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Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55

4.5 4.5 out of 5 stars 20,233 ratings

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Rebates starting at $30 available from energy providers for 20149. Terms apply. See rebates
DIY
Thermostat
This item is certified to work with Alexa
WORKS WITH ALEXA
Add voice control by combining with an Alexa device
  • This item
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  • “Alexa, increase the thermostat.”

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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

Easy to install
4.7 4.7
Temperature Control
4.6 4.6
Alexa integration
4.4 4.4
Smart Features
4.1 4.1

Frequently bought together

$109.99
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Sold by Fba Sales and ships from Amazon Fulfillment.
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$41.99
Get it as soon as Tuesday, Apr 2
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From the manufacturer

Sensi Smart Thermostat on a wallby a kitchen

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.

Sensi Smart What's in the Box image

Product guides and documents

Product information

Warranty & Support

Product Warranty: For warranty information about this product, please click here. [PDF ]

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Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55


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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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Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55
Emerson Thermostats Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55
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Price-15% $109.99
List:$129.99
$86.78$129.99-18% $82.00
List:$99.99
-19% $72.99
List:$89.99
-12% $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

4.5 out of 5 stars
4.5 out of 5
20,233 global ratings

Customers 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

3,580 customers mention3,372 positive208 negative

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

2,738 customers mention2,376 positive362 negative

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

1,430 customers mention1,248 positive182 negative

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

967 customers mention796 positive171 negative

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

456 customers mention396 positive60 negative

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

450 customers mention433 positive17 negative

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

332 customers mention235 positive97 negative

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

890 customers mention443 positive447 negative

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

Easy pairing with Alexa AND a Rebate!
5 Stars
Easy pairing with Alexa AND a Rebate!
This has been so helpful for me. I used to change the temperature between night and day and half the time forget to change it back so would end up freezing or sweating. Alexa makes it easy to make the change and check the temperature any time. My son-in law installed it and there was no swearing, so I guess not too hard to do. I do want to thank the reviewer who shared the instructions for bypassing the c-wire as we needed them. Paired easily with Alexa. Best part: I received a rebate for the entire cost of the thermostat from our gas company! So not only was the thermostat a huge help, it was free!!
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