Model # ST55

Internet #301231478

Store SKU #1002348238

0786710554827

Emerson

Sensi Wi-Fi Thermostat for Smart Home

  • Control from across the room or across the country via mobile app
  • Reduce energy usage with geofencing, scheduling and remote access
  • Works with Apple HomeKit, Amazon Alexa and Google Assistant
$ 129 00
store icon Loading Buying Options...
package icon Loading Buying Options...
Sorry, but we ran into issues loading these options. Please try refreshing.

Frequently Bought Together

Frequently Bought Together

Product Overview

  • Control from across the room or across the country via mobile app
  • Reduce energy usage with geofencing, scheduling and remote access
  • Works with Apple HomeKit, Amazon Alexa and Google Assistant
From across the room or across the country, your Sensi Wi-Fi thermostat makes it easy to remotely control and schedule your home comfort - Anytime. Anywhere. Sensi thermostat does not require a common wire (c-wire) for most installations, so it is compatible with the HVAC equipment in many homes in U.S. & Canada. A c-wire is required for heat-only, cool-only and heat pump (without aux) systems, and for use with Apple HomeKit. Check to make sure it will work for you at sensi.emerson.com/compatibility. Put your comfort on your terms with geofencing or 7-day scheduling option with the ENERGY STAR certified Sensi thermostat. Both energy saving features you save about 23% on your HVAC energy usage, so you can save money without compromising your comfort. Energy savings calculated by comparing operation time for a nationwide sample of Sensi users with temperature adjustments averaging 4°F vs. users with no adjustments. Savings vary based on equipment type/condition, insulation, climate & temperature adjustment size/frequency. Based on survey results of 2120 respondents that purchased and installed a Sensi thermostat in 2018, approximately 70% reported installing in 30 minutes or less. Adding a common wire may impact installation time. Does not work with electric baseboard heat and some other systems. System requirements for mobile app: iOS - 10.0 or above Android - 4.2 or above (5.0 or greater to use the Geofencing feature).
  • Named the ‘Best Value’ smart thermostat of 2018 by USA Today’s Reviewed.com
  • Save about 23% on hvac energy: the ENERGY STAR certified Sensi thermostat helps you save on your HVAC energy costs, with features like geofencing, 7-day flexible scheduling, remote access and energy usage reports
  • Get rebates: find utility rebates in your area through the rebate finder at sensi.emerson.com/rebates
  • Most install in 30 minutes or less: with step-by-step instructions and video tutorials right in the mobile app, most people install Sensi in 30 minutes or less
  • Extensive compatibility: works with the HVAC equipment found in most homes –  a c-wire is required for heat-only, cool-only and heat pump systems without aux
  • To check system and router compatibility, refer to our online compatibility resources at sensi.emerson.com/compatibility
  • Smart home compatible: works with Amazon Alexa, Google Assistant, Apple HomeKit (c-wire required) and Wink smart home platforms
  • Control from anywhere: remotely control your home comfort from your smartphone or tablet using the free Sensi mobile app for Android and iOS devices
  • 3-year warranty
  • How to install and replace your thermostat
























  • Click here for more information on Electronic Recycling Programs
  • California residents see Prop 65 WARNINGS

Product Overview

  • Control from across the room or across the country via mobile app
  • Reduce energy usage with geofencing, scheduling and remote access
  • Works with Apple HomeKit, Amazon Alexa and Google Assistant
Model #: ST55
Sku #: 1002348238
Internet #: 301231478

From across the room or across the country, your Sensi Wi-Fi thermostat makes it easy to remotely control and schedule your home comfort - Anytime. Anywhere. Sensi thermostat does not require a common wire (c-wire) for most installations, so it is compatible with the HVAC equipment in many homes in U.S. & Canada. A c-wire is required for heat-only, cool-only and heat pump (without aux) systems, and for use with Apple HomeKit. Check to make sure it will work for you at sensi.emerson.com/compatibility. Put your comfort on your terms with geofencing or 7-day scheduling option with the ENERGY STAR certified Sensi thermostat. Both energy saving features you save about 23% on your HVAC energy usage, so you can save money without compromising your comfort. Energy savings calculated by comparing operation time for a nationwide sample of Sensi users with temperature adjustments averaging 4°F vs. users with no adjustments. Savings vary based on equipment type/condition, insulation, climate & temperature adjustment size/frequency. Based on survey results of 2120 respondents that purchased and installed a Sensi thermostat in 2018, approximately 70% reported installing in 30 minutes or less. Adding a common wire may impact installation time. Does not work with electric baseboard heat and some other systems. System requirements for mobile app: iOS - 10.0 or above Android - 4.2 or above (5.0 or greater to use the Geofencing feature).

