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The Best WiFi Thermostats of 2019

The Nest took home the top award as the best wifi smart thermostat.
Monday October 7, 2019
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After researching all the top smart thermostats currently available, we purchased the 9 best models to test out head-to-head and see which wifi thermostats are truly worthy of an award. We have been testing and comparing these products for close to four years now, rating and comparing their ease of use, accuracy, and various smart functions. We also scored the difficulty of the installation process for each thermostat and have updated our review whenever any new product came out or a new result emerged from long-term testing. Check out the full review below to see which wifi thermostat claimed the top spot, which is the best bargain buy, and which has the smartest features.


Top 10 Product Ratings

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Awards Editors' Choice Award Best Buy Award  Top Pick Award  
Price $249 List
$249 at Amazon
$169 List$250 List$250 List
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$179 List
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Pros Sleek, easy to install, accurateVery accurate, subdued design, very easy to set upStylish, accurateIntegrated Alexa voice assistant, easy to installEasy to use, good remote access
Cons Expensive, support just refers you to a Nest ProLimited color options, display is harder to readVery expensive, seemed a little buggy to usLackluster performance in our accuracy tests, could be more intuitive to useExpensive, inaccurate, voice control through the app is silly
Bottom Line Best for the smart home, but may be underutilized in many homesThe Nest Thermostat E is a fantastic product for those that want most of the features of a premium product without paying a premium priceThis expensive thermostat looks great but its performance left a bit to be desiredWhile the Ecobee SmartThermostat isn’t our all-time favorite thermostat, it is great for frequent Alexa usersThe largest screen, and the easiest to use by far
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Rating Categories Nest Learning... Nest Thermostat E Johnson Controls... SmartThermostat... Honeywell Wi-Fi...
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Specs Nest Learning... Nest Thermostat E Johnson Controls... SmartThermostat... Honeywell Wi-Fi...
Colors Stainless Steel, Copper, White, Black, Mirror Black, Brass, Polished Steel Frosted White Transparent screen with silver base Black Silver
Battery Backup Built-in, rechargeable lithium-ion battery Built-in, rechargeable lithium-ion battery No No No
Learning/ Adaptive Controls Yes - "Nest Sense" Yes - "Nest Sense" No Yes - adaptive Yes - "Smart Response Technology"
Dimensions Diameter: 3.3 in
Depth: 1.21 in
Diameter: 3.1 in
Depth: 1.14 in
Height: 5 in
Width: 5.5 in
Depth: 1 in
Height: 4.29 in
Width: 4.29 in
Depth: 1.00 in
Height: 3-1/2 in
Width: 4-1/2 in
Depth: 7/8 in
Works Directly with Alexa/Amazon Echo Yes Yes Yes; Also built-in Cortana Built-in Yes
Works with Apple HomeKit No No No Yes No
Model # T3007ES T4000ES SIO2-10000 SmartThermostat with voice control RTH9580WF

Best Overall Thermostat


Nest Learning Thermostat


Nest Learning Thermostat
Editors' Choice Award
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$249.00
at Amazon
See It

73
OVERALL
SCORE
  • Ease of Use 7
  • Install & Support 8
  • Remote Access 6
  • Accuracy 9
Colors: Stainless Steel, Copper, White, Black | Battery Backup: Built-in, rechargeable lithium-ion battery
Exceptionally accurate
Sleek and stylish design
Very easy to install
Pricey

Taking home the Editors' Choice award and the title of Best Thermostat, the Nest Learning Thermostat, 3rd Gen. earned the highest score we have seen from one of these products. This sleek and stylish product is jam-packed with features and functionality, all while being extremely easy to use and highly accurate. It has a phenomenal display and is available in a handful of colors with different trim plates to match the style of any home. In addition to allowing you to control your HVAC system both when you are at home and when you are away, the Nest can interact with many other smart home devices, allowing you to control your heater or turn on your A/C by voice command or from your smartwatch. For those that are looking to save on their energy bills, this model utilizes both an occupancy sensor and geofencing to turn down the heat when you leave and turn it up when you get.

