---
product_id: 43173735
title: "Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55"
brand: "sensi"
price: "818.27 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Sensi"
url: https://www.desertcart.tn/products/43173735-sensi-smart-thermostat-wi-fi-diy-alexa-energy-star-certified
store_origin: TN
region: Tunisia
---

# Energy Star certified saves ~23% energy Wi-Fi connectivity for remote control Battery-powered with included AA batteries Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55

**Brand:** sensi
**Price:** 818.27 DT
**Availability:** ✅ In Stock

## Summary

> 🌡️ Take control, save energy, and stay smart—comfort just got personal.

## Quick Answers

- **What is this?** Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55 by sensi
- **How much does it cost?** 818.27 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/43173735-sensi-smart-thermostat-wi-fi-diy-alexa-energy-star-certified)

## Best For

- sensi enthusiasts

## Why This Product

- Trusted sensi brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dynamic Scheduling Mastery:** Customize daily or weekly temps with intuitive app controls—perfect for any lifestyle.
- • **Effortless DIY Installation:** Built-in level & app-guided setup means no pro needed—get smart in minutes.
- • **Privacy-First Smart Control:** Your data stays yours—no third-party selling, just secure comfort.
- • **Proactive HVAC Health Monitoring:** Real-time alerts and maintenance reminders keep your system efficient and worry-free.
- • **Seamless Alexa & Smart Home Integration:** Voice control and compatibility with Apple HomeKit, Google Assistant, and more.

## Overview

The Sensi Smart Thermostat ST55 combines easy DIY installation with advanced Wi-Fi connectivity and Energy Star certification to deliver up to 23% HVAC energy savings. Designed with privacy protection, it offers flexible scheduling via a top-rated app and integrates seamlessly with Alexa, Apple HomeKit, and Google Assistant. Its smart maintenance alerts and usage reports empower you to optimize your home's comfort and efficiency effortlessly.

## Description

Sensi smart thermostats are designed for energy savings and data privacy – to give you full control of your home HVAC. With over 100 years of HVAC experience and manufactured by Emerson, you know our expertise already, even if you didn’t realize it. Emerson produces many of the HVAC parts that our smart thermostats control, so you can feel confident in the product you put on your wall. With our top-rated mobile app and easy installation process, customers of all comfort levels can make the switch to a Sensi smart thermostat. In addition, our customer service team of HVAC experts is always available to help you through any questions you might have. *For more information on Compatibility, Energy Savings, and Privacy Protection, please refer to the “Product Documentation” section below.

Review: Easy and accurate - This thermostat was incredibly easy to install and has already saved us a ton in just the first month or so. We purchased a new home in Minnesota but could not be there permanently for the first few months through March and April. In late March I installed this thermostat while at the house. The old dumb thermostat simply was running at a low temp while away which could have put the house at risk for cold weather. First off - Installation was simple. It took me about 10 minutes to install and it connected easily to our Wifi. I was able to set a couple different schedules and able to monitor them from our home in Colorado. I could see actual in home temps. See when the furnace was running and see outside temps forecast in the area. Upon return to our new home, I was able to use schedule which changed temps throughout the day based on our needs. I recommend this to our son and he installed one as well and loves it. A nice bonus was our local electrical company provide a nice rebate. I highly recommend.
Review: Super easy to install and to interface with app!! - This is a must buy!! This was super easy to install!! Note: I think you are supposed to set up the app FIRST and THEN install the device!! But it worked just fine. I think it would have walked you thru the installation if we set up the app before installing the device. We removed the old thermostat’s cover plate then held up this thermostat w/o the cover plate. Then we took a quick pic of the old thermostat’s wiring with this thermostat’s inner panel. We removed the wiring in the order of this thermostat’s wiring diagram, too to bottom and removed the old plate. When we slipped this thermostat over the wires, they were all aligned an in order. Easy peasy to insert each one in order, top to bottom or bottom to top. Press down the wires, pop on the cover plate. Then we had to download the app, Sensi, and go thru the process to create a profile, select the wires inside our thermostat, and then zip thru the set up. So later, we were messing around with the app, setting up the schedules for when to cool/heat and at what temperatures to change and when. The app interface was SO VERY EASY!! It allows you to copy previous schedules or to create new based on existing schedules. It was really intuitive how to schedules and click thru everything. You can set schedules for when you only have heat on. And you can set schedules for when you only have the A/C on. AND you can set other schedules for when you have it on auto and it switches between heat and cool. Additionally, you can set any type of schedule combo for the week. So if you work from home, set a 7 day schedule. If you work M-F, set a 5 day schedule and weekend schedule. If you work 4-10s, easily set one schedule for your work week and a second for your 3-day weekend! Best yet! If you are a fireman or nurse and work a couple days on and a few days off , set up a schedule or two, call one long week and one short week or call it MTFSa/WThSu to show which days you are at work/home. I have never had one where I could schedule each day independently and was so easy to make multiple schedules. I can create one schedule for the days I work/am home, and then create a copy of that and just swap the days that I’m at work/home without having to schedule each and every day all over again. This is the easiest interface EVER!! ( I know my explanation doesn’t do it justice, but it is nice. I’m about to schedule another one for when I work nights. Then I just toggle between them at work if I find out I need to pull a double shift I hate new technology… but this was a dream… even for me!! Sensi, I tip my hat to thee for your user friendly product!! THANK YOU!!

