Best 2 Wire Smart Thermostat – The Ultimate Guide

FACTS CHECKED BY  Jose George​

Are you ready to take your smart home setup to the next level? If so, then you need the best smart thermostat. While it can be quite challenging to navigate all the different types, models, and options, this article will provide you with the five best 2-wire smart thermostats. It will also cover what a 2-wire configuration is and how they work.

Table of Contents

Top Three

Google Nest Thermostat
  • ENERGY STAR-certified smart thermostat for a home that helps you save energy and stay comfortable.
  • Connectivity: 802.11b/g/n 2.4 GHz, 802.11a/n 5 GHz Wi-Fi.
  • Wireless interconnect: Bluetooth Low Energy Please refer to the product description section below for all applicable legal disclaimers.
Honeywell Home 7-Day Programmable Touchscreen Thermostat
  • Scheduling your heating/cooling cycles to fit your lifestyle is easy, with options to program day-to-day, over the weekend, or for an entire week.
  • Includes: Package includes thermostat and receive
  • Thermostat Type: Programmable
Emerson Sensi Wi-Fi Smart Thermostat
  • Sensi won’t sell your personal information to third parties
  • The ENERGY STAR-certified Sensi smart thermostat can help you save energy with flexible scheduling, remote access, and usage reports.

What is a 2-wire thermostat?

As the name suggests, a 2-wire thermostat has just two wires connecting it to the power source. There are different types of thermostat wire configurations, with the 2-wire being the lowest number of wires. Due to their unique and limited capabilities, you may refer to 2-wire thermostats as single-pole or heat-only thermostats.

2-wire thermostat configurations are available for you to use with low-voltage heating systems, such as a gas furnace or heating pump, and with line voltage heating systems (for example, a baseboard heater).

Any thermostat can only operate with one of these heaters, so you can’t use a low-voltage model with high-voltage systems, and vice versa. These two types run at a specific current. Low-voltage models operate at a mere 24 volts, while line-current types run between 120 and 240 volts.

What does the wiring color represent?

2-wire thermostats have two wires coming out of the back of them, so there are only two colors that you will have to remember when working with these models. It makes your job easier than higher wire configurations such as 4-wire or 8-wire.

Red is the color of the first wire, providing a connection between the ‘R Terminal’ of the thermostat and the main source of electrical current. The other color is white, which links the thermostat’s W Terminal’ with the electricity source. When working with any electricity, it is always important to understand and implement procedures to prevent the risks. 

How you set up the two wires can differ quite significantly depending on factors such as the brand, model, design, and configuration of your thermostat and furnace. Consider contacting a qualified electrician or heater technician to ensure you do it right.

Best 2-wire smart thermostat

1. Google Nest Thermostat

1. Google Nest Thermostat

Features & Benefits

  • Firstly, this product is a part of the well-known and highly-trusted Google Nest brand.
  • Secondly, there are many options for customizing the thermostat, including colors and inclusions.
  • Lastly, it boasts an Energy Star Certification, so you can be sure it will be both affordable to operate and good for the environment.

Downsides

  • The settings can be difficult for people unfamiliar with the technology.

Customer Reviews

“Love how you can control it from anywhere with an app. Easy install, looks good, loved the schedule.”

2. Emerson Sensi Wi-Fi Smart Thermostat

2. Emerson Sensi Wi-Fi Smart Thermostat

Features & Benefits

  • Firstly, the manufacturers (Sensi) promise they won’t sell your personal or private information to third parties.
  • Additionally, it is easy for most people to install it at home.
  • Thirdly, the style is very similar to a traditional thermostat, so it’s perfect for homes with less modern designs.

Downsides

  • Customer service can often be quite poor and take a while to respond.

Customer Reviews

“Such an easy setup with the wizard and connected right away. A clean and simple app too.”

3. Honeywell Redlink Prestige Touchscreen Thermostat

Features & Benefits

  • Firstly, you can easily program the thermostat in just a few seconds to turn it on or off at any specific time.
  • Additionally, it uses RedLINK wireless communication to allow you to program and control it remotely.
  • Finally, the wall-mounted controls are touchscreens, adding a modern feel to your home.

Downsides

  • It does not control the temperature as effectively as alternative models.

Customer Reviews

“This, together with my other 4 Honeywell thermostats in my zoned system, has not only balanced the temperature of my home but has cut my energy usage in half.”

4. Best 2 Wire Smart Thermostat: Honeywell Home 7-Day Programmable Touchscreen Thermostat

4. Honeywell Home 7-Day Programmable Touchscreen Thermostat

Features & Benefits

  • Firstly, it offers excellent ease of use, allowing you to program daily, over a weekend, or any other specific period.
  • Secondly, the display is extremely high-quality and backlit for night-time accessibility.
  • Also, you will receive Smart Response Learning Technology so that your thermostat can automatically heat and cool your home.

Downsides

  • The differential cycle (how often it cycles on and off) is way too low, and there is no way for you to adjust this.

Customer Reviews

“This product is easy to install, operate, and overall good.”

5. Best 2 Wire Smart Thermostat: Vine Programmable 5th Generation Smart Home Thermostat

5. Vine Programmable 5th Generation Smart Home Thermostat

Features & Benefits

  • Firstly, the hardware consists of a high-end, next-generation chip to provide the fastest internet connection.
  • Secondly, it is compatible with several devices, including Amazon Alexa and Google Assistant.
  • Thirdly, installing the thermostat is quick and easy, so you don’t have to pay a technician.

Downsides

  •  Connecting the thermostat to other smart home devices can often be challenging.

Customer Reviews

“Love the software, and very easy to incorporate into your LAN. Good features, and the phone app is very good as well.”

Conclusion

2-wire thermostats run at varying voltages, so it’s important to choose the right type for your needs.

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