- 7% Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson

Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson

(1622 customer reviews)

Original price was: $69.99.Current price is: $64.94.

Original price was: $69.99.Current price is: $64.94.

Customer Favorite — discover the Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson, built for performance and designed for life in the United States.

About Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool…

  • EASY DIY INSTALLATION: Do it yourself fast with a built-in level and simple step-by-step instructions. Works with the HVAC equipment found in most homes
  • COMMON WIRE REQUIREMENTS: Common wire(C-Wire) required for heat pump and heat/cool only systems. C-wire not required on most systems
  • SAVE ABOUT 23% ON HVAC ENERGY*: ENERGY STAR-certified and packed with features that help you save money, including flexible scheduling, geofencing, remote access and usage reports
  • PRIVACY PROTECTION*: Sensi won’t sell your personal information to third parties or leverage your thermostat activity data for targeting or advertising purposes
  • CONTROL FROM ANYWHERE: The top-rated mobile app for Android and iOS devices makes it easy to control your comfort from a smartphone or tablet

The Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson combines reliability, modern design, and user-focused engineering. Perfect for everyday use, it delivers exceptional results for American customers who value comfort.

Specification: Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson

Brand

‎Emerson

Model Name

‎Sensi Lite

Product Dimensions

‎0.88"D x 5.07"W x 3.13"H

Controller Type

‎Amazon Alexa, Google Assistant, Hand Control, SmartThings

Special Feature

‎Auto Changeover, Daylight Savings Time Ready, Filter Indicator, Low Voltage, Programmable

Color

Black

Specific Uses For Product

‎Air Conditioner, Boiler, Furnace, Heat Pump

Temperature Control Type

‎Automatic or Programmable

Connectivity Technology

‎Wi-Fi

Included Components

‎(2) AAA Batteries, Installation Guide, Mounting Hardware, Sensi Lite Smart Thermostat, Wire Labels

Power Source

‎Battery or C-wire

Item Weight

‎4.8 ounces

Voltage

‎24 Volts

Shape

‎Rectangular

Display Type

‎LCD

Control Type

‎App Control

Control Method

‎App

Connectivity Protocol

‎Wi-Fi

Mounting Type

‎Wall Mount

Style

‎Simple

Backlight

‎Yes

Specification Met

‎Energy Star

Number of Batteries

‎2 AAA batteries required. (included)

UPC

‎786710568732

Manufacturer

‎Emerson

Part Number

‎ST25

Item model number

‎ST25

Batteries

‎2 AAA batteries required. (included)

Size

‎0.88 x 5.07 x 3.13

Pattern

‎Thermostat

Item Package Quantity

‎1

Special Features

‎Auto Changeover, Daylight Savings Time Ready, Filter Indicator, Low Voltage, Programmable

Batteries Included

‎Yes

Batteries Required

‎Yes

Battery Cell Type

‎Alkaline

Warranty Description

‎3 years.

Date First Available

March 27, 2023

Photos: Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson

1622 reviews for Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson

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  1. Lee G

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    Absolutely love this thermostat. Simple yet saves you money. Love being able to use the app to control it and see my power usage. After about a week you can setup a schedule. Unlike the models where you have to set it up at the unit, no in this case. You use the app and it’s very simple. LED display is bright and always on. Easy to read from across the room. I use the app mostly. Installation took me about 10 minutes. Very easy and straightforward. I have a gas forced air furnace and AC unit outside. It controls them easily and without a C wire. I’ve installed the app in 4 phones and they have zero issues controlling the unit. The mounting plate has a built in level so mounting it level is a breeze. Hooked it up to my Alexa show and it works perfectly with it. Another thing I like is it shows the humidity level of the inside of your home. Nice feature to have. All and all I am very happy with the thermostat and its features. As winter approaches I can setup a schedule far easier than standing at a unit punching in times and days. The app makes this very streamlined. It also looks very nice on the wall.

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  2. Randy Stanard

    This thermostat is very uncomplicated, but does everything a person should want out of a smart thermostat.

    You can pay hundreds for other smart thermostats but none will heat/cool you home better than this Sensi Lite.

    The app interface is clean and easy to understand. You can set multiple heat/cool scenarios and activate whichever one needed at the tiime.
    One feature that I like in particular is the “Early Start” that will start heat/cool early to achieve your target temperature at the specified time.