However, this wifi thermostat is definitely on the pricey side, with the chance to skyrocket even higher if your home has multiple thermostats. Additionally, we have also heard some complaints with the learning feature from some users, especially those that keep relatively inconsistent schedules week to week. These are minor drawbacks and shouldn't dissuade you from the Nest too much, as long as you can afford it, as the Nest is your best bet if you want the most top of the line, fully-featured smart wifi thermostat on the market today.

Read review: Nest Learning Thermostat

Best Bang for the Buck


Nest Thermostat E


The Nest Thermostat E.
Best Buy Award
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$169
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69
OVERALL
SCORE
  • Ease of Use 6
  • Install & Support 8
  • Remote Access 6
  • Accuracy 9
Colors: Frosted White | Battery Backup: Built-in, rechargeable lithium-ion battery
Extraordinarily accurate
Stylish but subtle design
Easy to install
Limited color options
The display isn't the easiest to read

Meriting the second-highest score overall, the Nest Thermostat E earned the Best Buy award for offering fantastic performance at a great price. This newest addition to the family of Nest thermostats is only available in frosted white, providing an overall muted appearance when compared to the Nest Learning Thermostat. This allows the E to be much less obtrusive and more casually blend into your existing decor — a great option for those that prefer to camouflage their thermostat, rather than make a style statement with it. This model still maintains Nest's high level of accuracy, is very easy to use and install, all at a price that is much more palatable than their flagship product.

However, this thermostat doesn't quite have the striking looks of the flagship Nest Learning Thermostat and isn't compatible with as many types of HVAC systems, so you should double-check that your system is compatible before purchasing. In fact, you should do this before you buy any of these products.

Read review: Nest Thermostat E

Best on a Tight Budget


Honeywell Wi-Fi 7-Day Programmable


Honeywell Wi-Fi 7-Day Programmable
Best Buy Award
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$79.00
(21% off)
at Amazon
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58
OVERALL
SCORE
  • Ease of Use 5
  • Install & Support 5
  • Remote Access 7
  • Accuracy 9
Colors: White | Battery Backup: No
Very accurate
Inexpensive
Good for remote access
Harder to use
Uninspiring appearance

Searching for a minimalistic smart thermostat that forgoes all the bells and whistles? Shopping on a budget? If either of these are true, then you can't go wrong with the Honeywell 7-Day Programmable. This product is a fantastic value, earning the Best Buy Award, and offers reliable remote access to adjust the temperature or monitor your home while you aren't around. This model is accurate, easy to use, and retails for less than half of what the top products go for, making it a great option for homes with multiple thermostats.

This product, in all honesty, is a standard, run-of-the-mill programmable thermostat with the ability to be remotely adjusted — nothing more, nothing less. The appearance and setup process isn't quite as polished as some of the other models but it gets the job done and is a fantastic value. It is a bit harder to operate and install, so expect to be looking through the manual a bit more than simply following guided tutorials and flashy prompts, but it is by far the best option if you have multiple thermostats and don't want to spend a fortune replacing them.

Read review: Honeywell 7-Day Programmable

Top Pick for Integrated Alexa Capabilities


Ecobee SmartThermostat with Voice Control


The Ecobee Smart Thermostat with Voice Control.
Top Pick Award
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$249.00
at Amazon
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65
OVERALL
SCORE
  • Ease of Use 6
  • Install & Support 8
  • Remote Access 6
  • Accuracy 5
Colors: Black | Battery Backup: No
Very easy to set up and install
Tons of integrated smart capabilities
Not the most stylish model out there
Interface and display is a little less user-friendly than top models

Earning one of the better scores overall, the Ecobee SmartThermostat with Voice Control not only impressed us with its solid performance across the bulk of our tests but also with its superior set of smart functions. This thermostat doubles as a fully-featured Amazon Alexa device and has an upgraded microphone and speaker compared to its previous versions. The SmartThermostat matches the abilities of an Amazon Echo or any other Alexa home speaker, allowing you to use calling, messaging, and Drop-In features right on the thermostat. This thermostat is a breeze to install, solidly easy to use, and a great way to add voice control abilities to your smart home right on the wall.

