Internet #301231478

Model # ST55

Store SKU #1002348238

0786710554827

Emerson Sensi Wi-Fi Smart Thermostat for Smart Home

  • Touchscreen thermostat with smart alerts to monitor temperatures
  • Requires C-wire configuration for installation
  • Compatible with Amazon Alexa and Google Assistant
$ 129 00

Frequently Bought Together

Frequently Bought Together

Product Overview

  • Touchscreen thermostat with smart alerts to monitor temperatures
  • Requires C-wire configuration for installation
  • Compatible with 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).
  • Reader’s Choice BEST SMART THERMOSTAT by PCMag and Editor’s Choice BEST VALUE SMART THERMOSTAT by USA Today’s Reviewed
  • 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 in-app system usage
  • Most install in 30 minutes or less: use the built-in level 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
  • 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, check system and router compatibility at sensi.emerson.com/compatibility
  • Smart home compatible: works with Amazon Alexa, Google Assistant, Apple HomeKit (c-wire required), 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
  • Circulating fan: air circulation may improve indoor air quality by helping to regulate temperature and prevent buildup of particles and mold
  • How to install and replace your thermostat












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

Product Overview

  • Touchscreen thermostat with smart alerts to monitor temperatures
  • Requires C-wire configuration for installation
  • Compatible with 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).

  • Reader’s Choice BEST SMART THERMOSTAT by PCMag and Editor’s Choice BEST VALUE SMART THERMOSTAT by USA Today’s Reviewed
  • 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 in-app system usage
  • Most install in 30 minutes or less: use the built-in level 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
  • 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, check system and router compatibility at sensi.emerson.com/compatibility
  • Smart home compatible: works with Amazon Alexa, Google Assistant, Apple HomeKit (c-wire required), 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
  • Circulating fan: air circulation may improve indoor air quality by helping to regulate temperature and prevent buildup of particles and mold
  • How to install and replace your thermostat












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

Info & Guides

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Ratings (1487) (1276) (501) (4020)
Thermostat Shape Rectangular Rectangular Rectangular Rectangular
Voltage Type Low Voltage Low Voltage Low Voltage Millivolt Voltage
Control Type Touchscreen Phone Controlled Phone Controlled,Touchscreen Phone Controlled,Touchscreen
Included Mounting Hardware Batteries,Display Base,Mounting Hardware,No Additional Items Included Mounting Hardware,Power Extender Kit Mounting Hardware
Heating & Cooling System Type Single Stage 2 Stage 2 Stage 2 Stage
Wire Configuration 4-Wire C-Wire 4-Wire C-Wire
Features Auto Changeover,Backlit Display,Built-in Wi-Fi,Daylight Savings Time Ready,Outdoor Temperature Display Auto Changeover,Backlit Display,Battery Back-Up,Built-in Wi-Fi,Daylight Savings Time Ready,Outdoor Temperature Display,Vacation Mode Auto Changeover,Backlit Display,Built-in Wi-Fi,Daylight Savings Time Ready,Filter Indicator,Lockable,Low Battery Indicator,Outdoor Temperature Display,Touch Screen,Vacation Mode Auto Changeover,Backlit Display,Daylight Savings Time Ready,Filter Indicator,Outdoor Temperature Display,Vacation Mode
Power Options C-wire Battery,C-wire,Hardwired Hardwired Hardwired
Thermostat Compatibility Universal Universal Universal Universal
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
White
Color/Finish
White
Control Type
Phone 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
Pack Size
1
Periods per Programmable Day
4
Power Options
Hardwired
Power Options
Battery,C-wire,Hardwired
Remote Access
Remote Access
Requires Hub?
No Hub Required
Returnable
180-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

Warranty / Certifications

Certifications and Listings
Energy Star
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
White
Color/Finish
White
Control Type
Phone 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
Pack Size
1
Periods per Programmable Day
4
Power Options
Hardwired
Power Options
Battery,C-wire,Hardwired
Remote Access
Remote Access
Requires Hub?
No Hub Required
Returnable
180-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

Warranty / Certifications

Certifications and Listings
Energy Star
Manufacturer Warranty
3 Years

Questions & Answers

Does the wifi connection drop a lot?

Asked by: N8
No. Some people don't know but depending on your internet plan. You limited to a number of constant connect devices. Let say 8 devices and when you add a 9th like this smart thermostat it will drop unless so your ipad or whatever stopped and the 8th spot opens. Hence internet will not be available for your so many smart devices at all times. TV, mobile, iPads, smart Ring doorbell etc.
Answered by: Aaronucsd
Date published: 2019-08-21

Does it have an internal battery

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

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. We have two HVAC systems each with their own Sensi thermosat individually controlled and accessible via the app.
Answered by: DanB
Date published: 2020-09-18

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: Bobanshee
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
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