10 Best Smart Thermostat Devices for Your Home in 2021

Listen to the Goldilocks in you — enjoy a room temperature that’s never too hot, never too cold, but always just right!

There are at least two reasons why you should consider purchasing the best smart thermostat. These smart devices help maintain your home’s optimal temperature all year round and will keep your monthly bills from going through the roof.

With that in mind, how will you select the best one that suits your needs? Well, we’ve tried, tested, and analyzed some of the finest thermostats out there, and this is how we determine which one is the best to buy:

Design — thermostats are visible, and the one you buy should reflect your style and your home’s interior design.
Features — the best thermostat for you means having optimal features for your home and your preferences.
Installation & Use — a thermostat should be easily used and installed without the need for tearing down the walls in your home.
Price — you wouldn’t want to break the bank just for the comfort of having an auto-regulated room temperature now, would you?

Having said that, let’s now turn our attention toward the top 10 thermostats and what they have to offer:

Our Top 3 Recommendations

FROM $135.59
FROM $139.06
FROM $119

10 Best Smart Thermostats for 2021

Ecobee Smart Thermostat Review

  • Elegant design

  • Built-in Alexa support

  • Occupancy sensor

  • Learning thermostat

  • Steep price

  • You only get one SmartSensor


Ecobee’s new voice-controlled smart thermostat has a beautiful design that combines functionality and elegance. The color touchscreen is protected by a layer of glass that’s barely noticeable, while the thermostat itself features two digital microphones with echo cancellation and a speaker at the bottom.

The LED lights at the top show you whether voice control is active or not, while the 12 terminals at the back allow you to connect the device to a dozen HVAC appliances in your home. The thermostat also comes with the equally elegant SmartSensor, which you can place in a room that’s beyond the thermostat’s range.


Because this is a remote sensor thermostat, the more sensors you have in your home, the more accurate it becomes. That way, you can even out temperatures across different rooms and avoid having cold or hot spots. The occupancy sensor preserves energy when you’re away from home and gets everything up and running as soon as you come back.

One interesting feature we would like to single out is the “follow me” mode, which keeps track of which rooms are in use and only adjusts the temperature in those rooms. This Ecobee model is one of those intelligent, learning thermostats that adapt to your habits over time and offer smarter temperature control based on how you live.

Installation & Use

When you buy an Ecobee thermostat, you also get a detailed instruction manual to guide you through the setup process. However, before you make a purchase, you should head to the company’s website and check the device’s compatibility with your HVAC. Everything is explained in great detail with diagrams and pictures so you won’t get lost — one of the hallmarks of the best thermostat for your home.

Although you can use the dedicated app to control the temperature or do things manually through the interface, voice control makes everything a whole lot easier. The thermostat has built-in voice support powered by Amazon Alexa, but it also works with Google Assistant and Apple HomeKit.


This Ecobee thermostat costs $249. It comes with one SmartSensor and all the necessary installation equipment you need. Considering the price of this WiFi enabled thermostat, it’s no wonder that the company also offers a three-year warranty and a 30-day money-back guarantee.

Nest Learning Thermostat Review

  • Simple installation

  • Focuses on saving energy

  • Automatic programming

  • Sunblock feature

  • Steep price

  • You have to pay extra for Nest sensors


This third-generation learning thermostat from Nest has a bigger screen than the previous versions, so the display appears cleaner and even more straightforward. This thermostat is controlled by an outer ring that can be pressed and turned to select features or adjust the temperature.

Like many Nest products, energy saving is an important selling point for this Nest thermostat, and eco-friendly features are subtly integrated into the display. Each time your temperature control saves energy, you’ll see a leaf icon appear. Of course, this energy-saving technology adapts to your personal preferences over time.


Nest focuses on having their devices adapt to the needs of their users. After about a week of use, the device will create a well-functioning energy-saving schedule that fits your lifestyle. It’s also worth noting in this Nest thermostat review that the motion-detection feature knows when you’re away from home, maximizing energy efficiency and saving you up to 12% on heating and up to 15% on cooling bills. All of this is done automatically, so you don’t have to program anything yourself.