## Features

- PRIVACY PROTECTION*: Sensi won’t sell your personal information to third parties
- EASY DIY INSTALLATION: Use the built-in level and step-by-step app instructions for a quick installation. Works with HVAC equipment found in most homes. Common wire (c-wire) is not required in most applications
- SAVE ABOUT 23% ON HVAC ENERGY*: The ENERGY STAR-certified Sensi smart thermostat can help you save energy with features like flexible scheduling, remote access and usage reports
- SIMPLE CONFIGURATION: Looks and feels like a thermostat. Has buttons and fits the same space as a traditional thermostat so you don’t have to patch and paint your walls
- SMART MAINTENANCE: Sensi can help monitor the performance and efficiency of your HVAC system by delivering valuable usage reports, alerts about your equipment, and maintenance reminders like filter replacement

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01NB1OB0I |
| Additional Features | Data Privacy, Easy DIY Install, Energy Savings, Filter Indicator, Programmable |
| Best Sellers Rank | #2,659 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #12 in Home Programmable Thermostats |
| Brand | Sensi |
| Brand Name | Sensi |
| Color | White |
| Connectivity Protocol | Wi-Fi |
| Connectivity Technology | Wi-Fi |
| Control Method | App, Touch, Voice |
| Control Type | Button Control |
| Controller Type | Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings, Vera |
| Customer Reviews | 4.4 out of 5 stars 23,050 Reviews |
| Display Type | LED |
| Finish Types | Glossy |
| Global Trade Identification Number | 00786710554827 |
| Included Components | Thermostat, free mobile app, 2 AA batteries, mounting hardware, wire stickers, installation guide, welcome guide with Sensi code, warranty booklet |
| Item Dimensions D x W x H | 1"D x 5.88"W x 3.75"H |
| Item Type Name | , Works with Alexa, Energy Star Certified |
| Manufacturer | Copeland |
| Manufacturer Part Number | ST55 |
| Manufacturer Warranty Description | 3 years. |
| Material Type | Plastic |
| Model Name | ST55 |
| Model Number | ST55 |
| Mounting Type | Wall Mount |
| Number of Batteries | 2 AA batteries required. (included) |
| Number of Items | 1 |
| Power Source | Corded Electric |
| Product Dimensions | 1"D x 5.88"W x 3.75"H |
| Product Style | DIY |
| Screen Size | 5 inches |
| Shape | Rectangular |
| Special Feature | Data Privacy, Easy DIY Install, Energy Savings, Filter Indicator, Programmable |
| Specific Uses For Product | Air Conditioner, Boiler, Furnace, Heat Pump |
| Temperature Control Type | Programmable, Smart/Remote |
| UPC | 786710554827 |
| Unit Count | 1 Count |
| Voltage | 24 volts_of_alternating_current |

## Product Details

- **Brand:** Sensi
- **Controller Type:** Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings, Vera
- **Model Name:** ST55
- **Product Dimensions:** 1"D x 5.88"W x 3.75"H
- **Special Feature:** Data Privacy, Easy DIY Install, Energy Savings, Filter Indicator, Programmable

## Images

![Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55 - Image 1](https://m.media-amazon.com/images/I/61L1yh4m7VL.jpg)

## Available Options

This product comes in different **Pattern, Style** options.

## Questions & Answers

**Q: Can you create a fan schedule?  I’d like the fan to always run from 10pm until 6am.**
A: Updated Answer:
THANK YOU to Albert who pointed out below that the fan can be controlled through SmartThings! It was annoying to have to set up another app and service to do this, but it is a workaround to get around Sensi's frustrating limitation. SmartThings allows you to set the fan to Auto, On, or Circulate (but not the percentage of time to circulate) and automate that on any schedule you want. Unfortunately, Alexa and Google still don't allow you to control the fan at all, even though Sensi's API apparently allows it.

