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Overview

Model # ST55C Store SKU # 1000830270

From across the room or across the country, your Sensi Smart Thermostat makes it easy to remotely control and schedule your home comfort - Anytime. Anywhere. Put your comfort on your terms with geofencing or 7-day scheduling option with the ENERGY STAR® certified Sensi thermostat. Both energy saving features save you 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 2°C versus 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. *** 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. Does not work with electric baseboard heat and some other systems. 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. System requirements for mobile app: iOS - 10.0 or above Android - 4.2 or above (5.0 or greater to use the Geofencing feature). Our highly certified Sensi support team is available seven days a week: sensi.emerson.com/support, support@sensicomfort.com, 1-888-605-7131

  1. First smart thermostat receiving the 2020 ENERGY STAR Partner of the Year award and named the 'Best Value' smart thermostat of 2020 by USA Today's Reviewed.com
  1. GET REBATES: Find utility rebates in your area through the rebate finder at emersoncanada.ca/rebates
  1. SMART HOME COMPATIBLE: Works with Amazon Alexa, Google Assistant, Apple HomeKit (c-wire required), SmartThings and Wink smart home platforms
  1. 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
  1. 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
  1. 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

Specifications


Works With (Smart Home)

Apple Homekit, Google Assistant, Amazon Alexa, Samsung SmartThings, Manufacturer App


Features

Digital Display, Backlit Display, Battery


Control Type

Touchscreen


Programmable

Yes


Built-in Wifi

Yes


Program Type

7-Day

Dimensions

Assembled Depth (in inches)
1
Assembled Height (in inches)
3.75
Assembled Weight (in lbs)
0.8
Assembled Width (in inches)
5.875
Packaged Depth (in inches)
8.5
Packaged Height (in inches)
9
Packaged Weight (In lbs)
1.53
Packaged Width (in inches)
3

Details

Built-in Wifi
Certified
Control Type
Touchscreen
Country of Origin
MX-Mexico
Eco Options
Energy Efficient
ENERGY STAR®
Features
Digital Display, Backlit Display, Battery
Power Source
Hardwired
Program Type
7-Day
Programmable
Smart Technology
Smart
Thermostat Compatibility
Heat Pump, Baseboard Heater
Works With (Smart Home)
Apple Homekit, Google Assistant, Amazon Alexa, Samsung SmartThings, Manufacturer App

Warranty / Certifications

3-year warranty
Sensi Smart ThermostatEmerson Sensi Smart ThermostatFrom across the room or across the country, your Sensi Smart Thermostat makes it easy to remotely control and schedule your home comfort - Anytime. Anywhere. Put your comfort on your terms with geofencing or 7-day scheduling option with the ENERGY STAR® certified Sensi thermostat. Both energy saving features save you 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 2°C versus 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. *** 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. Does not work with electric baseboard heat and some other systems. 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. System requirements for mobile app: iOS - 10.0 or above Android - 4.2 or above (5.0 or greater to use the Geofencing feature). Our highly certified Sensi support team is available seven days a week: sensi.emerson.com/support, support@sensicomfort.com, 1-888-605-7131
Emerson
1000830270
CAD1492024-02-22
The Home Depot Canada
Sensi Smart Thermostat is rated 4.5 out of 5 by 2004.
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Rated 5 out of 5 by from Great price for the features! When looking for a programmable thermostat for my condo, I did a lot of research to find the features I wanted for the best price. The Sensi was the right choice! My only concern was that I could install it to replace my 20+ year old basic thermostat so I contacted the company that does HVAC work in my building. They were asking over $600 just to install it! I decided to attempt it myself and it couldn't have been easier. Within 30 minutes I had installed and programmed it for the week. The required Sensi app provided step by step instructions which were clear and easy to follow. And, no "C" wire required!
Date published: 2017-11-23
Rated 5 out of 5 by from Hands down best for existing installs I did a lot of research as I did not have a c-wire in the main thermostat in my home. Nest and ecobee wouldn't work. Sensi didn't need a c wire, but it did need a relay which Sensi sent me (free of charge). Aside from being the most flexible wifi thermostat I could find for existing installations, there is no learning curve for people who want to operate it from the panel. I don't have to go through any sort of goofy tutorial with visitors who want to control the temperature of the guest room. From a design perspective it looks like any other thermostat - it doesn't draw attention to itself. I have three Sensi's in place in my home for about 5 months now. I recently bought and installed one for my parents in law. None have had to be reconnected to network as one of the previous posters has indicated. It does not "learn" like the Nests, nor does it have remote sensors to simulate multi-zone installs like the ecobee3. Scheduling is OK, and the app is OK - they could add the ability to "group" thermostats and control them in unison. But If all you want is to control your thermostat from anywhere in the world, you'll do very well with this.
Date published: 2016-12-27
Rated 1 out of 5 by from Sensi Cannot Even Sense Room Temperature Accuratel The unit has several issues the most important is that it cannot accurately sense room temperature. Also, it does not display tenths of degrees so you have no idea how tightly the temperature is being held. Third, the Sensi App does not work with IOS 9 so if you have iPhone 4s or 5 and didn't upgrade the app does not work. The unit has no capability to update it's software so any bugs are all yours courtesy of Sensi. Support tries to help but the product is so constraining in it's design and maintainability it's useless to provide support beyond simple configuration. My 2 cents is stay far away from this product period.
Date published: 2017-12-12
Rated 4 out of 5 by from Great but requires a smartphone to operate Simple to install and does not require a C wire for direct electrical connection. The complimentary mobile app is easy to use, although the scheduling feature can be bit confusing at first. Multiple people can download the app but have to login using the same account. The thermostat itself has limited features so programming schedules can only be done via the mobile app. Wish there was additional features built into the unit for programming. Great to use if you're tech savvy with your smartphone, but if you want manual override you will need to invest in a more expensive thermostat.
Date published: 2017-07-05
Rated 5 out of 5 by from Remotely controllable and Alexa compatible I had some problems with installation. The tech service number was a great help and stepped me through to correct why I couldnt get it connected. Basically, I needed to turn off the 5G network on my phone so that only the 2.4G wifi was on.Once I did that it worked perfect. I have multiple daytime schedules running. I am able to change the temperature remotely outside of the home. I dropped the temperature to 15C while I was on vacation and then set it back to normal when I got back from the airport. It is compatible with Alexa. I can give Alexa voice commands to change the temperature.
Date published: 2020-01-23
Rated 5 out of 5 by from Easy installation! After searching online for an affordable thermostat I found good reviews on the Sensi. I was a bit worried about the install as I have never done anything like that before. I didn't have to worry, the installation was super easy after downloading the app. It led me through everything step by step. Now it's installed and I love being able to control the temperature of the house using an app.
Date published: 2017-01-21
Rated 5 out of 5 by from Easiest installation! With rebate; only $21! This was by far the easiest installation ever! Emerson has an amazing app that walks you though the install. My thermostat was installed start to finish in less than 20 minutes, and works great! At the time of purchase, there was a $75 rebate on the thermostat through Home Depot and Enbridge gas. An additional $6 energy rebate was applied, along with a $10 email subscription discount, so the total I paid for a $109 thermostat, with tax was $21!! You can't go wrong!
Date published: 2019-12-30
Rated 4 out of 5 by from PSA: can only set Celsius to 1 degree increment Does everything as advertised. Super easy install with the app. I bought a transformer plug to run it because I only have a boiler with no C wire. Anyway, the thing it fails at is that you can't set the temperature to half degree increments, e.g. you can only set to 22 or 23, not 22.5 C. My old $15 thermostat allowed it! Having said that, it's very accurate and your house will stay at 22C if you set it there, you wont feel the temperature swing before it kicks in. So it has the sensitivity to detect changes in half/quarter degrees C, you just can't choose it. I guess you can use F for fine tuning, but we're in Canada.
Date published: 2021-03-28
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Is the Sensi Wi Fi thermostat easy to install