Moreover, its geofencing feature allows for more accurate motion detection and, hence, an improved away mode. What makes this the best Nest thermostat is that it has a sunblock feature that prevents it from being directly affected by sunlight. There’s also the time-to-temp feature, which tells you exactly how much time it will take for the system to achieve your desired temperature.

Installation & Use

The installation process takes only about half an hour. Nest’s website also offers a detailed guide and a compatibility test beforehand. There is also a video tutorial that provides step-by-step instructions to DIY users.

It may be the best smart thermostat for Alexa, but it’s also compatible with Google Home. This way, you can easily control the device with your voice. However, you would also need the specialized Nest app. As you’d expect, the app lets you adjust the temperature remotely, but it also gives you a detailed report on your energy usage on a daily and monthly basis.


The single pack for this wireless thermostat costs $249. While the kit gives you all the necessary installation equipment, you’ll need to spend some extra cash to get a stand-alone sensor. That said, with this purchase, you’ll be eligible to receive discounts for other complementary Nest products, which is a good thing if you’re working towards creating a smart home.

Honeywell T9 Thermostat Review

  • Best smart thermostat for multiple zones

  • Simple installation for existing users

  • Alexa, Cortana, and Google Assistant support

  • PayPal credit payment

  • No HomeKit support

  • You need to pay extra for sensors


From a design point of view, this Honeywell thermostat doesn’t offer anything fancy or futuristic. Its design looks relatively simple and suits the aesthetics of an average American home. However, one of its main selling points is that it can monitor several rooms at once and create different temperatures based on your priorities. All temperature values in the home are displayed simply in this Honeywell smart thermostat, so adjusting them can be done with ease.


Honeywell’s thermostat relies a lot on the use of its far-reaching smart sensors. You should place these all around the house to create different temperature zones. If you opt for automatic regulation, the thermostat will use its motion-detection technology (together with geofencing) to create the ideal climate in the occupied rooms. Honeywell thermostats also use patented Smart Response technology, making sure rooms always reach their target temperature on time.

Installation & Use

Because the T9 thermostat uses the same wall mount as the other T-series models, existing customers will save a lot of time during the installation process. All they need to do is replace the actual device on the wall. As for other users, this Honeywell digital thermostat manual offers a comprehensive and easy-to-follow guide to help you install the device without any difficulty.

T9 supports many voice assistants, including Alexa, Cortana, and Google. Any device that displays a “Works with Honeywell” logo can support this thermostat. However, it’s worth noting that this particular model isn’t compatible with Apple HomeKit. The Honeywell home thermostat app works smoothly and provides you with special alerts when temperatures are too high or low in your home.


The T9 thermostat alone costs $179.99, but that’s without the smart sensors, which cost $39.99 apiece. You’ll get a small discount if you go with pre-made bundles or choose special offers from retailers like Amazon. You also have the option to pay for the device using PayPal credit with no interest over six months.

Lux Kono Smart Thermostat Review

  • Affordable price

  • Customizable faceplates

  • Geofencing for occupancy detection

  • C-wire alternative included

  • No IFTTT support

  • No additional room sensors


When it comes to this model’s design, it’s fair to say that Lux has taken an unusual approach. It is divided into four panels, with the display on the top left and the knob on the bottom right. The whole faceplate can easily be replaced and customized, so you can play with the colors as much as you like. You control the temperature by turning the aluminum knob, which also grants you access to the menu.


One of the main reasons people look for the best smart thermostat in the first place is to save energy. According to Lux, households that use this device save an average of $174 a year. How does Kono do it? Will, it comes down to switching between home and away modes using geofencing technology. Whenever you leave the house, the thermostat switches to away mode for maximum efficiency.

An exciting feature that makes this one of the best digital thermostat devices is the IAQ mode. When turned on, this mode lets fresh air circulate, even when you’re not cooling or heating your home. That way, you don’t have to change your house’s temperature to enjoy some fresh, pure air.

Installation & Use

The thermostat wiring process for this device is relatively simple. Lux’s Kono model provides you with a comprehensive installation manual. Even if you don’t have the C-wire that is usually needed for thermostat installation, Lux offers its replacement called the Lux Power Bridge.