    For many people who do not have the C-Wire, this thermostat will work perfectly without it. No need to worry yourself and suffer sleepless nights over C-Wire. With or WITHOUT C-Wire this thermostat will do the job for you. Enjoy your sleep with no C-wire nightmares.

    I have owned other smart thermostats and some (more expensive than this) have had unreliable connections to wifi. They would be offline as often as ONLIINE. This is very annoying when you want to check the temperature or wish to change settings when you’re away from home.

    The Sensi Lite has been ROCK SOLID in its’ online connection. In the months since installation, I have never, even ONCE, observed it being Offline.

    I have recommended this to other family members.

    If you want to keep your home heated or cooled to a specific range of temperature and don’t want to worry if you will freeze or boil in your home due to a rogue thermostat, then the Sensi Lite is for you.

    Check around and you will find almost all other smart thermosts to be MUCH more expensive than the Sensi.
    This is reasonably priced and will do a great job for you.

    UPDATE: After 2 months of use, the touch sceen on the thermostat croaked, so I was only able to adjust temperature in the app. I purchased this a “Used: Like New”, but as you may know you’re out of luck after 30 days. Fortunately, Amazon gave me a grace period and agreed to refund. But, don’t count on a refund past 30 days.
    I repurchased this SAME thermosat, but NEW this time an added a 36 month warrnty, to be safe.

    I am still sold on this thermosat, but anything can malfunction, so I don’t believe I’d buy this thermostat as refurbished. I would buy this NEW.

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  3. Amazon Customer

    Great thermostat but make sure you have the right hook ups and wiring on your old furnace before removing your old thermostat or you will be in for a headache, basically do your research before tearing things apart and watch plenty of videos. Thermostat works great once it was hooked up and being able to control from your phone is a blessing.

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  4. Lora Wylie

    This shouldn’t be sold globally. You can’t use it as a smart device outside Canada and the US.

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  5. Jim Z.

    This was purchased for a church building where areas are unoccupied at various times. This first purchase was a trial. The heating system is hot water with a central boiler serving several zones.
    We found this thermostat much easier to install and program than a previous brand we had we had tried to use. It connected easily with our existing Wi-Fi. For our system (heat only) it required a “C” wire but fortunately the existing wiring contained a wire we could repurpose. We haven’t used the early start feature yet we’ve just estimated the time to achieve the set temperature and programmed the system to come on soon enough to achieve it. A conversation we had with the the help line informed us that the thermostat will learn the time needed to achieve the correct temperature.
    The one call to the help line was very useful. The wait to be connected was fairly long, 15 minutes or so, but the gentleman was very knowledgeable and able to answer all the questions we asked. We have also emailed a question and received an answer but the response is slow.
    We’re pleased with the appearance of the unit it looks very solid and it’s not obtrusive and it is also easy to read. We also like the fact it can be locked to prevent unauthorized adjustment.
    It has been convenient and easy to install the app on multiple phones and nice to be able to check and adjust programs remotely. It is also nice that it connects to some weather information and displays the outside temperature.
    It’s great to have the room at a comfortable temperature when you expect it to be.
    We will also connect the a/c system to it later which now runs on a separate device.
    We have been pleased with the unit and have ordered two more for other areas.

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  6. Security man

    Amazing product. I now can control temps from anywhere

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  7. Colin Kestell

    I had tried 2 different units of the same model and they both exhibited the same issues. The problem was a loss of wi fi signal and the system was going into off mode. Tried calling the help desk but was but on hold hearing the same message for 20 minutes. There was no message stating that there was a back log of customers. Appearance and simplicity I give it 5 stars but automated functionality I have to fail it.

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  8. Amazon Customer

    I managed to get this working with my old brivis gas heating unit. This thermostat need C wire for gas heating.
    Old thermostat had only two wires. But the heater unit had C wire built-in which I rewired to connect to this thermostat to make it work.
    Setup is very straightforward. It’s being one month since I installed and working perfectly.
    Happy with thr product so far.
    Note that this is a US product and it has US units and location/ weather information is only related to US or Canada.
    But I use Alexa and Google Home to align with my location in AU.

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    Last updated on October 19, 2025 5:13 am Details
    Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson
    Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool… by Emerson

    Original price was: $69.99.Current price is: $64.94.

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