Sensi Lite Smart Thermostat, WiFi, Alexa, DIY, Energy Star Certified, ST25

I am impressed. First of all, watch the installation video in the item listing in Amazon. It is the first video for this Sensi Lite Smart Thermostat and it could not be anymore thorough than it is. If you want step by step it is that and logical. Then the app itself does the same thing, step by step as well. These folks actually cover all the bases. I know a lot about a lot of this but not AC and heating. It went off without a hitch, I have an old 4 wire system with no C wire and what is really cool is BEFORE YOU EVEN BUY you can d/l the app, go to the step as if you are installing a new one, go where you identify the wires on your old thermostat and it will tell you if it will work for you if you are not sure. I had this thing on, up, and connected to wifi and running in about 10-15 minutes, no issues. The only thing that concerned me was I was reading reviews before buying it and some people complained about it losing connectivity frequently. Only 3 minutes after installing that happened one time, and as I was reading the re-connect instructions it prompts you to, then it reconnected on its own before I could do it. For all I know that could have been my wifi burping, it does sometimes. >>IF<< I have that as a recurring issue I will be returning it because my router has plenty of reach and several devices further from it than this thermostat never lose connection. We shall see. I am just trying to give a full picture, I have no complaints but that was the primary reasonable one I saw in the negative reviews. So far I love the thing, the display is very cool, most of the time I will be bumping it manually walking by and that is a piece of cake. I have old eyes and appreciate the large numbers on the display too. I also like I can adjust it remotely from 4 states over as well. Honestly if you just want a remote app and basic functions with a schedule (I won't use) I don't know about all these others that cost way more why you would buy one of those. It is also nice looking. Oh yeah, it works on Alexa and other voice control things I also do not use. I think you get a lot of bang for the buck on this.

it's a very capable thermostat with all the modern features including geofencing which can optionally setback your thermostat when you are more than 3 mile from the house. It's a very attractive and easy to set up but don't forget to install the batteries even if you use a "C" wire. WiFi won't set up without the included batteries

I have a home that was built in 2006 and I work in a technical field (engineer) so I am familiar with troubleshooting hardware/software problems. Anyway, my problems with this unit started immediately. During installation, one is supposed to note the letter codes that the existing thermostat is connected to so that the new thermostat can be notified (via wifi and on app on your phone) how to program its terminals to match the original thermostat's functionality. Unfortunately, my existing wire connection was not recognized as being valid by the app (even though my home is relatively new, has a C wire and works properly with the original controller). I didn't let the this deter to me as I was sure I could fine a setup that would work through a little trial/error and voltage measurement. I was able to program my thermostat the first time without any issues; however, the setup I entered didn't work (system produced heat when it should have been cold), so I tried to reprogram the thermostat for a 2nd try. When I searched for my wifi network on the app, I was informed that no networks could be found, which was strange since all my other devices (computers, tablets, TVs, etc) had no issues connecting to my wifi. No problem I thought because I was given the option of entering the name of a network manually, which I did. After entering the name I was asked to enter the network's password twice, which is also strange since double entry is typically required for setting up online accounts, but not for connecting to your own wifi. Anyway, I entered the password twice and things seemed to be okay for a short time, but then the app kept informing me that it was losing its connection to the thermostat. I put the thermostat in "setup" mode by pressing the mode button for 4 seconds, but the thermostat would only stay in setup mode for a few seconds, and whenever it popped out of setup mode, the app would lose its connection again. What was really frustrating is that every time I tried to change the setup, I had to enter the network name and the password twice, which is pretty dumb for a "smart" device! I fought the system for about 2 hours and I was finally able to get another setup programmed, but that one didn't work either. At this point I decided I was done fighting the thing and I returned it. Again, I'm a competent technical person and my heat pump is relatively new and in good working condition. If I can't get it working smoothly, I don't think many others will be able to either. Perhaps I just had a lemon, but my advice is to steer clear of this finicky little monster.

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.

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.

I chose this product because reviews indicated that it would work with a 2-wire heating system, despite the instructions that it required a C-wire. The bad news is that the thermostat will control the heater via the "R" and "W" wire posts using a manual temperature setting, but it will not work with the Sensi app, which is the whole point, right? But there is a solution! I bought "UL Certified Thermostat C Wire 24V Transformer, White Adapter Compatible with Honeywell, Nest, Emerson, Ecobee, Wyze Thermostat and Most Doorbells" and lo and behold it works! Just connect one wire from the transformer (24VAC) to the same post as the "R" wire and the other transformer wire to the "C" post. It does not matter which transformer wire that you connect to the "R" and "C" posts - AC remember? Set up with the Sensi app proceeded pretty well with a bit of try-agains. It seemed that after scanning the supplied QR code with the Sensi app and starting the configuration, the thermostat dropped the wifi connection. The second try worked like a charm, however. Its not due to the wifi signal either - I bought two of these thermostats, one upstairs and one downstairs - same exact result. Now for the Sensi app itself. Setting up a schedule was easy and works well. The geofencing isn't as customizable as I would like, because it only adjusts the temperature setting by 4 degrees. I would like a bigger adjustment when I am away, but this is not possible. I would also like to see more usage statistics in the app. The usage display is rather simple and not very informative. I would also like to control the temperature display on the thermostat, such that it turns off at night, but I don't see how this can be accomplished in settings. Oh well, there is always electrical tape!.

I love my WiFi thermostat. It was an easy install and I know nothing about installing. Directions are easy to understand. It has an app I can control it with settings to turn off and on at time you choose. The display is large enough to see. It’s accurate on temperature reading. My Alexa also runs it off voice command.

Great price, intuitive interface, simple setup. I didn’t have a C-wire to connect to but that didn’t matter with this thermostat. Very satisfied with this purchase.

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.

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.

Works great. Love the Wi-Fi connectivity and being able to adjust remotely. Great for referring the temperature when coming home from a trip

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

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.