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Model #ST75W

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Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, C-Wire Required

  • Smart touchscreen thermostat saves up to 23% on HVAC energy
  • Easy DIY installation in 30 minutes or less - C wire required
  • Works with Amazon Alexa, Google Assistant and Apple HomeKit
  • See More Details

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Product Overview

The Sensi Touch Wi-Fi smart thermostat puts comfort control at your fingertips whether you are at home or on-the-go. Just a tap of the easy-to-use touchscreen display or free mobile app lets you remotely access, change or program your home temperatures. Anytime. Anywhere. Sensi mobile app guides you through each step of the DIY installation process. A common wire (c-wire) is required for all system types. Refer to our online compatibility resources on our website to make sure Sensi thermostat will work in your home. Once your Sensi thermostat is up and running, you can let your location automatically adjust your temperature settings with geofencing or use the intuitive controls to create a custom schedule, to save about 23% on your HVAC energy usage*. *Energy savings calculated by comparing operation time for a nationwide sample of Sensi users with temperature adjustments averaging 4 degreeF 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).
  • Reader's Choice BEST SMART THERMOSTAT by PCMag and Editor's Choice BEST OVERALL SMART THERMOSTAT by USA Today's Reviewed
  • SAVE ABOUT 23% ON HVAC ENERGY: By adjusting the temperature using flexible scheduling, remote access, and geofencing, Sensi customers saved about 23% on HVAC energy usage
  • Most install in 30 minutes or less: use the built-in level, illuminated easy-click terminals and step-by-step app instructions for a quick installation, skip any extra work painting or patching the wall thanks to the standard thermostat size
  • Compatibility requires C-wire: extensive compatibility with HVAC equipment found in most homes, all system types require a common wire (C-wire), 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, and Samsung SmartThings smart home platforms
  • Sensi multiple thermostat manager: control, batch and group unlimited number of thermostats from a single dashboard for just $10 per thermostat per year
  • Usage reports: monitor current day and historical heating, cooling and fan runtimes right in the app
  • Get rebates: find utility rebates in your area through the rebate finder at sensi.emerson.com/rebates
  • Control from anywhere: remotely control your home comfort from your smartphone or tablet using the Sensi mobile app for Android and iOS devices
  • Smart alerts: Sensi features smart alerts to help detect extreme temperature and humidity levels in your home
  • How to install and replace your thermostat

  • Click here for more information on Electronic Recycling Programs
  • California residents

Info & Guides

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Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, C-Wire Required
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NameSensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, C-Wire RequiredNest Learning Thermostat - Smart Wi-Fi Thermostat - Stainless SteelNest Learning Thermostat - Smart Wi-Fi Thermostat - WhiteNest Learning Thermostat - Smart Wi-Fi Thermostat - Polished Steel
FeaturesAuto Changeover,Backlit Display,Built-in Wi-Fi,Daylight Savings Time Ready,Touch Screen,Vacation ModeDaylight Savings Time Ready,Vacation ModeRemovable InterfaceRemovable Interface
Thermostat CompatibilityUniversalUniversalUniversalUniversal
Wire ConfigurationC-WireC-WireC-WireC-Wire
Control TypePhone Controlled,TouchscreenDial,Manual,Phone ControlledDial,Manual,Phone ControlledDial,Manual,Phone Controlled
Heating & Cooling System Type2 Stage2 Stage2 Stage2 Stage
Power OptionsC-wireBattery,C-wire,HardwiredBattery,C-wire,HardwiredPlug-in
Thermostat ShapeRectangularRoundRoundRound
Voltage TypeLow VoltageLine VoltageLine VoltageLine Voltage
IncludedDisplay Base,Dry Wall Plugs,Mounting HardwareMounting Hardware,Trim PlateMounting Hardware,Screwdriver,Trim PlateMounting Hardware,Trim Plate
View ProductView ProductView ProductView Product



Display height (in.)
Display width (in.)
Product Depth (in.)
Product Height (in.)