  • Named the ‘Best Value’ smart thermostat of 2018 by USA Today’s Reviewed.com
  • Save about 23% on hvac energy: the ENERGY STAR certified Sensi thermostat helps you save on your HVAC energy costs, with features like geofencing, 7-day flexible scheduling, remote access and energy usage reports
  • Get rebates: find utility rebates in your area through the rebate finder at sensi.emerson.com/rebates
  • Most install in 30 minutes or less: with step-by-step instructions and video tutorials right in the mobile app, most people install Sensi in 30 minutes or less
  • Extensive compatibility: works with the HVAC equipment found in most homes –  a c-wire is required for heat-only, cool-only and heat pump systems without aux
  • To check system and router compatibility, refer to our online compatibility resources at sensi.emerson.com/compatibility
  • Smart home compatible: works with Amazon Alexa, Google Assistant, Apple HomeKit (c-wire required) and Wink smart home platforms
  • Control from anywhere: remotely control your home comfort from your smartphone or tablet using the free Sensi mobile app for Android and iOS devices
  • 3-year warranty
  • How to install and replace your thermostat
























  • Click here for more information on Electronic Recycling Programs
  • California residents see Prop 65 WARNINGS

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.

Compare Similar

Compare Similar Products
Brand Emerson Honeywell ecobee Google
Name Sensi Wi-Fi Thermostat for Smart Home Smart Wi-Fi 7-Day Programmable Color Touch Thermostat, Works with Amazon Alexa, SmartThings, Google Home, IFTTT 4 Smart Thermostat with Room Sensor and Built-in Amazon Alexa Nest Learning Thermostat 3rd Gen in White
Price
$129.00
Was $199.00
See Lower Price in Cart
Was $249.00
$199.00
Save $50.00 (20%)
Was $249.00
See Lower Price in Cart
Ratings (829) (253) (1060) (8065)
Features Auto Changeover,Backlit Display,Battery Back-Up,Built-in Wi-Fi,Daylight Savings Time Ready,Outdoor Temperature Display,Vacation Mode Auto Changeover,Backlit Display,Daylight Savings Time Ready,Filter Indicator,Outdoor Temperature Display,Vacation Mode Auto Changeover,Backlit Display,Daylight Savings Time Ready,Filter Indicator,Lockable,Outdoor Temperature Display,Touch Screen,Vacation Mode Removable Interface
View Product View Product View Product View Product

Specifications

Dimensions

Display height (in.)
9
Display width (in.)
8.375
Product Depth (in.)
.938 in
Product Height (in.)
3.75 in

Details

Battery Power Type
Alkaline
Battery Size
AA
Color Family
Whites
Color Family
White
Control Type
App Controlled
Features
Auto Changeover,Backlit Display,Battery Back-Up,Built-in Wi-Fi,Daylight Savings Time Ready,Outdoor Temperature Display,Vacation Mode
Heating & Cooling System Type
2 Stage
Hub Required
No hub connection available
Included
Batteries,Display Base,Mounting Hardware,No Additional Items Included
Periods per Programmable Day
4
Power Options
Hardwired
Power Options
Battery,C-wire,Hardwired
Remote Access
Remote Access
Requires Hub?
No Hub Required
Returnable
90-Day
Shape
Rectangle
Smart Home
Smart Home Enabled
Smart Home Protocol
Wi-Fi
Smart Technology
Intuitive Scheduling,Smart Home Hub Compatible,Smart Phone/Android App Compatible
Thermostat Compatibility
Universal
Thermostat Product Type
Smart/Wi-Fi
Thermostat Shape
Rectangular
Thermostat Type
Heating and Cooling
Voice Control Hub Required
No Hub Required for Voice Control
Voltage (v)
24v
Voltage (volts)
24
Voltage Type
Low Voltage
Wire Configuration
C-Wire
Works With
Alexa, Apple HomeKit, Siri, Wink

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
Manufacturer Warranty
3 Years

Specifications

Dimensions

Display height (in.)
9
Display width (in.)
8.375
Product Depth (in.)
.938 in
Product Height (in.)
3.75 in

