#1 Home Improvement Retailer

Internet # 325327136

Model # ST25

Store SKU # 1009608468

Sensi Lite Wi-Fi 7-Day Programmable Thermostat, Touchscreen Display, Data Privacy, C-Wire Not Required

Limit 5 per order
$79.99
$89.99
Save $10.00 (11%)
Apply Now
Pay $54.99 after $25 OFF your total qualifying purchase upon opening a new card. 
Apply for a Home Depot Consumer Card
  • Energy Star certified - save up to 23% on your HVAC energy
  • Privacy protection – we don’t sell your data to third parties
  • Easy DIY installation – with step-by-step instructions
  • View More Details

Free & Easy Returns In Store

Return this item within 90 days of purchase.

Read Return Policy

Ask about this product

Get an answer now with AI

Magic Apron Assistant is an AI virtual assistant. By proceeding, you consent to the recording and use of your information by The Home Depot (and authorized third parties). More information

Product Details

About This Product

Give your family's comfort a smart upgrade. With the Sensi Lite smart thermostat, it's never been easier. It all starts with a quick and simple installation(2.4GHz WiFi connection)-no common wire required with most systems1. Our top-rated mobile app lets you manage your home's HVAC from anywhere, anytime. Plus, your usage activity and personal data stays private. That's the power of putting Sensi's over 100 years of HVAC experience on your wall.

Highlights

  • 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. No common wire (c-wire) required on most systems (only required on heat only and cool only systems)
  • SAVE ABOUT 23% ON HVAC ENERGY2: 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
  • SMART MAINTENANCE: Sensi can help monitor the performance and efficiency of your HVAC system by delivering usage reports, alerts about your equipment, and maintenance reminders like filter replacement
  • RELIABILITY: Includes a best-in-class 3-year manufacturer warranty
  • PROVEN PERFORMANCE: Over 100 years of experience and excellence in HVAC
  • Click here for more information on Electronic Recycling Programs
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 325327136

Model # ST25

Store SKU # 1009608468

Specifications

Dimensions

Product Depth (in.)

.88 in

Product Height (in.)

3.13 in

Details

Color Family

Black

Color/Finish

Black

Control Type

Manual, Phone Controlled, Voice Controlled

Features

Auto Changeover, Backlit Display, Battery Back-Up, Built-in Wi-Fi, Daylight Savings Time Ready, Filter Indicator, Low Battery Indicator

Heating & Cooling System Type

2 Stage

Included

Batteries, Display Base, Mounting Hardware

Pack Size

1

Power Options

Battery, Hardwired

Power Options

Hardwired

Remote Access

No Remote Access

Requires Hub?

No Hub Required

Returnable

90-Day

Smart Home

Smart Home Enabled

Smart Home Protocol

Wi-Fi

Thermostat Compatibility

Universal

Thermostat Shape

Rectangular

Thermostat Type

Heating and Cooling

Voice Control Hub Required

No Hub Required for Voice Control

Voltage (V)

24 V

Voltage Type

Low Voltage

Wire Configuration

3-Wire

Works With

Alexa, Google, Google Assistant, Samsung SmartThings

Warranty / Certifications

Certifications and Listings

Energy Star, Title 24

Manufacturer Warranty

3 Year Limited

Questions & Answers

I have a 2-wire connection. There's a W1 (white cable) and an RH (red cable). There are no other cables available. Will the Sensi Lite thermostat work with this configuration? Thank you
ByOct 14, 2026
1 Answer | 
Answer This Question

Hi Jim! Your thermostat is installed to a heat-only, the Sensi does require a "C" wire in order to maintain Wi-Fi connectivity, without the "C" wire, the Wi-Fi radio will be turned off in order to preserve battery life. You can learn more about compatibility and "C" wire options on our website: https://sensi.copeland.com/en-us/support/compatibility. Thank you and have a great day!

By|Oct 15, 2026


    Can this be used with forced hot water system?
    BySep 13, 2026
    2 Answers | 
    Answer This Question

    Sensi is typically compatible with a forced hot water/boiler system, but we recommend reviewing our compatibility checker to ensure if our thermostat will work with your system. The checker can be found on our website: https://sensi.copeland.com/en-us/support/compatibility. Thank you and have a great day.

    By|Oct 15, 2026

      This thermostat is compatible with boiler heating ????

      By|Sep 17, 2026


        can i used for a heat pump?
        BySep 8, 2026
        1 Answer | 
        Answer This Question

        Hi Misael, Sensi is compatible with a heat pump but it does require a "C" wire. You should check your wiring against our compatibility check to ensure that you have the correct wiring. The checker can be found on our website: https://sensi.copeland.com/en-us/support/compatibility. Thank you and have a great day.

        By|Oct 15, 2026


          Can this be used for a gas fireplace
          ByAug 5, 2026
          1 Answer | 
          Answer This Question

          Hi Gerri, we do not recommend the Sensi Lite for a gas fireplace set up. You can double check your system and wiring by visiting our website: https://webapps.copeland.com/resources/wire-picker.aspx. If you have any additional questions please reach out to support@sensicomfort.com. Thank you and have a great day.