Battery Power Type
Battery Size
Color Family
Control Type
Phone Controlled,Touchscreen
Auto Changeover,Backlit Display,Built-in Wi-Fi,Daylight Savings Time Ready,Touch Screen,Vacation Mode
Heating & Cooling System Type
2 Stage
Display Base,Dry Wall Plugs,Mounting Hardware
Pack Size
Periods per Programmable Day
Power Options
Power Options
Remote Access
Remote Access
Requires Hub?
No Hub Required
Smart Home
Smart Home Enabled
Smart Home Protocol
Smart Technology
Geo Fencing,Intuitive Scheduling,Smart Home Hub Compatible,Smart Phone/Android App Compatible
Thermostat Compatibility
Thermostat Product Type
Thermostat Shape
Thermostat Type
Heating and Cooling
Voice Control Hub Required
No Hub Required for Voice Control
Voltage (v)
Voltage (volts)
Voltage Type
Low Voltage
Wire Configuration
Works With
Alexa, Apple HomeKit, Google, Siri

Warranty / Certifications

Certifications and Listings
Energy Star
Manufacturer Warranty
3 years

Questions & Answers


Does the thermostat making a clicking sound when it engages to turn on / off the furnace or airco...

Asked by BelAirCarGuy August 25, 2020

Not that I noticed

can you set it to automatically run ac if it gets above 74 degrees and run heat if it gets below ...

Asked by kit May 20, 2020

Yes, there is 3 modes: Heat Only, Cool Only, or Auto Select.

Will this work with propane heat and electric ac

Asked by George May 16, 2020

Yes. Exactly what I have.

Do hou need a C or common wire?

Asked by John January 1, 2020

Yes. It needs constant power to work.

Can I set up two different thermostats on their own schedules for two zones and control them from...

Asked by Sunny December 7, 2019

I have several of these t-stats in several locations. One location does have 2 t-stats controlling different zones with no issues at all. They are all under the same app on the phone. I have had very little disconnection of communication over the last couple years. But more important, I don't pay for any monthly or yearly service fees. I like these more than any other on the market so far and customer service I needed during one of my installs was the best.

Can I control cooling by by setting % humidity rather than temperature

Asked by WILLIAM November 29, 2019

No just temperature

what are the dimensions of this guy

Asked by skip August 13, 2019

5 5/8 inches wide by 3 3/8 inches tall

Does this thermostat have a lock out features? I want to lock in the temperature.

Asked by Jesse August 10, 2019

You can disable temp adjustment at the thermostat and have it only adjustable by your phone

Can you schedule the fan separately? i.e. If the heating and cooling are set to off, the fan can ...

Asked by daPieg June 29, 2019

Just to follow up with this question, now YES, the updated app now allows you to run the fan for a % of an hour. So, if you set it to 50%, it would run the fan 30 mins every hour. This is a new option on the app, not on the thermostat itself from what I can tell.

I have a 2 wire system. Will this work with that?

Asked by Nick June 18, 2019

Absolutely not.

Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, C-Wire Required - page 2

Customer Reviews

  • 4.3
    out of 103 reviews
  • 75% recommend this product
Filter by:
Showing 1-10 of 103 reviews
Hands down, one of the most carefully thought-out products out there. You first download the Emer...
Hands down, one of the most carefully thought-out products out there. You first download the Emerson Sensi App to your phone. Then, it guides you meticulously through the installation procedure. You select which wires you currently have coming from your HVAC or Heat Pump, then it shows you on screen where to connect them. The thermostat even contains an LED light which you can temporarily switch on to see the wires better, and then serves as a backlight after installation. The thermostat has a unique bar code which you scan with the app, and it knows exactly the type and id of the thermostat. Pick the WIFI network name, enter the password, and you're done. Adding another thermostat is easy also. Once installed, the same app is used to control the thermostat. My only complaint is that you cannot set the thermostat heat lower than 45 degrees. I installed the thermostat in a mountain vacation house, and just want to keep the house interior a little above freezing (like 38 degrees).
by Handyman
Does have circulation option
I've read quite a few reviews stating this thermostat doesn't have the circulation option for the fan. That is false, I have this turned on with my system. See attached photo.
by Mitch
1 person found this helpful
The Sensi Touch WiFi thermostat has some good potential, but there are some flaws that need to be...
The Sensi Touch WiFi thermostat has some good potential, but there are some flaws that need to be corrected. I have contacted Emerson with these issues, but they seem uninterested in correcting this. The biggest issue is the ease at which the thermostat is reset to factory defaults, losing all programming, setttings, wifi, and access. I tried the keypad lockout feature, but it took my 11 year-old less than one minute to figure out how to bypass this feature. When the keypad lockout feature is activated, the Menu button on the thermostat screen is still active, which leads to the "About Thermostat" button, which then leads to the "Factory Reset" button. This instantly disconnected the thermostat from WiFi and you will lose all settings, programming, and control, thus giving the user standing at the thermostat full control which is a problem since my kids like to turn on the A/C in the winter even though it is less than 40 degrees outside. Other than these issues, the thermostat and software work very well.
by Papawhealie
temp failure
My Sensi touch that i got only a couple weeks ago suddenly started reading the temp at 99° while the room temp was closer 60°. The worst part is we were out of town while this happened and my parents were watching our kids and dogs for us. There was zero help from technical support. The master reset didnt work. I even had my parents remove the face and leave it off for a half an hour which seem to help for about 15 minutes before returning to 99°. Again the temp in the house was not 99°. Luckily i had inly the heat turned in or the AC would have kicked on cooling the house and likely damage my ac unit. The outside temp was below 32° and was expected to reach the low teens that night. This product and lack of technical support isnt worth the risk. Not sure if i was the only lucky one to have this issue but the email support said they had a higher then normal contact volume and response maybe delayed. Clearly they’re having issues with their products.
by Johnny
7 people found this helpful
Horrible problems
doesn't work very much if you wish to control remotely
by tracyr
1 person found this helpful
We have had 4 of these in our office for approx. 2 weeks and they are working very well. We had o...
We have had 4 of these in our office for approx. 2 weeks and they are working very well. We had one base unit that was defective but Home Depot's customer service replaced it without issue. Setting up the app was simple, although it did take a little longer than I had thought. I had to factory reset a few of the thermostats before they would connect to the wifi network. I really like the fact that I can monitor the temperature of the office while I am away from the office. I have also been able to setup schedules so that the office should be comfortable during Business Hours and then the temps will drop during Non-Business Hours. We bought at the recommendation of our HVAC installer for commercial installs.
by msu2050
Excellent Thermostat Replaced a 20 year old thermostat. Tired of going up and down the stairs to ...
Excellent Thermostat Replaced a 20 year old thermostat. Tired of going up and down the stairs to adjust the temperature. Old thermostat did not use a “c” wire. Setup is thru the Sensi app. The app guided me thru finding and installing the “c” wire in the wall and in the furnace. The “c” wire is needed to power the unit and Wi-Fi. Setup could not be easier. The app gives you written instructions and video. Total time was an hour including install and setting up schedules for Heat, AC and Vacation. No buttons to push just touch the screen or your device for info or changes. Display is big and can be read from down the hall. It changes color for heat (orange), AC (blue) and Standby (grey). It also has a night lit for background. Now I can adjust the temperature and/or change schedules from my chair downstairs or anywhere in the world from my IPad.
by Joe
1 person found this helpful
Great Look..& Easy to use!
Great Look..& Easy to use!
by Max
This is a very smart little thermostat and relatively easy to program and use. It has many featur...
