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81% positive over last 12 months
Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55
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Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
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Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Purchase options and add-ons
Brand | Emerson Thermostats |
Model Name | Wi-Fi Thermostat for Smart Home, DIY Version |
Product Dimensions | 1"D x 5.88"W x 3.75"H |
Controller Type | Vera, Apple HomeKit, Google Assistant, SmartThings, Amazon Alexa |
Special Feature | Filter Indicator, Clock Display, Fan Control, Auto Changeover, Daylight Savings Time Ready |
About this item
- 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 flexible scheduling, remote access, and usage reports
- EASY DIY INSTALLATION: Use the built-in level and step-by-step app instructions for a quick installation. Works with HVAC equipment found in most homes. Common wire (c-wire) is not required in most applications
- SMART MAINTENANCE: Sensi can help monitor the performance and efficiency of your HVAC system by delivering valuable usage reports, alerts about your equipment, and maintenance reminders like filter replacement
- SIMPLE CONFIGURATION: Looks and feels like a thermostat. Has buttons and fits the same space as a traditional thermostat so you don’t have to patch and paint your walls
Customer ratings by feature
Frequently bought together
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From the manufacturer
Sensi Smart Thermostat
Designed for energy savings and data privacy - to give you full control of your home HVAC. With over 100 years of HVAC experience, you can feel confident in the product you put on your wall.
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Data Privacy Protection
Sensi will not sell your personal data to third parties or leverage your thermostat data.
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Control from anywhere
Sensi's top rated app allow on the go control of your homes comfort
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Save about 23% on your HVAC Energy
Sensi helps you save energy with features like flexible scheduling, remote access and usage reports
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Smart Maintenence
Monitor your HVAC system with usage reports, alerts about your equipment, and maintenance reminders.
Product information
Brand | Emerson Thermostats |
---|---|
Model Name | Wi-Fi Thermostat for Smart Home, DIY Version |
Product Dimensions | 1"D x 5.88"W x 3.75"H |
Controller Type | Vera, Apple HomeKit, Google Assistant, SmartThings, Amazon Alexa |
Special Feature | Filter Indicator, Clock Display, Fan Control, Auto Changeover, Daylight Savings Time Ready |
Color | White |
Specific Uses For Product | Boiler, Air Conditioner, Heat Pump, Furnace |
Connectivity Technology | Wi-Fi |
Included Components | Thermostat, free mobile app, 2 AA batteries, mounting hardware, wire stickers, installation guide, welcome guide with Sensi code, warranty booklet |
Power Source | Corded Electric |
Item Weight | 13.6 ounces |
Voltage | 24 Volts (AC) |
Material | Plastic |
Shape | Rectangular |
Display Type | LED |
Screen Size | 5 Inches |
Control Type | Button Control |
Control Method | Voice |
Connectivity Protocol | Wi-Fi |
Mounting Type | Wall Mount |
Style | DIY |
Backlight | Yes |
Number of Batteries | 1 AAA batteries required. (included) |
Department | Unisex-Adult |
Manufacturer | Emerson Climate Technologies |
ASIN | B01NB1OB0I |
Country of Origin | Mexico |
Item model number | ST55 |
Batteries | 1 AAA batteries required. (included) |
Customer Reviews |
4.5 out of 5 stars |
Best Sellers Rank | #4,487 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #11 in Home Programmable Thermostats |
Is Discontinued By Manufacturer | No |
Assembly required | No |
Number of pieces | 1 |
Warranty Description | 3 years. |
Batteries required | Yes |
Import | Made in the USA |
Warranty & Support
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Product Description
Sensi smart thermostats are designed for energy savings and data privacy – to give you full control of your home HVAC. With over 100 years of HVAC experience and manufactured by Emerson, you know our expertise already, even if you didn’t realize it. Emerson produces many of the HVAC parts that our smart thermostats control, so you can feel confident in the product you put on your wall. With our top-rated mobile app and easy installation process, customers of all comfort levels can make the switch to a Sensi smart thermostat. In addition, our customer service team of HVAC experts is always available to help you through any questions you might have. *For more information on Compatibility, Energy Savings, and Privacy Protection, please refer to the “Product Documentation” section below.