The best WiFi thermostats, including this thermostat, are compatible with all the major voice-controlled systems, including Amazon Alexa and Google Assistant. It also works with Apple HomeKit, meaning you can connect it to other smart home gadgets and appliances. Interestingly, though, there doesn’t seem to be any support for IFTTT.


Each of these thermostats costs about $139.06, although that’s just the manufacturer’s suggested retail price. You can find the device on Amazon for as little as $100, making it one of the cheapest smart thermostat devices on this list. However, you won’t get any additional sensors with this purchase.

Bosch Connected Control BCC100 Thermostat Review

  • Large and clear display

  • Five different temperature changes a day

  • App gives you control of multiple thermostats

  • Works with Amazon Alexa

  • No IFTTT support

  • No geofencing abilities


With the BCC100 Bosch thermostat, it seems like the designers weren’t going for an ultra-modern, futuristic look. Instead, they focused on creating a substantial user experience with a large, simple interface. In essence, the BCC100 just looks like a tablet installed on a wall, and, in many ways, that’s what it is. You can set up the temperature, choose the working mode, or create a schedule using the highly responsive touchscreen.


Like many programmable thermostats, it functions mainly through user-defined schedules, so you might need to invest some time to create a comfortable environment for yourself. The device allows you to create a heating and cooling schedule on a daily and weekly basis, with up to five different temperature changes a day. You can create home and vacation profiles to get the most out of your thermostat throughout the year. However, this device doesn’t seem to support the thermostat geofencing feature.

Installation & Use

Upon conducting a WiFi thermostat comparison, we’ve found that the BCC100 is reasonably easy to install. Still, it can be problematic if you don’t already have a C-wire, as this is not included in the package. Unlike the Lux Kono, this thermostat offers no alternatives that might help you solve this potential issue. If you don’t have a C-wire, you’ll simply have to hire a professional to install the device for you.

Besides the touchscreen, you can also use the Bosch Connected Control app to set up temperatures and manage up to four different schedules per thermostat. Basically, you can control multiple thermostats with just a single app. This device is another best thermostat for Alexa, although it does not support IFTTT.


The Bosch BCC100 thermostat costs around $135.59, but you can occasionally find better deals on eCommerce sites. Although this is not a bad price, it might be too much for a product that relies a lot on user-created schedules.

Emerson Sensi Smart Thermostat Review

  • Built-in humidifier

  • Early start feature

  • Alexa, Google Assistant, and Siri support

  • Somewhat expensive considering the lack of features

  • Geofencing in beta mode


Let’s be honest; it’s highly unlikely you’ll be impressed with the design of the Emerson Sensi Touch thermostat when you first see it. The device looks fairly simple and outdated because of the thick black area around the display, making it look smaller than it actually is.

When it comes to the actual interface, as far as these smart thermostat reviews go, Sensi has everything you need. The display shows the temperature and humidity and allows you to set the values you want. The menu option lets you put the device into sleep mode, change the back glow, and even customize what you see on the home screen.


Unfortunately, the geofencing option on this device is only in its beta mode, which means it could be buggy and incomplete. Geofencing tracks your location through your phone and lets your thermostat know when you’re not home. That way, it can automatically turn off HVAC appliances to save energy and money. That said, even this beta geofencing option is a step in the right direction for this smart home thermostat.

The thermostat also offers a so-called “early start” feature, which calculates the time needed to achieve the desired temperature, so there’s no guesswork on your part. It also has a built-in humidity sensor.

Installation & Use

The installation itself won’t take more than 15 minutes. The instruction manual will guide you through the process, but, as always, you can also call a professional to install it for you. Like most smart thermostats on the market, this one requires a C-wire, so it could be a slightly more expensive venture if you don’t have it.

While we wouldn’t call this the best programmable thermostat, we like that you can use the app to control all the settings and monitor your home temperatures from afar. The app is also relatively simple and user-friendly. The Emerson Sensi is compatible with all three major voice assistants on the market: Amazon Alexa, Google Assistant, and Siri.


