--- product_id: 43173735 title: "Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55" brand: "sensi" price: "€ 154.27" currency: EUR in_stock: true reviews_count: 8 category: "Sensi" url: https://www.desertcart.hr/products/43173735-emerson-sensi-wi-fi-smart-thermostat-for-smart-home-diy store_origin: HR region: Croatia --- # 5" LED Display Wi-Fi Connectivity Data Privacy Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55 **Brand:** sensi **Price:** € 154.27 **Availability:** ✅ In Stock ## Summary > 🌍 Smart Living Made Simple! ## Quick Answers - **What is this?** Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55 by sensi - **How much does it cost?** € 154.27 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/43173735-emerson-sensi-wi-fi-smart-thermostat-for-smart-home-diy) ## 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 - • **Sleek Design:** Fits perfectly in your existing thermostat space. - • **Seamless Integration:** Compatible with Alexa and other smart home systems. - • **Effortless Installation:** DIY-friendly with step-by-step app guidance. - • **Energy Savings Champion:** Save up to 23% on HVAC energy costs. - • **Smart Maintenance Alerts:** Receive timely reminders for optimal HVAC performance. ## Overview The Sensi Smart Thermostat combines 100 years of expertise with cutting-edge technology to offer a user-friendly, energy-efficient solution for modern homes. With easy DIY installation, robust data privacy, and compatibility with popular smart home systems, it’s designed to enhance your living experience while saving you money. ## Description DIY your smart home with the Sensi smart thermostat. Compatible with most residential HVAC systems — no common wire (c-wire) required in most applications. You can trust Sensi as we do not sell your personal information to third parties. And Sensi comes with the dependable performance and reliability you can count on from our 100 years of HVAC experience. With our top-rated mobile app and easy installation process, customers of all comfort levels can make the switch to a Sensi smart thermostat. For more information on Compatibility, Energy Savings, and Privacy Protection, please refer to the “Product Documentation” section below. Review: Easy to use app - Works great as they both gave me unable to connect early in but nothing again and I live the easy usage and reporting it gives you too. Easy to mount and connect with a c wire or just a battery too. Review: Step by step app is AWESOME!!!!! Install app BEFORE removing old thermostat. - 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. ## Features - PRIVACY PROTECTION*: Sensi won’t sell your personal information to third parties - 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 - 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 - 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 - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01NB1OB0I | | Additional Features | Data Privacy, Easy DIY Install, Energy Savings, Filter Indicator, Programmable | | Backlight | Yes | | Best Sellers Rank | #1,147 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Home Programmable Thermostats | | Brand | Sensi | | Brand Name | Sensi | | Color | White | | Connectivity Protocol | Wi-Fi | | Connectivity Technology | Wi-Fi | | Control Method | Voice | | Control Type | Button Control | | Controller Type | Amazon Alexa, Google Assistant, SmartThings, Vera | | Customer Reviews | 4.4 out of 5 stars 22,728 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 | | Item Weight | 0.85 Pounds | | Manufacturer | Copeland | | Manufacturer Part Number | ST55 | | Manufacturer Warranty Description | 3 years. | | Material Type | Plastic | | Model Name | Wi-Fi Thermostat for Smart Home, DIY Version | | Model Number | ST55 | | Mounting Type | Wall Mount | | Number of Batteries | 2 AA batteries required. (included) | | 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 | | Smart Home Compatibility | Smart Home Compatible | | 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 | 1.0 Count | | Voltage | 24 Volts (AC) | ## Product Details - **Brand:** Emerson - **Controller Type:** Amazon Alexa, Google Assistant, SmartThings, Vera - **Model Name:** Wi-Fi Thermostat for Smart Home, DIY Version - **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 ![Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55 - Image 1](https://m.media-amazon.com/images/I/61Rl-IZR--L.jpg) ![Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55 - Image 2](https://m.media-amazon.com/images/I/61eYIzj13TL.jpg) ![Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55 - Image 3](https://m.media-amazon.com/images/I/61VwfOjqYjL.jpg) ![Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55 - Image 4](https://m.media-amazon.com/images/I/512MPfJJUJL.jpg) ![Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified, ST55 - Image 5](https://m.media-amazon.com/images/I/71oW2hSiPiL.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 to use app *by J***F on May 15, 2026* Works great as they both gave me unable to connect early in but nothing again and I live the easy usage and reporting it gives you too. Easy to mount and connect with a c wire or just a battery too. ### ⭐⭐⭐⭐⭐ 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. ### ⭐⭐⭐⭐⭐ Works great and priced right! *by T***N on May 19, 2026* This unit was easy to install and easy to set up. The only issue was that I ended up having to call their tech support and we had to do a "reset" to the unit to get it to find my WiFi so I thought that the installation instructions should have had a contingency for that but it was easily corrected and their tech support is available 24/7 so they even answered on a Saturday evening!! The App GUI is a bit cumbersome and could be a little more user friendly but once you figure it out it works well enough. Overall, I'm happy with the unit and I would definitely recommend it!! ## 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) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/43173735-emerson-sensi-wi-fi-smart-thermostat-for-smart-home-diy](https://www.desertcart.hr/products/43173735-emerson-sensi-wi-fi-smart-thermostat-for-smart-home-diy) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-06*