cinematic interface, a timeless design, and...
  • ecobee Smart Thermostat Premium is a complete home monitoring hub that includes built-in smoke alarm detection and alerts to...

The ecobee Smart Thermostat Premium has all the bells and whistles you could want in a smart thermostat.

With the ecobee Smart Thermostat Premium, you can enjoy savings on your energy bills while also keeping your home comfortable.

The included SmartSensor adjusts the temperature in the rooms that matter most, eliminating hot and cold spots. Plus, the built-in air quality monitor provides helpful tips on improving the air in your home.

One downside of this product is that the built-in smoke alarm detection and alerts to possible break-ins require an ecobee Smart Security plan. If you want to use Siri with the thermostat, you’ll need an Apple home hub.

Pros

  • With ENERGY STAR certification, save up to 26% yearly on heating and cooling costs.
  • Built-in air quality monitor alerts you to poor air quality, provides tips on how to improve it, and reminds you when it’s time to change your furnace’s air filter.
  • Comes with a smart speaker and your choice of Siri or Alexa Built-in. Control your home using the power of your voice and listen to your favorite Spotify playlists and podcasts through your thermostat’s speaker.

Cons

  • ecobee Smart Security plan required for built-in smoke alarm detection and alerts to possible break-ins.
  • Apple home hub required to enable Siri on Smart Thermostat Premium.
  • The price point is higher than some other smart thermostats on the market.

6. Emerson Sensi Wi-Fi Smart Thermostat

Sale
Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified,...
  • PRIVACY PROTECTION*: Sensi won’t sell your personal information to third parties
  • SAVE ABOUT 23% ON HVAC ENERGY*: The ENERGY STAR-certified Sensi smart thermostat can help you save energy with features like...
  • EASY DIY INSTALLATION: Use the built-in level and step-by-step app instructions for a quick installation. Works with HVAC...
  • SMART MAINTENANCE: Sensi can help monitor the performance and efficiency of your HVAC system by delivering valuable usage...

The Emerson Sensi Wi-Fi Smart Thermostat is a top pick if you want a user-friendly and straightforward smart thermostat.

The Sensi smart thermostat is a great option for those looking to save energy and money on their HVAC bills. With its easy installation process and user-friendly app, you can quickly and easily adjust the temperature in your home from anywhere. 

The customer service team is also available to help you with any questions or issues you might have.

One potential downside to the Sensi smart thermostat is that some users have reported connectivity issues with the app, which can be frustrating when trying to control the temperature remotely. 

The thermostat is not compatible with all HVAC systems, so it’s important to check compatibility before purchasing. Finally, some users reported that the thermostat’s temperature readings were inaccurate.

Pros

  • The Sensi smart thermostat is designed to help you save energy and money on your HVAC bills.
  • With its top-rated mobile app and easy installation process, even those with little experience can make the switch to a Sensi smart thermostat.
  • The customer service team of HVAC experts is always available to help you through any questions you might have.

Cons

  • Some users reported connectivity issues with the app, which can be frustrating when trying to control the temperature remotely.
  • The thermostat is not compatible with all HVAC systems, so it’s important to check compatibility before purchasing.
  • Some users reported that the thermostat’s temperature readings were not always accurate.

7. iO HVAC Controls UT-SWM Universal Thermostat Smart Wire Module

If you want to save money on installation, the iO HVAC Controls UT-SWM Universal Thermostat Smart Wire Module is an excellent choice for retrofit applications.

The iO HVAC Controls UT-SWM Universal Thermostat Smart Wire Module is an innovative and low-cost solution for applications where you need up to five additional outputs but have a minimum of two wires between a thermostat and HVAC unit. 

This 2-5 wire adapter is an extremely cost-effective solution that allows installers to avoid pulling new wire in retrofit applications.

The device supports both heat pump and conventional HVAC systems, and includes a compact sender module and relay receiver module.

With a maximum range of 250 feet, the UT-SWM Universal Thermostat Smart Wire Module is compatible with virtually all major thermostat brands.

While some users have reported issues with transmission lag, this is not a common problem.

However, it’s important to note that the device is only suitable for applications with a minimum of two wires between thermostat and HVAC unit. Installation may also require professional assistance.

Pros

  • Reduces installation costs by avoiding the need to pull additional wire
  • Can send up to 5 additional outputs over a single pair of wires
  • Compatible with virtually all major thermostat brands

Cons

  • Some users reported issues with transmission lag
  • Only suitable for applications with a minimum of two wires between thermostat and HVAC unit
  • Installation may require professional assistance

Buying Guide

When it comes to choosing the best 2-wire smart thermostat, there are several factors to consider. Here are some features to look for when making your decision:

Compatibility

First and foremost, it is important to ensure that the smart thermostat is compatible with your existing HVAC system.

Some thermostats may only work with certain heating and cooling systems, so it is essential to check the compatibility before purchasing.

Ease of Use

A good smart thermostat should be easy to use and navigate. Look for a product that has a user-friendly interface and clear instructions.

Some models even come with mobile apps that allow you to control your thermostat from your smartphone or tablet.

Energy Efficiency

One of the main benefits of a smart thermostat is its ability to save energy and reduce your utility bills. Look for a product with energy-saving features such as programmable settings, automatic temperature adjustments, and learning capabilities.

Additional Features

Some smart thermostats come with additional features such as voice control, geofencing, and remote sensors. Consider which features are important to you and whether they are worth the extra cost.

Price

Finally, it is important to consider the price of the smart thermostat. While some models may be more expensive than others, it is important to weigh the cost against the potential energy savings and convenience of the product.

Frequently Asked Questions

Are there any 2 wire smart thermostats available?

Yes, there are several 2 wire smart thermostats available in the market. However, it’s important to note that not all 2 wire smart thermostats are compatible with all HVAC systems. Make sure to check the compatibility before purchasing a 2 wire smart thermostat.

Can I install a smart thermostat with only 2 wires?

Yes, you can install a smart thermostat with only 2 wires. However, it’s important to note that not all smart thermostats are compatible with 2 wires. Make sure to check the compatibility before purchasing a smart thermostat.

Which Honeywell thermostat models are compatible with 2 wires?

The Honeywell Home T9 WIFI Smart Thermostat and the Honeywell Home T5+ Smart Thermostat are compatible with 2 wires.

However, it’s important to note that not all Honeywell thermostat models are compatible with 2 wires.

Is it possible to get a smart thermostat without a C wire?

Yes, getting a smart thermostat without a C wire is possible. However, most smart thermostats require a C wire for proper functioning.

If your HVAC system doesn’t have a C wire, you can use a power extender kit to power your smart thermostat.

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