However, we still aren't huge fans of the scheduling method on this device, finding it to be a bit more restrictive and much less intuitive to use than many of the other models we have reviewed. It also doesn't quite match the aesthetic appeal and user-friendliness of the top models but if you want an all-around good thermostat that is packed with smart features and functions, then this model from Ecobee is a great choice.

Read review: Ecobee SmartThermostat with Voice Control


Some of the top thermostats  ready to go on our testing board.
Some of the top thermostats, ready to go on our testing board.

Why You Should Trust Us?


We bought all of the smart WiFi thermostats in this review from major retailers at the normal price — just like you would — and TechGearLab won't ever accept any evaluation models for free or at a significantly reduced cost for our reviews, to ensure that our review is completely unbiased and we have no financial incentive to pick one product over another.

Our testing and review team of Austin Palmer and David Wise have extensive experience comparing and scoring smart home products, having reviewed hundreds and hundreds of different tech gadgets and home products, including dozens of smart home specific ones. In addition to controlled side-by-side testing, we also installed these products in various homes and offices and have used them for extended periods with all sorts of different HVAC systems, updating the review with any new information or opinions gleaned from long term real-world use.

Related: How We Tested Wifi Thermostats


Analysis and Test Results


We bought the best thermostats currently on the market today and put them through a series of side-by-side tests to determine overall scores from 0-100. We looked at the ease of installation as well as the ease of use, how responsive customer support was, the remote access capabilities, and the temperature accuracy of each model. Our tests were split into four weighted rating metrics, with the results of each thermostat discussed below.

Related: Buying Advice for Wifi Thermostats

Value


Both our Editors' Choice Award winner and our Best Buy Award winner, the Nest Learning Thermostat and the Nest Thermostat E are excellent products, but can still be a bit pricey. This can get especially expensive if your home has multiple heating zones, and thus multiple thermostats. The E offers almost the same functionality as the Nest Learning Thermostat, having a slightly lower-quality, muted display and slightly fewer features, but is a bit friendlier on your budget. If both of these offerings from Nest are still too expensive, you may want to consider the Honeywell 7-Day Programmable. It doesn't have anywhere close to the same functionality as our top models, but if you want a bare-bones programmable thermostat that allows for remote access without breaking the bank, this is the model for you. The Ecobee SmartThermostat isn't an amazingly good deal on its own but it can be a smart budget choice if you take into account the fact that you don't have to buy an additional Alexa device if you want to add voice control to your smart home.

The initial setup process for this thermostat is relatively pain-free.
The initial setup process for this thermostat is relatively pain-free.

Ease of Use


This is one of the most important metrics when it comes to wifi thermostats, comprising 40% of our total scores. None of these models are remotely useful if they prove to be too difficult to operate for the average consumer. In fact, this is one of the reasons cited by Energy Star for the lack of savings found when using a programmable thermostat: 30% (potentially higher) were "unable, unwilling, afraid, uninterested, or otherwise reluctant" to use the scheduling feature, whether it was the default or custom. This will negatively impact the potential energy savings of the device, as a programmable thermostat that is too difficult to program isn't any better than a single-temperature model.


To test the ease of use, we looked at the initial setup, setting the time and date, the ease of setting up a schedule, adjusting the temperature, and the difficulty in utilizing the advanced features. Comparing the thermostats side-by-side, we ranked them on each of the above attributes and determined scores based on their performance.

The Honeywell Smart with Wi-Fi earned an 8 out of 10 for being supremely easy to use, which is the top score of the entire group. This product guides you through the initial setup process with a series of prompts and questions — even going so far as to walk you through the process of setting up a heating and cooling schedule, which is a unique feature to this product.

The home screen of the Honeywell Smart thermostat.
The home screen of the Honeywell Smart thermostat.

The menu layout is particularly intuitive and easy to navigate and this thermostat from Honeywell is jam-packed with convenience features, even letting you disable the touchscreen for 30 seconds to clean the display. It has a great display that conveys all the necessary information and gives you full control over the backlight brightness.