          By|Sep 22, 2026


            Can this thermostat be set for ac only or heat only? Or does it only switch btwn the ac/heat based on temp settings? I do not want it to switch ac to heat automatically. Or vice versa
            ByJul 1, 2026
            0 Answer | 
            Answer This Question

            Can I set a code on this so nobody else changes the settings? Or its any other thermostat that I be able to do it ?
            ByMay 18, 2026
            0 Answer | 
            Answer This Question

            I RAN OUT OF THE BATTERIES AND THE THERMOSTAT STOP WORKING. THEY NEEDED ALWAYS THE BATTERIES CHARGED?
            ByMay 16, 2026
            0 Answer | 
            Answer This Question

            Can I limit the manual adjustment range. Like limit the the range that a tenant can set it to between 68 and 74?
            ByFeb 26, 2026
            0 Answer | 
            Answer This Question

            Viewing 1-8 of 63

            Customer Reviews

            4.1 out of 5

            • 4.1 out of 248 reviews
            • 80% recommend this product
            Filter by:
            Showing 1-10 of 248 reviews
            Easy installation
            I just bought this the other day. I have installed it and everything works great. Only had one hiccup when connecting to WiFi. Just retried and connected right away. Being able to change my temps from my phone and set schedules is a great feature to have. I’m pretty happy with it so far.
            by
              1 found this review helpful
              Almost ruined furnace
              Made the motor of my furnace make a jumping noise clank clank, after buying this and using for months. Was the thermostat that was bad, new one doesn't cause issue. Buyer beware.
              by
                1 found this review helpful
                Unreliable -1st one lasted 13 mo. 2nd lasted 6 weeks.
                I bought the Sensi Lite thermostat in May 2024. It stopped responding (showing only a white screen) in June 2025. I bought another Sensi Lite. It worked great for 6 weeks and then the same issue happened. I replaced it with a basic Honeywell round thermostat
                by
                Response from Emerson ThermostatsAug 12, 2025
                Thank you for your review of our Sensi Lite Thermostat. If you haven't already, please reach out to our Sensi Support Team at support@sensicomfort.com. They can assist with troubleshooting your issue and processing a replacement if you qualify for one. Thank you again and have a great day. EmersonResidentialRetail
                  1 found this review helpful
                  Easy Setup!!
                  Easy setup and installation! I had a Major Brand for several years prior to 2020 and enjoyed it. But, then when I had to replace my condenser, and noticed a strange noise coming from outside. I contacted my HVAC Technician and found out the Major Brand was running my condenser fan in reverse, evidently a glitch in the thermostat. I didn't have that problem before, so the Technician replaced it with non smart thermostat. I had that since 2020 until I decided that I liked switching temps from my smartphone, so decided to take chance with this Sensi Thermostat. After numerous times running outside and checking my condenser fan, it was exhausting hot air vertically out of the unit, so don't have that issue anymore. It stays connected to WI-FI well and I have a 2.4 GZ & 5.0 GZ router, so no issues at all after 3 days! I may end up purchasing the Sensi Touch 2 if all goes well with is one. So far, GREAT!!
                  by
                    • Recommended
                    Easy to install and works great
                    Very easy to setup. My central air doesn't have a C-wire. After my Google Nest thermostat did not work, I bought this. I mounted on wall and completed Wi-Fi and App setup in 10 mins. Cooling, fan and Heating started working right away. Very happy with the purchase.
                    by
                      • Recommended
                      This have all the features I'm looking for. Large numbers, Download App to my phone, Alexa, programmable & looks good on my wall. Had it 3 weeks.
                      by
                      • Verified Purchase
                      Had installed a nest but wasnt compatible worked great bright screen and easy to link 2 ur phone
                      by
                      • Verified Purchase
                      We had to get a separate plate for the wall to cover up wire hole as this unit was small. Once my husband set it up, I had difficulty connecting to the wifi. It kept disconnecting. However, once that was set up, programming the schedule on the app was fairly easy.
                      by
                      • Verified Purchase
                      Looks great and easy-to-use
                      Bought a month ago and it was a great upgrade for me
                      by
                        • Recommended
                        Wifi is trash
                        You must have a router that has specific 2.4ghz band. You cannot have a mixed 5g & 2.4. Had to return it. Tech support took about 30 mins to answer, they seemed lost.
                        by
                        Response from Emerson ThermostatsJan 3, 2024
                        Thank you for taking the time to review the Sensi Lite smart thermostat. We are sorry you experienced issues with router compatibility. We try to be clear in our product documentation and packaging that Sensi Lite requires a 2.4GHz network to connect to Wi-Fi and we apologize for the confusion. If you'd ever like to give Sensi another try, most routers can have multiple networks that can be established from your router setting. Thank you again for your time! EmersonResidentialRetail
                          4 found this review helpful
                          Showing 1-10 of 248 reviews

                          Compare Key Features

                          current item

                          Product Snapshot

                          Great for homeowners looking for data privacy, making climate control easier and more efficient.
                          Great for homeowners looking for programmable thermostats, making temperature control easier.
                          Ideal for homeowners looking for flexible programming, making temperature control easier. The Honeywell Home T5 thermostat offers simple installation and an extra-large backlit display for easy configuration.
                          Great for homeowners looking for energy savings, making climate control easier and more efficient with smart features.

                          Voice Control

                          Geofencing

                          Smartphone App Control

                          Learning Capability

                          Energy-Saving Features