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This Item Emerson Thermostats Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55 | Recommendations | dummy | dummy | dummy | dummy | |
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Price | -15% $109.99$109.99 List: $129.99 | $86.78$86.78 | $129.99$129.99 | -18% $82.00$82.00 List: $99.99 | -19% $72.99$72.99 List: $89.99 | -12% $184.95$184.95 List: $209.99 |
Delivery | — | Get it as soon as Tuesday, Apr 2 | Get it as soon as Tuesday, Apr 2 | — | Get it as soon as Tuesday, Apr 2 | Get it as soon as Tuesday, Apr 2 |
Customer Ratings | ||||||
Easy to install | 4.7 | 3.9 | 3.8 | 4.1 | 4.2 | 4.5 |
Temperature Control | 4.6 | 4.1 | 3.8 | 3.8 | — | 4.7 |
Tech Support | 4.1 | 3.7 | 3.7 | 3.0 | 3.4 | — |
Alexa integration | 4.4 | — | 4.5 | 3.5 | 4.2 | — |
Easy to use | — | 4.2 | 4.0 | — | 4.1 | — |
Sold By | Fba Sales | Amazon.com | MOESGO Official Store | Jos Incentives | Amazon.com | Amazon.com |
control method | voice | touch | voice | application, touch | application | voice |
connectivity protocol | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi |
power source | Corded Electric | Corded Electric | — | Corded Electric | Battery or C-wire | Common wire |
controller type | Amazon Alexa, Google Assistant, Apple HomeKit, SmartThings, Vera | Amazon Alexa, Google Assistant, IFTTT, SmartThings, Hand Control | Google Home, Amazon Alexa, Google Assistant | Amazon Alexa, Apple HomeKit, Google Assistant, iOS, Android | Hand Control, Amazon Alexa, Google Assistant, SmartThings | Amazon Alexa, Google Assistant, SmartThings, Hand Control |
specification met | — | energy,energy star certified | energy | Energy Star | Energy Star | Energy Star |
material | Plastic | Plastic | — | Plastic | — | — |
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the adjustability, accuracy, and Alexa integration of the HVAC control thermostat. For example, they mention it's very configurable, easy to set up multiple schedules, and allows them to set personalized temperature profiles. They're also happy with the quality, value, and ease of installation. That said, opinions are mixed on connectivity.
AI-generated from the text of customer reviews
Customers find the installation of the HVAC control thermostat to be easy. For example, they mention the app is well implemented, easy to follow directions, and simple to install and configure. Some say the app walks them through the complete install and programming the thermostat is also easy. They mention that the WiFi setup is easy and that using it is straight forward.
"...Overall a great thermostat. Easy setup. Easy to use. Great features. Very responsive when using your phone. 5 stars plus!!" Read more
"...It’s very simple, but also does the Wi-Fi thing very well. Scheduling, humidity monitoring, statistics, it all works very well...." Read more
"...Using it is very straight foward. Basic functionality is all supported like setting a temperature and setting a schedule...." Read more
"...All around, everything works great. Love this product - makes it very convenient to remotely control your AC.Update: 3/1/2020..." Read more
Customers like the quality of the HVAC control thermostat. They say it works great, is easy to install, and works right away. Customers also say it's completely reliable, does what they need it to do, and is not over-featured.
"...It’s very simple, but also does the Wi-Fi thing very well. Scheduling, humidity monitoring, statistics, it all works very well...." Read more
"...a few months of use, so as far as I can tell, this unit is completely reliable - it does what I need it to do, no more and no less...." Read more
"...All around, everything works great. Love this product - makes it very convenient to remotely control your AC.Update: 3/1/2020..." Read more
"...Overall, this is a really amazing unit and I have been really glad to have it. It was seriously a breeze to instakl and set up and functions well...." Read more
Customers like the accuracy of the HVAC control thermostat. They say that it is easy to adjust temperatures in the app, set up schedules, and use occupancy detection. They also appreciate the ability to change temperature remotely with their phone. They like that they are able to set personalized temperature profiles and ensure that their AC system is running at its best. They mention that the installation allows them to set up various cooling and heating programs to run. They appreciate that it has a good temperature variant that others don't have. Customers also like that it can automatically turn on either heating or cooling for these shoulder seasons.