The Nest Learning Thermostat followed, earning a 7 out of 10. This thermostat also guides you through the entire setup process with questions and prompts like the Honeywell Smart but we found it to be much more of a hassle to set a schedule on the Nest, mainly due to its single-button and wheel interface. This can also make it a bit annoying to enter your network password.

The Nest interface is limited to a single button (the entire thermostat) and rotating the outer wheel.
The Nest interface is limited to a single button (the entire thermostat) and rotating the outer wheel.

However, it still is fairly intuitive to scroll through the menus for additional options and exceptionally easy to adjust the temperature by rotating the dial. This will also override the schedule and hold the temperature you set manually until the next change in the schedule. The display on this product is particularly vibrant and displays information very clearly, even from a distance away.

Next, the Nest Thermostat E, the Ecobee SmartThermostat, and the Johnson Controls Glas all earned a 6 out of 10 for their ease of use. The setup process on the Ecobee SmartThermostat is just as easy as the Honeywell Smart and the Nest Thermostat, again utilizing a series of guided prompts to walk you through the various tasks.

The SmartThermostat is very easy and intuitive to use.
The SmartThermostat is very easy and intuitive to use.

It also is very easy to scroll through the different menus and set things like the time and date but we aren't huge fans of the scheduling system on the SmartThermostat. You set different comfort zones for each block of time and then separately set the temperature for each comfort zone, which just doesn't seem as user-friendly and is more restrictive than setting a temperature for each chunk of time directly. We didn't think the display on this model conveyed information quite as clearly as the top models and the touchscreen slider that adjusts the current temperature isn't our favorite interface, keeping this thermostat out of the top tier when it comes to ease of use.

The Nest Thermostat E essentially matched the performance of the Nest Learning Thermostat — only falling a little short when it came to the display. The initial setup and scheduling are identical to the original Nest, with a helpful series of prompts to guide you through the process. It's also very easy to adjust any of the advanced settings and you can hold the temperature until the next slot in the schedule. However, the frosted display pales in comparison to the high-definition display of the Learning Thermostat and is much harder to see when viewing it from an angle.


The GLAS by Johnson Controls also makes it exceptionally easy to complete the first-time setup process, with simple and easy to follow prompts that lead you through the entire process.

The setup process  once it is mounted  is made quite easy with a series of prompts.
The setup process, once it is mounted, is made quite easy with a series of prompts.

This thermostat will also automatically set the date and time when connected to WiFi, though you do need to set the time zone manually. There aren't a ton of other settings to adjust, but they are fairly intuitive to find and alter, without a ton of submenus hiding them.

It's fairly easy to adjust the temperature setpoint by selecting it and then using the up or down arrows on the touchscreen to change it. The information of display is very clean and easy to read — even from a fair distance — and you have the option to adjust the brightness of the screen.


However, this can be a bit dependent on what type of walls you have, do to the transparent nature of the GLAS. We also noticed that the screen almost instantly picks up fingerprints and require semi-regular cleanings. We also weren't huge fans of the scheduling, as you don't have the option to set a specific temperature for different times, only set "Home" and "Away" temperatures and set what times you are expecting to be present for.

The scheduling isn't the most intuitive.
The scheduling isn't the most intuitive.

This thermostat did stand out by having built-in air quality measuring capabilities, as well as being directly compatible with Alexa voice control and having Cortana voice control built-in as well.

The Sensi Touch Wi-Fi, the Honeywell 7-Day Programmable, and the Ecobee3 are all about average to use, earning this group a 5 out of 10 in this set of tests.

The Sensi Touch Wi-Fi is a little more difficult to schedule than some of the other models in the pack, only offering a limited set of scheduling abilities on the device itself, as well as possessing the odd quirk of needing the WiFi turned off. This model at least informs you that this is necessary, compared to being forced to figure that out on your own with the original Sensi. The same goes for setting the time and date.

This thermostat has a decent suite of advanced features and functions that can be adjusted, such as enabling "Safe Mode", where the thermostat will ignore rapid commands — a great option for families with children that are prone to playing with the thermostat.

This model makes it easy enough to adjust the current temperature, using the touch screen instead of buttons. The current temperature is displayed prominently, with the set temperature shown in smaller text off to the side. We did wish that the screen brightness could be adjusted.