This device costs $149, which isn’t at the higher end of the market, but it’s not exactly cheap, either. For this price, you get a three-year warranty and a 30-day satisfaction guarantee.

Johnson Controls GLAS Thermostat Review

  • Cool OLED translucent screen

  • Indoor and outdoor sensors

  • Smart scheduling feature

  • Alexa and Google Assistant support

  • C-wire adapter included

  • No geofencing feature

  • Expensive


Of all the smart thermostats reviewed in this article, the Johnson Controls GLAS model probably has the most interesting design. This is mainly thanks to its OLED see-through screen, which gives off a uniquely futuristic vibe. The thermostat can be controlled via the touchscreen or the dedicated app.

The display shows your energy savings and air quality and lets you create a schedule according to your needs. The screen is highly responsive, intuitive, and easy to maneuver, which is always worth mentioning in our WiFi thermostat reviews.


The way this device monitors air quality is pretty impressive. Indoors, it monitors the humidity, the amount of volatile organic compounds in the air, and CO2 levels. It also measures the air quality outside so that you know what to expect when you leave the house. It can also warn you about pollen in the air, making it the best learning thermostat for people with allergies.

This model has a smart-scheduling feature, which allows it to learn your habits and modify the HVAC system for maximum energy savings. Besides that, GLAS uses an occupancy sensor to save energy when you’re away from home.

Installation & Use

Most modern smart thermostats are extremely simple to install, and the same can be said for GLAS. There is one slight problem, though. Because it has a see-through screen, you’ll need to patch up any holes from your previous thermostat. This is a bit of a hassle, but it’s worth it if you want one of the coolest thermostats in the market. However, unlike the thermostat reviews previously stated, if you don’t already have a C-wire, this one comes with an adapter.

The app lets you remotely control your home’s temperatures and check a range of reports, including air quality and energy savings. Since it supports Alexa and Google Assistant, you can set this thermostat up to be voice-controlled.


As you’d expect, this product is quite pricey. However, for the extra money, you get what is probably the best thermostat design. So, what prices are we talking about? The thermostat costs $649.98 and comes with the manual, C-wire adapter, all the necessary screws and anchors, and a paintable backplate.

Mysa Smart Thermostat Review

  • Elegant minimalistic design

  • Ability to set up different zones in your home

  • Works with high-voltage systems

  • Works with all of the major voice assistants

  • The screen shows only the temperature

  • Somewhat complex installation


One of the first things you’ll notice about this Mysa model is that it has a minimalistic design that consists solely of a white surface and dot-matrix display. All you can see on the screen is the current temperature, which you can adjust with the up and down arrows. While the minimalistic look is undoubtedly elegant and interesting, it doesn’t provide a lot of information.


Mysa lets you create your own schedule through the app, but if you don’t feel like wasting your time, you can just opt for the quick schedule option, where the thermostat smart device organizes your heating and cooling based on energy-saving statistics.

We’d also like to include in this digital thermostat review that Mysa’s vacation mode can be used to save energy when you’re away from home for an extended period. The thermostat also uses geofencing technology to keep track of your home occupancy automatically and adjust energy-saving plans.

The zoning option is perfect if you want to separate different parts of your home with a couple of thermostats. It’s not exactly cheap, and most users don’t really need it, but it’s still good to know that this feature exists.

Installation & Use

Probably the main reason users opt for a Mysa thermostat is that it works with high-voltage systems, unlike most other thermostats on the market. Having a high voltage thermostat means you have to deal with a slightly more complicated installation process, but the company provides you with a detailed manual to guide you through it.

When it comes to the app, it follows the device’s minimalistic design. You can control the temperature remotely or organize various zones around the house if you have numerous devices. It may not be the best Alexa thermostat, but it’s definitely compatible with it, along with Google Assistant, Apple HomeKit, Samsung SmartThings, and IFTTT.


Compared to the competition, this thermostat is relatively affordable at $139 per unit. You can get an even better discount if you bundle your purchase with more than three devices. For example, if you buy five of these WiFi enabled thermostats, you’ll get a $100 discount.

If you take into consideration that, according to Mysa, the device helps you save up to 26% on your energy bill, this might not be a bad deal.