Details

Battery Power Type
Alkaline
Battery Size
AA
Color Family
Whites
Color Family
White
Control Type
App Controlled
Features
Auto Changeover,Backlit Display,Battery Back-Up,Built-in Wi-Fi,Daylight Savings Time Ready,Outdoor Temperature Display,Vacation Mode
Heating & Cooling System Type
2 Stage
Hub Required
No hub connection available
Included
Batteries,Display Base,Mounting Hardware,No Additional Items Included
Periods per Programmable Day
4
Power Options
Hardwired
Power Options
Battery,C-wire,Hardwired
Remote Access
Remote Access
Requires Hub?
No Hub Required
Returnable
90-Day
Shape
Rectangle
Smart Home
Smart Home Enabled
Smart Home Protocol
Wi-Fi
Smart Technology
Intuitive Scheduling,Smart Home Hub Compatible,Smart Phone/Android App Compatible
Thermostat Compatibility
Universal
Thermostat Product Type
Smart/Wi-Fi
Thermostat Shape
Rectangular
Thermostat Type
Heating and Cooling
Voice Control Hub Required
No Hub Required for Voice Control
Voltage (v)
24v
Voltage (volts)
24
Voltage Type
Low Voltage
Wire Configuration
C-Wire
Works With
Alexa, Apple HomeKit, Siri, Wink

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
Manufacturer Warranty
3 Years

Questions & Answers

Does it have an internal battery

Asked by: Paul
Yes
Answered by: Jacy
Date published: 2018-02-24

Does the wifi connection drop a lot?

Asked by: N8
No, but it has to be connected to their server on the net and this goes down quite often for long periods of time. I tried reinstalling the phone app and now it's completely useless because although I was able to remove it from my phone, I can't reinstall it because google play thinks it's already installed. So now I have a $20 thermostat.
Answered by: thatguythere
Date published: 2019-02-13

Can multiple thermostats be installed and each be operated remotely via the app?

Can multiple thermostats be installed and each be operated remotely via the app?
Asked by: LM
Yes, I currently have one of these thermostats installed in each of two houses in different cities, and can see both, and control each one independently from the app dashboard on my phone.
Answered by: Anonymous
Date published: 2018-12-27

Does the display on the thermostat stay lit all the time as pictured in the add?

Does the display on the thermostat stay lit all the time as pictured in the add?
Asked by: ELB
My bad. Askj is correct. You have to have c wire attached but turn it on and have it stay lit, it is in the app under settings/advanced settings. I just stalled it and it works like a charm.
Answered by: MadmanMike
Date published: 2017-11-11
  • y_2019, m_5, d_22, h_4CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.12
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_201
  • loc_, sid_301231478, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=BEST_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=POSITIVE_ANSWER_FEEDBACK_COUNT, direction=DESCENDING), SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 63ms
  • QUESTIONS, PRODUCT