The touchscreen interface makes this Sensi easier to use than its predecessor.
The touchscreen interface makes this Sensi easier to use than its predecessor.

The Honeywell 7-Day Programmable uses an interface similar to traditional thermostats to program a schedule and did require us to dive into the manual to figure out what we needed to do to set up the WiFi. It is also very easy to adjust or hold the current temperature using the arrow keys but it can be a bit difficult to access the menus for advanced settings. It takes a combination of button presses — think video game cheat code — to get to these menus, which is a handy way of preventing unauthorized access but we did find that we had to consult the manual every time we needed to adjust something to look up the appropriate code.

The Ecobee holding the set temperature.
The Ecobee holding the set temperature.

The Ecobee3 Lite also relies on a series of guided prompts to complete the initial setup process, but we didn't find them to be as intuitive or informative as the prompts for some of the other products we tested. The rest of the settings are pretty straightforward to adjust, but we did find that adjusting the current temperature and setting a schedule to be far less user-friendly than the top models. The display also makes it a little harder to see and understand the information that is displayed.

The Ecobee3 and Honeywell Smart both offer the most options, allowing you to hold the temperature indefinitely, for a set amount of time, or until the next change in the schedule, while the Honeywell 7-Day limits you to either holding it indefinitely or until the next schedule change, while the Nest thermostats will only hold until the next slot in the schedule.

There were a few other useful features that were scattered around to make them easier to use. For example, the Honeywell Smart will let you deactivate the screen for 30 seconds to clean it, and the Honeywell Smart,Ecobee3, and the Nest products allow you to input maintenance reminders for things like changing the air filters.

We found it substantially more confusing to set up the Sensi Wi-Fi Programmable — both with the initial set-up and creating a schedule. It was bad enough that we originally assumed that it was not possible to set up without the app, eventually determining that it is only possible to set the schedule without the app when the device is not connected to WiFi. These struggles were primarily on the device itself, where the setup was quite easy if done exclusively on the mobile app. This confusion and discrepancy earned the Sensi Wi-Fi Programmable the lowest score of the entire group in this metric, a 4 out of 10 on our tests.

Install & Support


While Ease of Use is our highest weighted metric, Install & Support was close behind, making up 30% of the total score for each wifi thermostat. While all of these products are designed with a DIY installer in mind, the installation process can get a bit more complicated if you have an older home or a particularly uncommon HVAC system. If that's the case, then you may need to have a professional installation completed. In addition to the install, we tested the customer support of each company, putting in a request and evaluating the responses, as well as rating the supplied documentation.


To rate the quality of the customer support, we sent the following email anonymously to each manufacturer, then awarded points based on the timeliness and quality of the response we received:

"Hi there. I am trying to install my new [thermostat model]. I just moved into a new home and the previous owners took out their thermostat and left these wires hanging out (blue, yellow, red, green). I have no clue as to which wire goes where. I only have a heating system, that seems to be electric. It gets very cold at night and I would love to be toasty warm. Thanks in advance for the help!"

With this picture attached:

The photo we sent into each customer support service. We asked them to assist us in determining where to go from here if we did not know which wire controlled what.
The photo we sent into each customer support service. We asked them to assist us in determining where to go from here if we did not know which wire controlled what.

To compare the ease of installation, we hooked each thermostat up to both our custom testing board and installed them in our office. We created a custom, testing setup, mimicking a single-stage heating, single-stage cooling, and auxiliary fan HVAC system, allowing us to easily compare the different products side-by-side. Our building has a single-stage heating and auxiliary fan system, which is a fairly typical configuration.

The reverse side of our thermostat testing board.
The reverse side of our thermostat testing board.

The Nest Learning Thermostat, the Nest Thermostat E, the Ecobee SmartThermostat, and the Ecobee3 Lite all tied for the top spot in this rating category, each earning an 8 out of 10.