Sensibo Sky Smart Thermostat Review

  • Shared controls

  • Climate react mode

  • Amazon Alexa and Google Assistant support

  • IFTTT compatible

  • No display

  • Uses a USB cable


Upon smart thermostat comparison, we’ve found that the Sensibo Sky doesn’t have a display like most other thermostats on the market. There are no physical controls on the device; you have to use the mobile app to control it. Another design feature that makes it stand out is that it uses a power adapter as its main energy source. As such, the USB cable sticking out from this wireless home thermostat affects its aesthetics.


The control-sharing feature lets all members of your household take control of your HVAC system. You can even match devices to specific appliances to allow everyone to create their own micro-climate. The Sensibo Sky uses geofencing technology to figure out when you’re away from home and automatically turn off HVAC to preserve energy.

This internet thermostat also possesses a so-called “climate react” mode, where the device reacts to specific triggers you set beforehand. You can set the temperature or humidity levels as the trigger or create your own custom comfort parameters.

Installation & Use

Although you will have to do a bit of manual syncing, this thermostat is reasonably easy to set up and connect to devices in your home. You could even go so far as to say that its fairly straightforward installation process makes it the best smart thermostat for apartment renters.

Simply connect the device to your WiFi network and a power source. Getting the power through the USB cable doesn’t look elegant, but it certainly makes things a bit easier.

Interestingly, besides the phone app, you can also control the thermostat through Sensibo’s website. This probably isn’t a more convenient choice, but it’s nice to have the option, especially if you can’t find your phone. The Sensibo Sky is an Alexa compatible thermostat that also works with Google Assistant, meaning all functions can be voice-controlled. Of course, the thermostat is also compatible with IFTTT.


The regular price for one of these thermostats is $119, although you can take advantage of some seasonal discounts and special offers if you bundle several devices together. The box comes with a single USB cable and various power adapters to suit your specific needs.

iDevices Thermostat Review

  • Affordable price

  • Supports Alexa, Google Assistant, and Siri

  • Customization option in the app

  • Lack of top features

  • C-wire adapter costs extra

  • Overly simple design


While its design isn’t comparable to those you’d find among the best thermostats in previous years, it is an elegant and simple choice that fits into the aesthetics of most contemporary US homes. The actual display is rather small and shows you just the temperature, while the buttons on each side let you navigate through the options. There are no touchscreen capabilities, but they really aren’t necessary. Since it offers support for three of the most popular virtual assistants, you can simply use voice controls or the app.


This thermostat isn’t exactly overflowing with features. It’s a modest option, and that’s reflected in its price.

However, the pre-heat and pre-cool features allow your home to gradually reach the desired temperature to fit your schedule. This WiFi thermostat also lets you use what the company calls the “deadband” feature.

It helps the device preserve energy in its automatic mode by defining a temperature range where you feel comfortable. If the temperature is within limits, the thermostat doesn’t have to juggle between heating and cooling to reach a specific value every time.

Installation & Use

The device’s standard size and its conventional shape mean that you will have no problem replacing your old programmable thermostat with this one. Of course, like most other thermostats on the market, this one also needs a C-wire, which doesn’t come included with the product. If you don’t have it, you’ll need to pay extra for the adapter. This aside, the installation process is fairly simple.

As we’ve mentioned before, iDevices thermostat supports all major virtual assistants like Amazon Alexa, Google Assistant, and Siri, which is standard for the best smart thermostat devices on the market. That is one of the main reasons why most users don’t care about the thermostat’s lack of touchscreen option — it’s easier to rely on voice-control tech instead. The app lets you personalize your schedule any way you want, and everything runs smoothly and efficiently.


According to the company’s official page, a single device costs $93.48. However, you can certainly get better deals on websites like Amazon, so you might need to do a bit of digging to find a better price for this, the best budget smart thermostat on the market. You can also combine the thermostat with other devices like smart speakers to save on shipping costs or get valuable discounts.

How to Choose the Best Thermostat

Because we know our readers won’t settle for anything less than perfect, we have a particular methodology to help us select the best devices on the market.