Original Answer from June 6, 2020:
No, you can't do a schedule like if you want it to run all the time during the night. Also, you can't control the fan from Alexa to schedule it that way. Very annoying and unreasonable that they wouldn't add that option since you can turn it on manually from the app. They do have the auto-circulate feature, but that's not the same.

**Q: Is it smart enough to decide whether to run the heater or cooler to keep the temperature fixed?**
A: In spite of the snarky answer above that says that's what a thermostat does, it should be noted that a thermostat doesn't just so that unless it is a feature of the thermostat.

A thermostat is for comparing existing ambient temperature to programmed temperature. On a furnace, if the temperature exceeds the programmed temp, the furnace simply will not run. THAT is what a thermostat does. UNLESS there is the ability to set said thermostat to automatically adjust the temp to the programmed temp.

**Q: Can you program just the fan mode?**
A: As pointed out on a similar question, the Sensi app does not allow scheduling of the fan mode, but you can do it with a 3rd party integration to the SmartThings app. Unfortunately, Alexa and Google don't have the option to control the fan either, but the SmartThings workaround was good enough for me to set our fan to run automatically at night and turn off in the morning.

**Q: What if i have a C wire?**
A: The "C-wire" is the second wire for 24VAC which is used to power advanced thermostats. Older thermostats were just a mercury switch and didn't have a need for additional power supply. Most newer systems are using 5-conductor thermostat wire.. Think of it as the plus side of a DC circuit/battery (but it is AC[thermostats have a rectifier to convert the AC to DC for their use]). Use it and the "common-wire" to supply 24VAC to the thermostat and zone valves/zone dampers. Without it, the thermostat runs on battery all the time and will quickly run down with WiFi.  Add a zone controller like a Honeywell HZ311 which has full modern voltages output; i.e., c-wire with 24VAC. This control requires a 24VAC transformer and daisy chains the 24VAC to thermostats and works on older systems since it provides its own c-wire output to advanced thermostats.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy and accurate
*by D***K on May 14, 2026*

This thermostat was incredibly easy to install and has already saved us a ton in just the first month or so. We purchased a new home in Minnesota but could not be there permanently for the first few months through March and April. In late March I installed this thermostat while at the house. The old dumb thermostat simply was running at a low temp while away which could have put the house at risk for cold weather. First off - Installation was simple. It took me about 10 minutes to install and it connected easily to our Wifi. I was able to set a couple different schedules and able to monitor them from our home in Colorado. I could see actual in home temps. See when the furnace was running and see outside temps forecast in the area. Upon return to our new home, I was able to use schedule which changed temps throughout the day based on our needs. I recommend this to our son and he installed one as well and loves it. A nice bonus was our local electrical company provide a nice rebate. I highly recommend.

### ⭐⭐⭐⭐⭐ Super easy to install and to interface with app!!
*by L***O on July 10, 2023*

This is a must buy!! This was super easy to install!! Note: I think you are supposed to set up the app FIRST and THEN install the device!! But it worked just fine. I think it would have walked you thru the installation if we set up the app before installing the device. We removed the old thermostat’s cover plate then held up this thermostat w/o the cover plate. Then we took a quick pic of the old thermostat’s wiring with this thermostat’s inner panel. We removed the wiring in the order of this thermostat’s wiring diagram, too to bottom and removed the old plate. When we slipped this thermostat over the wires, they were all aligned an in order. Easy peasy to insert each one in order, top to bottom or bottom to top. Press down the wires, pop on the cover plate. Then we had to download the app, Sensi, and go thru the process to create a profile, select the wires inside our thermostat, and then zip thru the set up. So later, we were messing around with the app, setting up the schedules for when to cool/heat and at what temperatures to change and when. The app interface was SO VERY EASY!! It allows you to copy previous schedules or to create new based on existing schedules. It was really intuitive how to schedules and click thru everything. You can set schedules for when you only have heat on. And you can set schedules for when you only have the A/C on. AND you can set other schedules for when you have it on auto and it switches between heat and cool. Additionally, you can set any type of schedule combo for the week. So if you work from home, set a 7 day schedule. If you work M-F, set a 5 day schedule and weekend schedule. If you work 4-10s, easily set one schedule for your work week and a second for your 3-day weekend! Best yet! If you are a fireman or nurse and work a couple days on and a few days off , set up a schedule or two, call one long week and one short week or call it MTFSa/WThSu to show which days you are at work/home. I have never had one where I could schedule each day independently and was so easy to make multiple schedules. I can create one schedule for the days I work/am home, and then create a copy of that and just swap the days that I’m at work/home without having to schedule each and every day all over again. This is the easiest interface EVER!! ( I know my explanation doesn’t do it justice, but it is nice. I’m about to schedule another one for when I work nights. Then I just toggle between them at work if I find out I need to pull a double shift I hate new technology… but this was a dream… even for me!! Sensi, I tip my hat to thee for your user friendly product!! THANK YOU!!