This is a very smart little thermostat and relatively easy to program and use. It has many features although you dont have to use them all. I like that I can program it on the app and when coming home on vacation, I can change the temperature while in the car. If you forget to set the thermostat before vacation, you can do it from the other side of the world. You can hook multiple thermostats up to the app. The design is user-friendly, both the app and thermostat. The installation on the app makes it easy. My installation was a bit tricky because my "common" wire wasn't hooked up from the furnace/air handler. The common wire provides the thermostat with constant power as it does not take batteries. Once powered up, I was easily able to make my schedule. The app also lets you hook the thermostat up to Siri, adjust the temperature if the thermostat is in a warm/cold spot and slow on/off cycles to extend the life of your AC/furnace. You can also program it to warm/cool over longer periods so you dont have such noticeable temperature spikes and drops. There is also a beta version location feature which if your phone is three or more miles from the house it will drop +/- 3 degrees. The touch-screen is nice and the thermostat is two pieces. One piece is attached the wall, the other is the touchscreen which clicks into the wall-mounted piece. OF NOTE! After setting everything up, I removed the face to take a picture then re-attached it. Afterwards the thermostat was not on WiFi and I essentially had to reinstall it. For my installation, my previous thermostat took a newer four wire cable but my 1950s home also had the original 3 wire cable in the wall. What I did was run the common wire off the old 3 wire, using one of the wires. The common wire coming off the furnace/air handler was not wired as well so I had to open it up, splice the wire and screw it into the "COM" terminal. I then pig tailed the common wire from the furnace to one of the old wires in the 3-wire. Then the thermostat powered up! The app will walk you through which wire is which and where to put it. Very easy. The wall-mounted portion of the thermostat has a built-in level which I found very handy. I had to do some drywall repair as this thermostat showed an unsightly area from previous installs.
by SteveVA
4 people found this helpful
Easy replacement for nearly any style of thermostat. I had the original Sensi installed upstairs ...
Easy replacement for nearly any style of thermostat. I had the original Sensi installed upstairs and the Sensi Touch Black installed downstairs and have been extremely pleased with the products. I decided to upgrade to the newer Sensi Touch in white on the second floor of my home. Compared to the original Sensi, the Sensi Touch adds a number of new features. The base is smaller, has some sort of integrated power instead of requiring batteries, has a much better connection system for the wires (push in instead of screw down) and includes an integrated LED that lights up the base to make it easier to see as you connect the wires. I appreciated the design choice to keep the mounting holes in identical locations as the original base which simplified the install. Moving to the thermostat itself, the new model is also smaller than the old model and features a color touch screen which brings with it a number of enhancements. I can now see my current schedule on the screen so I can tell when temperatures will change based on schedule. The display changes colors depending on mode (grey for not active, blue for cooling and red for heating). When not in active use it goes into sleep mode (this can be disabled by a menu setting) which lowers the display brightness and only shows the current temperature. Overriding current schedule temperature is easy with a simple tap of the screen to set the temp you would like. The menu provides additional options like Sleep mode, Nightlight (turns on the base LED), Wi-Fi setup, Equipment setup and schedule programming. That last option is an upgrade over the old model. With the original Sensi you could only perform schedule changes from the smart phone app. With this model you can disable Wi-Fi on the thermostat and then use the touch screen to setup your schedule. Installation is super simple. The app asks you to select the thermostat model you purchased then it walks you through a step by step process including pictures of replacing your existing thermostat. It even lets you take a picture in app of the existing wiring for reference. Before you disconnect any wires it has you identify the connections in use and then tells you if the Sensi is compatible with your system. Assuming it is compatible, it walks you through labeling the wires with included stickers because the Sensi connections might differ from your existing. You are then guided to turn off the power, disconnect wires, remove old thermostat, install base, connect wires, install thermostat, restore power and setup your Wi-Fi connection. After that you can setup scheduling if you like. If you have basic DIY skills, you can install this product on your own with the guidance of the app. More importantly, you can download the app for free before you buy the Sensi and walk through the beginning setup steps to determine compatibility with your system. One thing to note, heed the warning and actually turn off the power to your furnace (the furnace powers the thermostat not you A/C compressor which is a different breaker). If power is on when you work on the wiring, you can easily short the wires. It may produce a small spark but the damage that will do to your system can be tremendous, especially on older systems that are not fuse protected, you can blow out the control board and transformer which can cost hundreds of dollars to replace. The Sensi Touch is compatible with Apple HomeKit, Amazon Echo and Wink smart home platforms. It also includes an optional GeoFencing programming mode where the thermostat will automatically adjust the temperature by 4 degrees when it detects your phone has left the house. Where the product could be improved? I think an option to display the time instead of temp or time and temp together on the sleep screen would be helpful. I also think the sleep screen could be enhanced with set temp as well as current temp. Finally, I think setup could be improved by allowing one to transfer schedules from the old thermostat into the new thermostat (assuming they are both Sensi models). Unfortunately, once a Sensi thermostat is removed from power/Wi-Fi, the app is unable to display any data about it. This doesn’t apply to most installs but for the few of us that upgrade to newer Sensi models it would be a huge help.
by RJJ21
2 people found this helpful
Showing 1-10 of 103 reviews