"...Once fully connected you can easily adjust temperatures in the app, set up schedules and use a variety of options e.g. display humidity etc...." Read more
"...The accuracy of the t-stat is pretty accurate (within 0.5 degrees of my infrared thermometer)Overall, love the product...." Read more
"...5. I like that you can do things like temp and humidity offsets, have the AC turn on to help maintain proper humidity levels..." Read more
"...in addition to walking you through the installation, allows you to set up various cooling/heating programs to run automatically, as well as change..." Read more
Customers like the value of the wifi thermostat. They say it's a great product, reasonably priced, and a worthwhile investment for any modern home. Customers also mention that it'll save them money on their utility bills.
"...It’s not very expensive, it’s simple and it works great." Read more
"...compatibility with various HVAC systems make it a worthwhile investment for any modern home." Read more
"...these as a quality programming Wi-Fi connected thermostat at a reasonable price and not over-featured." Read more
"...Overall I say this is so worth the price. I should have bought this a long time ago...." Read more
Customers like the adjustability of the HVAC control thermostat. They say the app is very informative, very configurable, and granular. They appreciate the ability to set up schedules and monitor usage, as well as the ability change the schedule without having to program it at the thermostat. Customers also like that the app offers all kinds of customization options and the flexibility to create multiple programs with as many or as few schedule steps as they wish.
"...fully connected you can easily adjust temperatures in the app, set up schedules and use a variety of options e.g. display humidity etc...." Read more
"...It’s very simple, but also does the Wi-Fi thing very well. Scheduling, humidity monitoring, statistics, it all works very well...." Read more
"...It works exactly as designed.You can make t-stats adjustments either by wifi or LTE on your mobile. No delay in signal...." Read more
"...Well implemented app and easy to follow directions for various types of applications. If you don’t have a “C” wire, it’s relatively easy to add one...." Read more
Customers are satisfied with the integration of the HVAC control thermostat with Alexa. They mention that it works well, is easy to install, and pairs easily. Customers also appreciate the smooth integration with Alexia for voice recognition.
"...- Very easy to connect to WiFi and integrate with Google Home...." Read more
"...Paired easily with Alexa. Best part: I received a rebate for the entire cost of the thermostat from our gas company!..." Read more
"...Works great with Alexa & I must admit that it's pretty nice to tell Alexa to turn up the heat on those cold morning before I even get out of bed...." Read more
"...Sensi app is wasy to set and change. Alexa compatibilty is better than other smart devices. Amazon's basics model requires c-wire installation...." Read more
Customers like the interface of the HVAC control thermostat. They say the app is a dream to use, informative, configurable, and granular. They also say the remote control through the app works great, and the installation process is super easy. Customers also mention that there are tons of YouTube vids to help them out.
"...The app is excellent, it’s very simple and works great. Installing it also was very easy, even without a c-wire...." Read more
"...Not having any electrical wiring experience, the app was SUPER helpful...." Read more
"...HOWEVER, the setup app will not progress if the user doesn't indicate that they have a C-wire...." Read more
"...The android installed app is so good it changes color while viewing if the (in my case) the heat is actually running...." Read more
Customers have mixed opinions about the connectivity of the HVAC control thermostat. Some mention that the installation and setup process went smoothly, while others say that it wouldn't connect to wireless. Some customers also report issues with their phones not being able to connect to the app, and the unit disconnects from WiFi.