### ⭐⭐⭐⭐⭐ Step by step app is AWESOME!!!!! Install app BEFORE removing old thermostat.
*by B***I on July 18, 2020*

We've had this thermostat a month and I really like it so far. It makes me think our old thermostat wasn't actually working for a long time before it started setting itself to 85°. Since it wasn't even programmable, I knew it had to go and if I was going to upgrade I may as well go with something just a bit more...modern than a set-temp-and-it-stays-unless-you-change-it thermostat. I'm going to do pros and cons below. I do want to say, I took my old thermostat off the wall first, wrote down all the wire colors and the letter each was connected to on a piece of paper. The app removes the need for pen and paper. I just used my pen and paper to place the flags mentioned below on the correct wires. Pros: 1. This thing is super easy to install. Open the box and there are instructions for you to download the Sensi app. Once the app is downloaded it has you choose which letter slots you have wires connected to (R, RH, C, E, OB, etc.). The app then tells you how to use the flags they provide to label the wires. For example I had a wire that went into a slot labeled "R", but Sensi only had "RH" and "RC" (I think it was RC), so the app told me which R my wire needed to go in. Not having any electrical wiring experience, the app was SUPER helpful. It even had you take a picture of your wiring to save to your phone, just in case. 2. The piece that attaches to the wall has a built in level. I am super annoyed when things aren't straight on walls, so this right here, was awesome. 3. The app is really easy to set up. I just have a daytime and nighttime cycle, but I could set up all kinds of things super easily. Vacation modes, turning the AC up when I leave the house... It was great. It even walked me through how to sync the app with my Google assistant and the Samsung Smart Things app, which I didn't end up continuing to use. (See cons #1) 4. The report that tells you how long your AC is running is really helpful as well, especially since we had issues last year with it not being able to keep up. We have better insulation and updated windows and it's nice to see they are working, even when it's 99° with a heat index at 112°. (See cons #2) 5. I like that you can do things like temp and humidity offsets, have the AC turn on to help maintain proper humidity levels (we live in Florida, so this is a big thing for me), change the cycle rate (ended up choosing this one over another brand because people had issues with not being able to adjust the cycle rate on that one), and easily turn heat boost on or off. (See cons #3) Cons: 1. It doesn't work with Bixby. This is something I don't really understand, but I'm guessing they assume if you're gonna use Bixby you use Smart Things? But I can just use Google for that instead. 2. The recent usage section only shows how long the AC ran that day, not which times it ran or how long at a time it ran. It would be nice to see how long the AC was running at a time, especially in the afternoon when it gets really hot. I have not yet gotten a monthly report since I got the thermostat mid-June and it's now mid-July. Interested to see what the monthly report looks like at the end of the month. 3. Sometimes I had to change settings a couple times before they "stuck". I found after changing a setting I needed to wait a few seconds before returning to the settings menu and that helped. 4. Shortly after I got the thermostat the AC drain line clogged. This resulted in my app/thermostat constantly saying cooling was on, but the AC wasn't running. My usage for that day was like 21hrs, but I know it wasn't actually on for the majority of that. Not really a huge issue, but you won't have an accurate reading for that day. Summary: Overall, this is a really amazing unit and I have been really glad to have it. It was seriously a breeze to instakl and set up and functions well. I do wish I could connect it to Bixby without using Smart Things and I do wish I had a more detailed daily usage report, but those are very small inconveniences. I normally keep our house at 78° during the day and 77° at night and sometimes that feels cold. I would often feel hot before and wondered if our AC was not working correctly, but it would seem it was actually the thermostat. Very happy with this purchase.

## Frequently Bought Together

- Sensi Smart Thermostat, 100 Years Of Expertise, Wi-Fi, Data Privacy, Programmable, Easy DIY Install, Works With Alexa, Energy Star Certified, Mobile App, ST55
- Emerson F61-2663 Wall Plate for Sensi Wi-Fi Programmable Thermostat, White
- CAMGJORT F61-2663 Wall Plate for Sen si Wi-Fi Programmable Thermostat,Hand Control, White (1)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-09-18*