The Nest customer support wasn't exceptionally helpful for a DIY install, repeatedly referring us to a Nest Professional instead of walking us through the steps to solve our issue. However, both Nest thermostats did an exceedingly good job of providing adequate, step-by-step documentation, as well as helpful videos online. We also particularly liked that there is a built-in level and an included screwdriver to make the installation process even easier.

The Ecobee support team was the exact opposite, walking us through the process of identifying which wire went where over a series of emails. The SmartThermostat and the Lite also has extensive documentation — both in the companion app and in written guides — that walk you through the physical install. There are plenty of instructional videos if you get lost and both have an integrated level in the trim plate, so you can easily make sure you aren't hanging it crooked.

The built-in level on the Ecobee4's backing plate made it easy to install.
The built-in level on the Ecobee4's backing plate made it easy to install.

Following these top two thermostats, the Glas and the pair of thermostats from Sensi all earned a 7 out of 10. We found the customer support from the GLAS to be very helpful in resolving our issues, particularly with the GLAS-specific smart functions. The team from Sensi wasn't quite as helpful, usually requiring a follow-up email to get our issue fully resolved.

However, we did find the Sensi and the Sensi Touch Wi-Fi were the easiest models to install. These models came with a built-in level on the base plate, something that we found amazingly helpful. There is also extensive documentation if you get stuck.

The GLAS is a little bit more difficult to install, lacking a built-in level and has a much smaller base to cover up imperfections on your wall, which may mean some drywall repair or touch-up painting is in order if you had an existing thermostat already installed or you can use the included white trim plate if you prefer that look.

The white trim plate can be used to hide imperfections on your wall.
The white trim plate can be used to hide imperfections on your wall.

Finishing out the group, both the Honeywell models merited a 5 out of 10. Customer service was fine, though not overly helpful, and the installation process took a bit longer than the others.

Installation of these products essentially breaks down into checking if your system is compatible, through the online documentation, or contacting the customer service department of the manufacturers and then completing the actual install. For the majority of people — those with a commonplace HVAC system --, this should be a relatively painless process. For those with a unique system, special attention must be paid and at the very least, consulting with the manufacturers before making a purchase.

Remote Access


Remote access, while being one of the cornerstones of wifi thermostats, ended up only meriting 20% of our total score. This rating metric was split into three major components: adjusting the temperature through the smartphone app, setting and editing the schedule remotely, and the ease of adjusting other, more advanced settings through the remote interface. While originally thinking this would be a much more substantial part of the scores, we found that most of the thermostats performed exceptionally well in this category.


The Honeywell Smart, the Honeywell 7-Day Programmable, the Sensi Touch, and the Sensi Programmable all received a 7 out of 10 for their top-notch remote access capabilities. Both of the models made by Honeywell use the same application, and thus, performed identically in this metric. Based on input from various users and user reviews, we determined that adjusting the schedule remotely was the most important to most people, and made up close to half of the score for this category.

Setting the schedule on the Sensi app.
Setting the schedule on the Honeywell app.

Both of the Honeywell models performed extraordinarily well, with it being substantially more user-friendly to set up the schedule, with the 7-Day Programmable model slightly easier to configure than the Smart with WiFi model. The pair of Sensi thermostats also offered an easy setup, and an incredible amount of customization — allowing you to set the temperature in as little as 15-minute increments! There is also a calendar view where you can see the entire week and all the temperatures you set.

The Nest Learning Thermostat, the Nest Thermostat E, the Ecobee SmartThermostat, the Ecobee3 Lite, and the Johnson Controls GLAS all earned a 6 out of 10 for their solid remote interfaces.

The Nest app did offer an attractive amount of customization, like the Sensi, but the interface still felt substantially less intuitive.

However, when it came to adjusting the current temperature, the Nest's were by far the clear winner, allowing you to either drag and drop the desired temperature, or adjust it through a set of up/down arrows.

Setting the Nest to heat on the mobile app.
The mobile app showing the Nest in cooling mode.

The Ecobee apps essentially mirror the display on the actual thermostat, which means that it is substantially less user-friendly to set a schedule or adjust the temperature than many of the other products. However, we did find that we usually preferred to use the app to set the schedule or change the temperature because the adjustment slider has a larger range per screen on your phone than the thermostat.