Here is how we do it:


Since thermostats are usually placed in the central part of your home, they should match the interior style and tone. Moreover, since you will use it every day, you need something simple, efficient, and intuitive. In this section, we took both appearance and functionality into consideration. If it doesn’t look good or its interface is too chaotic to use easily, it won’t be anywhere near our best smart thermostats list.


Next, we examine the most important features that we consider must-haves. We’re going to tell you what makes each thermostat worthy of your time and money and why it stands out from the crowd. Sometimes, these features are expected and reasonable; other times, they’re bold and innovative.

Installation & Use

Smart thermostats are usually built for users who love the DIY approach but don’t want to tear their walls down to make a complicated piece of electronic gear work. Ideally, the best home thermostat is one that doesn’t require an overly complicated installation process. Top-rated companies will always provide you with a high-quality manual, a compatibility test, and customer support should you encounter any problems.


Last but not least, we have to mention the price of every thermostat we review. Smart thermostats can be expensive, especially when you include the sensors and various other pieces of equipment they need to function correctly.

In our quest to find the best WiFi thermostat, we check to see the latest deals available, give our assessment of the cost, and tell you plain and simple whether it’s worth it or not. We wouldn’t want you to miss out on a good thing simply because the price is deceptively steep or unclear. As we assess these devices, we try to put ourselves in your shoes.

Wrapping Up

When choosing the best gadgets for your home, it’s always worth it to take our time, and smart thermostats are not an exception. The temperature will be more enjoyable, there will be lesser cold and hot spikes, you will save on heating and cooling bills, and you can help the environment by reducing energy consumption. All that while you rest comfortably in your home. What could be better?

Frequently Asked Questions (FAQ)

What is the best thermostat on the market?

Some of the finest smart thermostats currently on the market are the Ecobee smart thermostat, Nest Learning Thermostat, Lux Kono smart thermostat, Johnson Controls GLAS thermostat, and Bosch Connected Control BCC100 thermostat. They all provide good quality and useful features that make our lives easier and reduce our energy bills. But this is a relatively new area, and new companies are emerging every day, so this list could easily change.

Who makes the best smart thermostat?

The companies that can boast about creating some of the finest thermostats are Ecobee, Nest, Honeywell, and Bosh. Some of them are pioneers in automatization processes, like Honeywell; some are leaders in the HVAC and home appliances sector (Bosh). Some of them are founded by IT giants (Nest was launched by Google). No matter which of these brands you choose from, you’re guaranteed to be satisfied with your purchase.

Are smart thermostats worth it?

The US Department of Energy statistics shows that using programmable thermostats can reduce heating and cooling bills by 10% on average. Some smart thermostat manufacturers promise even better results, claiming their gadgets can help you save up to 26% of your energy bill.

Even if you calculate the smallest savings of 10%, it will still be a nice saving, and it will pay for itself in a few months or years, depending on device and installation cost.

How do I choose a smart thermostat?

When choosing a smart thermostat, you should first decide what functionalities you need and the price you are willing to pay. Is intuitive AI important to you? How many sensors do you want to place, and can the thermostat control each room’s temperature individually? But most importantly, you need to make sure that the smart thermostat is compatible with your existing HVAC system.

How much does it cost to install a smart thermostat?

The average cost of installing a smart thermostat is between $250 and $350, depending on where you want it installed and the amount of work needed. You can save money by installing it yourself, but the C-wire connection requires you to have some knowledge and experience as an electrician.

If you already have a thermostat and want to replace it, the good news is that the newer devices can also use the old wall mount, so you can just need to replace it.

Which is better, Ecobee or Nest thermostat?

Both Ecobee and Nest are top-of-the-line products, and it’s hard to say which one is better. Both companies provide their users with good quality and useful features, so it’s just down to personal preferences.

Ecobee is better for people who like to make the adjustments, while Nest is better for the click-and-forget type of people who want the machine to make their life easier. Also, Nest doesn’t support Apple HomeKit, while Ecobee supports all the major voice assistants. Nest doesn’t require a C-wire installation, while the Ecobee does; If you don’t want to hire an electrician, then the Nest should be the best smart thermostat for you.