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'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've purchased the Sensi Smart Thermostat to replace an old Honeywell, simple display, no features, no wifi. The Sensi smart does a good job in terms of resources, wifi, and parameters to better control the AC. The app Sensi gave a direction to install but I had four wires and they suggested only three. I called the Sensi support line, and they gave me the solution to attach the 4th wire on connector Y. It worked immediately and I was able then to set up wifi and other parameters for the AC. The support was great and very straight forward, 10. This is a great differential on buying, havin a great support.

We had an old programmable thermostat that was a big pain, and not so flexible. I didn't want to put in one that looked complicated, however. Some of the Sensi models look like a phone on the wall. This one resembles the old thermostat.This one was easy to install, and (once I learned how to accommodate an unusual situation by calling support) activated and is working well. I think we are all quite satisfied.The best part is the app -- it allows multiple daily programs, and has the level of control we needed. Plus it seems to be quite accurate in its humidity measurements, and I think it helps keep the air fresh circulating for a few minutes every hour.

Bought this thermostat because I wanted to more closely monitor my HVAC system's energy usage through an APP, had no idea that it would significantly cut my energy bill. Went from paying a minimum of $250/month on electricity and gas, down to $130 on the first month of owning it. I am projected to pay $95 this month, my lowest energy bill ever. The installation (with no C-wire) was seamless thanks to their app; currently only running on 2 AA batteries, and I have had no connection issues. I believe that it requires a 2.4 GHz WIFI connection (as opposed to 5 GHz); if you have both, use the former. The thermostat lets you set a range of temperatures below (and above) which heat (and AC) automatically turn on. Setting mine to a range of 67F to 72F made it so that my HVAC system rarely needed to turn-on since my house is typically in that range. You can also schedule temperature ranges for each day of the week and time-ranges within those days.Sensi really redeemed themselves. I had originally bought the Sensi Lite, which was junk (e.g., non-working icons etc.). This one worked seamlessly.

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.