"...WiFi connection was made quickly although the thermostat did take 30 or so seconds to be fully responsive to my phone after I thought the connection..." Read more
"...My issues included constant dropping of the Wi-Fi and inconsistent operation of the heater and blower / fan...." Read more
"...No delay in signal. My wifi has never lost signal and has stayed up now for 1 week.The t-stat itself (on wall) has very few settings...." Read more
"...Installation was a little on the fussy side; they lost wifi connection a few times, but I think that's the fault of my Eero mesh system more than..." Read more
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Once I confirmed compatibility, and after delivery, following the instructions on the app took me through the process of removing the old thermostat and installing the Sensi. It was a very easy and logical process which even a novice at home improvement can follow. The only slight hitch in setting up the system was ensuring that the wire connection was secure - a couple of the wires came loose after I thought I had screwed them in. Really not a big deal but I gently tugged on the wires to ensure that they were not loose. The Sensi thermostat attaches to The wall by clipping into the wall plate that is provided. Luckily for me the old wall plate holes were in the right spot for the new Sensi wall plate. Before clipping the thermostat on ensure that the wires are flush with the wall as instructed by the app.
Connecting to WiFi was fairly easy and it was done through the app on my iPhone. The thermostat is only compatible with 2G WiFi so you have to make sure your phone is connected to the 2G network while going through this part of the setup if you have a dual band router (you can switch your phone back to the 5G network after if you wish). WiFi connection was made quickly although the thermostat did take 30 or so seconds to be fully responsive to my phone after I thought the connection was completed (I initially thought I needed to go through a troubleshooting process but did not need to complete that process).
Once fully connected you can easily adjust temperatures in the app, set up schedules and use a variety of options e.g. display humidity etc. There is also a geofencing option if you wish to use that. I set up my iPhone to be able to use Siri to adjust temperatures. You’ll need to set up your iPhone Home app for that. Once again the app runs you through all the steps to do that. I also set up my wife’s phone for her to have the feature that allows her to use Siri. Initial attempts to set her Home app to connect with the thermostat using Siri were unsuccessful until I realized that I could simply share my iPhone Home app settings with hers (just had to make sure to switch to the shared home app profile and not the original default one on her phone). If you do not wish to use Siri you can simply use the controls in the Sensi app and do not have to go though the Home app set up.
I’ve had the thermostat for a week now and I love it. The thermostat is very responsive to changes made within the Sensi app or when using Siri (usually within 1-2 seconds). I also like that I can view ‘Usage’ within the app to see how long the furnace has been active. The app will also allow you to check to see if you are eligible for rebates based on energy savings programs for your area.
Of course if you need to change app settings on the thermostat itself it is very easy to do so. There is a feature in the app that allows you to lock the wall display and only be able to change settings, temps etc through the app if you do not want people to change temps or settings through the wall display.
Overall a great thermostat. Easy setup. Easy to use. Great features. Very responsive when using your phone. 5 stars plus!!
i’ve seen other reviews say that the batteries don’t last very long. This is not in the case in anyway for me. As I said before, I’ve had one of these for about a year – with the same set of batteries. And if you look at the battery meter it still has full three stripes, that is the battery is still totally full after a year. So at least in my experience, you don’t have to worry at all about not having a C wire – the battery seems to be working 100% OK.
so, I would totally recommend buying this. Again, I bought a second one because I liked the first one so much. It’s not very expensive, it’s simple and it works great.
The installation was very straight forward and the included bubble level made mounting it horizontally level quite easy. The app guides you through install and as long as you know what your wires are, you shouldn't have any problem.
Using it is very straight foward. Basic functionality is all supported like setting a temperature and setting a schedule. If you generally just want to do the most basic of tasks then this thermostat will definitely suffice. The information is all displayed on the screen. The screen displays both time and humidity, but alternates it - so if you want to know the humidity and it currently displays time, just wait a few second and it will switch. The associated application is also pretty useful and lets you see and control the unit from your smart phone. If you register an account you also can get notifications - for example, when the humidity is above 70% you'll get an email (at which point you can turn on the dehumidifier or AC). I personally haven't had any issues with it after a few months of use, so as far as I can tell, this unit is completely reliable - it does what I need it to do, no more and no less.
The higher end models will also obviously have all the same functionality along with even more advanced functionality I'm guessing, but if you don't really want something super fancy and like the traditional appearence of this unit, then this will be more than adaquate. Also if you don't have the C-wire then you simply won't have too many options anyway. If however you really want even more smart features and want something more futuristic, then well a higher-end model might suit you more.