Asked by: Bren
Yes, I was able to install this by myself. The app includes step by step instructions with pictures.
Answered by: Sherry
Date published: 2020-02-10

I now know that I don't need the C wire but will the FAN work at FULL SPEED when the air conditioning unit is running?

Asked by: George
I have a bi-energy furnace, oil/electric + seperate A/C. My A/C and furnace for that matter only has ONE speed when heating and cooling (a/c) it is as fast as my previous analog thermostat. Works very well.
Answered by: mikegian
Date published: 2020-01-07

Why are batteries required, why not use the power source. A coin battery type for memory backup would be a better option.

Asked by: K9Bob
Hello K9Bob. Thanks for your question. The Wi-Fi radio needs a strong battery backup. The thermostat uses the common wire as power and if one is installed then the batteries are only back up.
Answered by: Product Expert
Date published: 2021-06-06

Hi I currently have a honeywell thermostat and i believe its for fan, cool and heat. Behind it, it has 3 wires red, white and black connected to the R, W and G respectively; i can also see a silver wire running from the R to the RC. Wil dis product wrk?

Asked by: ASAP reply needed
Call Sensi tech support for the answer. They are very helpful
Answered by: wildappler
Date published: 2018-12-10

I'm considering purchasing the Sensi. Please let me know if the Geofencing feature can be turned off and if there are any motion sensor features that turn the display on as you approach. Thanks. Jay S

Asked by: JAY S
Geofencing is a feature in the mobile app, currently displays as "beta" and can be ignored or turned "off". The display is always "on" but to brighten it, at night for instance, one must press a button. One of the advantages of using a smart thermostat, is the ability to adjust it from a "smart" device such as a tablet or phone or use smart schedules. If used this way, you will seldom use the physical thermostat input.
Answered by: mikegian
Date published: 2020-04-28

Do you have to have something like Alexa or Wink or can you monitor the thermostat via a computer that you have left on in your home? Is there software provided or available to support this?

Asked by: Hotrod2
No you don't need Alexa . you can download an app on your phone. From sensi to monitor the thermostat through WiFi . you will need a smart phone or tablet to set it up.
Answered by: King
Date published: 2019-01-05

Does this model have Circulating Fan function, such as a percentage to be selected to indicate how often the fan should run each hour? eg, If I set the Circulating Fan to 50%, the fan will run 30 minutes every hour.

Asked by: slowall
Yes, but I think it works only on the cell phone application. I currently have it set to run 10% of the time when I select it. If you lose contact with the cell phone it will continue regardless.
Answered by: hamadryad
Date published: 2021-06-15

I don't see option to see usage report at the bottom right corner of my thermostat. Not sure if this option has been discontinued. I bought the Thermostat primarily for this reason so that I could analyze and optimize the usage.

Asked by: VGGD
We get an occasional usage report on our phone
Answered by: Kend
Date published: 2021-02-09
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