Customer Reviews

Sensi Wi-Fi Thermostat for Smart Home is rated 4.4 out of 5 by 829.
Rated 5 out of 5 by from I am the facility manager for a church that has 17 HVAC units. We run Sensi because it saves us a... I am the facility manager for a church that has 17 HVAC units. We run Sensi because it saves us an amazing amount of money. When you subscribe to the multiple thermostat manager it enables me to easily program and manage all of those systems so that we only run when needed. Our Gas bill has dropped by almost half year over year because I can manage these systems much more effectively. The thermostats themselves are not inexpensive but the recoup for us will be quite quick. I am anxious to see how we do in the summer. We have many community groups that use our facility and that means that thermostats get reset a lot. With the online manager I can watch for them to leave and reset the thermostats. I prefer to do this over locking the units out so the users cannot change them (I would like them to be comfortable and welcome) but to be able to "snap-back" after they leave from wherever I am is of great value!.
Date published: 2019-02-13
Rated 5 out of 5 by from Best buy ever I have a total smart home now even sprinkler. I did it all myself and if you have questions i have answers. The last was the ac. I searched thermostats and found this one. Wow i looked at yhe 200 plus ones and cant figure out why so much. This has everything the high dollar ones do and it works just fine. 10 min install and set my program. Now no worries when your in that season when you need ac on in the day and heat at night. It auto switches over and back. Geo fence and also when the wife wants more heat she can just use the wall thermostat just like the old one. Save a lot of money and get the award winning emerson. I actually bought a second one for my upstairs. Now as a kicker i live in louisiana. I saw were it and Texas were doing rebates if you installed on. You got 100 dollars per thermostat snd up to 2. Well i filled out the paperwork online and got 200 from my electric company Swepco. So my thermostats were free. Check with your local electric company. You could get yours free also
Date published: 2019-02-05
Rated 5 out of 5 by from I bought two of these thermostats last year to replace regular programmables. I hooked up one for... I bought two of these thermostats last year to replace regular programmables. I hooked up one for the central ac and the zone for heat in the master bedroom & bath. I hooked up the other one for the heating zone for the main part of the 1st floor. This winter I picked up 2 more of the same thermostats for the other two heating zones (the other upstairs bedrooms and bath and the two rooms in what used to be my back porch). I thought they were an excellent value, but I also got a $75 rebate from my electric company on each. The thermostats are easy to program and are even easier when programming them all from a smartphone while relaxing on the sofa. They are also very convenient when you want to make any setting changes or just temporary adjustments without having to physically go to the thermostat or thermostats. I know that sounds a bit lazy, but on the other hand, is there anybody out there who still gets up to change the channel on their TV? The other advantage of wi-fi is that you can go out for the day and set the thermostat for energy savings while you gone (if you forgot before you left) and set it back for comfort on your way back home. All in all, it's an easier and more manageable way to conserve and save.
Date published: 2019-04-02
Rated 1 out of 5 by from Absolute junk. I got this through my energy provider in an effort to save energy. But it did quit... Absolute junk. I got this through my energy provider in an effort to save energy. But it did quite the opposite. It made my furnace run way more than it used. My furnace ran every 15 or 20 minutes with this junk and my house is WELL INSULATED with new windows installed few months ago from Home Depot. When the set temperature is reached, my furnace would shut off the fire and run the fan about a minute or so until the system turns off. There were times where this junk made my furnace turn on while it was in the process of getting turned off. It almost broke down my furnace. I'm glad I took it off. I would never recommend this to anyone. If I could give this a zero star, I would.
Date published: 2019-03-05
Rated 5 out of 5 by from I bought this over the other higher priced WiFi thermostats and was a little skeptical about the ... I bought this over the other higher priced WiFi thermostats and was a little skeptical about the quality. I have been pleasantly surprised by how easy it was to install and how well it has performed. This thermostat has reduced my utility cost by over 20% and now my house is comfortable day and night. I love its ability to program auto mode for those days when it is 30 degrees in the morning and 80 in the afternoon. This will switch between heat and cool to maintain a comfortable temperature setting all day. Great product and I highly recommend the value it brings.
Date published: 2019-04-06
Rated 5 out of 5 by from I love this thermostat. It has a large display and large buttons for changing the temperature. I ... I love this thermostat. It has a large display and large buttons for changing the temperature. I especially like that there is an app that allows me to control the thermostat using my phone and WiFi connection. It is also convenient that I did not have to add an extra wire to be able to use the WiFi and app. Although the app allows me to make and edit scheduled temperature adjustments, I enjoyed using the app while I was in bed on a cold night to make the house warmer before I got up. I also got a nice rebate from my local power company after I bought it.
Date published: 2019-03-27
Rated 5 out of 5 by from Couldn't be more perfect I am going through "the change". I was getting up every 15 minutes to adjust the heat. Now, I tell Google what to set it at. When I'm away from the house, I use my phone to keep my dogs at a comfortable level. This product is a game changer. Have recommended it to several people already. Husband LOVED that installation was idiot proof. Last but not least, customer service. I had a question. They were very knowledgeable and helpful but most important, they were kind. There isn't 1 thing I'd change about the product, the app, or customer service.
Date published: 2019-02-26
Rated 5 out of 5 by from I purchased this product to replace a faulty Nest Thermostat that quit connecting to Wi-Fi. The ... I purchased this product to replace a faulty Nest Thermostat that quit connecting to Wi-Fi. The Sensi was easy to install and get up and running right away. My favorite feature is that the thermostat itself runs on batteries. The C-Wire operates the Wi-Fi functionality. The app works flawlessly to schedule and control the Thermostat including switching modes (heating, cooling, fan). I'm also receiving a monthly email from Sensi with usage information. I highly recommend this affordable Wi-Fi Thermostat.
Date published: 2019-04-07
  • y_2019, m_5, d_23, h_5
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.12
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_829
  • loc_, sid_301231478, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_homedepot
  • bvseo_sdk, java_sdk, bvseo-3.1.1
  • CLOUD, getContent, 127ms
  • REVIEWS, PRODUCT