The layout of the app is very intuitive but the scheduling features left a bit to be desired.
The layout of the app is very intuitive but the scheduling features left a bit to be desired.

Unfortunately, you are locked out of adjusting any of the advanced settings remotely.

The GLAS app also mirrors the device in terms of layout, but you get the added benefit of not smudging or leaving fingerprints on the display of the GLAS. This thermostat shows smudges or fingerprints much more than the others and we found ourselves almost perpetually cleaning it, so using the app was a welcome reprieve from wiping it down. The scheduling system doesn't change on the remote app — even though we wished it did — as setting the temperature for home or away and then setting times seems much more difficult than just designating a temperature for each chunk of time.

We compared each thermostat to a lab-grade thermometer to test the accuracy of each model.
We compared each thermostat to a lab-grade thermometer to test the accuracy of each model.

Accuracy


We immediately noticed discrepancies in the measured ambient temperatures when setting up multiple models side-by-side, with some even showing a discrepancy of up to two degrees. While these differences may be tiny, and a difference of a degree or two may seem like some trivial griping, accuracy is an incredibly important aspect of this product. The most energy-conscious among us will have the temperature setting based on the Government EnergySaver guidelines , to maximize energy savings. An inaccurate thermostat can be a severe detriment to saving you money, and leave you guessing if your home and away temperatures are set anywhere close to where they should be. Overall, our accuracy tests account for 10% of each product's score.


To test this, we compared each thermostat against a lab-grade thermometer multiple times after allowing the temperature to settle and compared the differences. All of our measurements were taken in Fahrenheit.

The Honeywell 7-day was only off by 0.23 degrees F in one of our tests.
The Nest compared to our lab thermometer  showing a difference of only 0.23 degrees F.

Three of the models that we tested, the Nest Learning Thermostat, Nest Thermostat E, and the Honeywell 7-Day did exceptionally well, each earning a fantastic score of 9 out of 10 in our tests. The Nest models were typically within 0.5 degrees of our control thermometer, with the Nest rounding its measurement to the nearest whole degree. The Honeywell 7-day matched the performance of the Nest's throughout our accuracy testing, maintaining approximately the same margin of error.

The GLAS was right behind, earning an 8 out of 10. It was close to the top products, but usually showed a slightly larger discrepancy than the Honeywell 7-Day and the Nest models — closer to a full degree off.

Both Sensi models followed, usually differing from our control by just about a degree or a little more, earning them a 7 out of 10.

The Ecobee SmartThermostat and the Ecobee3 were anywhere from a half a degree to two degrees off, but these thermostats do give you an option to calibrate the temperature if it is consistently off by the same amount. This earned them a 5 out of 10.

The Ecobee4 was usually within a degree of the control thermometer.
The Ecobee4 was usually within a degree of the control thermometer.

By far, the worst performer in our accuracy tests was the Honeywell Smart, earning a dismal 2 out of 10 in our tests.

There was close to a two degree discrepancy between the Honeywell Smart and our control thermometer.
There was close to a two degree discrepancy between the Honeywell Smart and our control thermometer.

This thermostat was up to two degrees off consistently in our tests — enough that we were concerned that we had purchased a defective model. Upon contacting customer service, we were informed that it is NORMAL for it to be off from the actual temperature anywhere between 2-4 degrees. The remaining two thermostats were decently consisted, averaging about a degree off of our reference thermometer.

Conclusion


There are many reasons to consider purchasing a smart WiFi thermostat: these products can save you energy and money, integrate with existing smart home systems, and simplify your life, but selecting the right wifi thermostat for your home can be a difficult one — especially if you have an older home or an unconventional HVAC system. While all of these models should work with most systems in a DIY install, don't hesitate to contact a professional if you feel lost, or if your wiring system is drastically different than what is described in the model's installation guide. Whether you are looking for the newest piece of tech to integrate into your smart home ecosystem, or are simply looking for something to keep an eye on things while you are away, there is a product for you. Hopefully, this has helped narrow down your choices in your quest to find the best.


Austin Palmer, David Wise, and Jenna Ammerman