Sensi Smart Thermostat, 100 Years Of Expertise, Wi-Fi, Data Privacy, Programmable, Easy DIY Install, Works With Alexa, Energy Star Certified, Mobile App, ST55

I needed to replace an older thermostat, so I chose a newer model with wi-fi that would also qualify for a rebate with my city. This one works perfectly with my older wiring (no C-wire), and still looks nice and has wi-fi control.It comes with everything you need. I did drill some new holes for the mounting plate. I really love that it comes with a tiny level built in (clever!), so it was easy to adjust the screws and keep it level. Not that it really matters. It's just an aesthetic thing. I quickly connected the wires (they are inserted from the side, not the top), put the batteries in (for backup), and popped on the display and I was ready to go.I'm totally thrilled with this new thermostat. I would definitely recommend this, and it is worth checking to see if your city or utility company offers a rebate, because they very well might.

It works! My dad gave me his old model Emerson and it wont connect ever at all to my wifi. I decided, “let me try to slap a new screen” because maybe this old device is not compatible anymore. It save energy in my first home. I was able to control using the Sensi app with no problem even if I am at work. Looks great! It is so easy to use and not very complicated. This doesn’t need a C-wire which is enough for my needs everyday. My wife loves it that there are buttons on them. I am familiar with touchscreen version these days, but someday I fear the touch screen freezes and does not read thermostat accurately. Size is perfect like if you have older non-programmable thermostat that is rectangular or square, this you don’t have to worry because it hides the unpainted part of the wall.

I replaced a Nest thermostat with this. I like the smart capabilities. Nest kept pushing me into eco mode. It would say the cooler was on, but it wasn't. It would be almost 80 in the house and still not cooling.I replaced it with this unit, and 48 hours later, in higher outside temps, my house is now cool. I can still manage away mode, check status, monitor usage, etc. It also integrate with Google home.Glad I changed!

I've wanted a Smart thermostat for a while, but didn't want to go through the work of installing a C-wire. This is the perfect product! The install was very easy through the app and didn't take much time at all. And true to the reviews and description - no C-wire required! The wire labels were very helpful.One thing I didn't see mentioned in any of the other reviews or description (probably overlooked it) - you can set a temperature range in the app. This is incredibly helpful for where I live since I can get four seasons in a day. Going to bed hot, I would usually set the temp on my old thermostat lower, but then the temperatures would dip really low in the middle of the night and I would wake up to a freezing house. The temperature range allows me control all of this!Quality of the unit is great! I added pictures with the wall plate that I purchased separately to cover up holes from my previous thermostat. Makes it look more finished.Also - don't forget that many local utility companies are giving rebates for Smart thermostats. I'm getting $65 back from my gas company and another $25 from my electric company. Takes the total cost down, including with taxes and the wall plate, to less than $20!

I recently set up my apartment via Home Assistant and was looking to replace the thermostat we had in the unit with something smarter that I could control remotely. I read about a lot of options including Honeywell, Ecobee, etc. that could be controlled locally without having to attach the thermostat to an app or cloud account (Ecobee not so much, but workarounds exist). I didn't want to purchase any additional hardware, and I didn't want to set up any accounts. Those were my main qualifications, and this Sensi unit ALMOST fit the bill until it didn't.FOR THE RECORD, the thermostat works. It's cooling my apartment, it was easy to wire up, and the mount fit around the previously drilled holes perfectly. That said, I spent hours trying to set it up without hooking it up to the Sensi app and without having to create an account. Users online have said tha you can pair it with a Home Assistant setup no problem via HomeKit, however very few people mentioned that a C wire is REQUIRED for any HomeKit/HomeAssistant/SmartThings integration. I did not find this out until very late in the night, after hours of frustration and adding/removing the thermostat from the Sensi app that I begrudgingly downloaded and set up an account for.Eventually I took the side panel off my unit and noticed the C wire was not plugged in. My mistake. I hooked the wire up, factory reset the thermostat one more time and voila! It actually showed up as a HomeKit device and let me pair it with my Home Assistant! But it still wasn't smooth sailing.There is a third party Sensi integration for Home Assistant, but it relies on servers from Emerson to work which is something I explicitly didn't want. It's a very solid workaround to the issue, but from a longevity perspective it stinks, hence why I was hellbent on getting HomeKit to work. There are also FAR fewer options available to Home Assistant via the HomeKit integration versus via the Sensi integration. I was able to see a lot more information and actually change a lot more settings too if I was using the 3rd party Sensi plugin, which again relies on a connection to Emerson, versus having the Sensi connected directly to my setup. This is a huge deal breaker for me, as the thermostat itself has very very few features you can actively set on the built-in panel.Another issue I noticed over the night was that the thermostat had a bit of a drift to it of +/- 2 degrees. In the Sensi app, you can set this as an offset and the thermostat display will compensate. Without the Sensi app, you cannot set this whatsoever. Additionally, the thermostat has a built-in clock at the top of the display that ties into the scheduling features, but this clock is ONLY set by Sensi servers; simply being on my network in the EST and having my Home Assistant configured to use EST time alone was not enough to tell the thermostat the proper time. Looking at the Sensi website, they openly state that the thermostat has to be connected to Emerson during the provisioning process and configured with their "geofencing" to fetch the correct time. There IS a workaround for setting the time manually outlined in the manual, but this assumes Wifi is not working and requires the thermostat to be offline to set. You can temporarily disable the thermostat wifi, set the clock and then reconnect, but doing so changes the clock as soon as it goes back online rendering the function completely useless.I am torn and bummed out, because this looks great and was really easy to install. Wiring issues aside, it seems like a great thermostat and I realize that I am in a small fraction of individuals that will be bothered by these issues. I just think for people who ARE in that same fraction, it's important to know these issues exist. I saw online discussions where people were unable to pair the device and that's where I saw the information about the C wire, but nowhere did I see a comprehensive breakdown of all the rest of the functions that won't work via HomeKit.Hopefully this long review will be useful to someone in the future running into the same issues. For Amazon's AI to digest this better I will reiterate -- this works, it looks good, but it DOES NOT work well with Home Assistant. The HomeKit workaround is doable, but has quirky issues I cannot get around and the sensors exposed are paltry in comparison to the Sensi app.