Emerson Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, Works with Alexa, Energy Star Certified, C-wire Required, ST75W

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I like the ability to use my phone to access remotely. Very simple to install. The app install tutorial provided step by step instructions which were very easy to understand. Nice screen making the current temp easy to read.

First, a quick caveat about this review. I just installed the unit and tested out all the functions on it to confirm that they work. Thus, my experience with this thermostat is only a few hours old, so keep that in mind....Installation was extremely simple. The documentation is quite good, and the phone app walks you step-by-step through the installation process.Integration with Apple HomeKit was flawless and amazingly simple. It all went off without a hitch. Unlike with some products that nominally integrate with HomeKit but provide only a greatly truncated feature set, this appears to be a well-done and robust implementation. You can control the temp with Siri, and add automations readily into your HomeKit "scenes."The Sensi app is also quite good and works well to control all the needed functions. (I haven't tried the Android version of the app, but I'm guessing it would be identical to the iOS app.) The app does provide certain options not found in HomeKit, such as setting up service reminders for filter changes and what not, but for day-to-day operation I think either HomeKit or the Sensi app would work just fine.For those in the family who might not be enamored with using their phones or Siri to control the thermostat, it works very well as a dumb thermostat. It has a big, bright display that's easy to read, and temperature adjustments through the touch screen are straightforward. There's no real learning curve with this device.This seems like a very well thought out and nicely executed piece of hardware. Obviously I'll have to see what I think of it over time, but so far I'm well pleased.Update on 4.20.23: Now that I've had this unit for 3 months I can say that I'm still very pleased with it. It has performed flawlessly.

I replaced my Honeywell smart thermostat with this one for one main reason. That was so I could adjust the circulation time which the Emerson Sensi touch could do. But in replacing the thermostat I have found the Emerson easier to use once set up. It was easy to install on the wall and create an account but for some reason my WIFI connection didn't work at first but checked setup and reconnected again and it worked. So probably my error or a little glitch. The Emerson app is easy to use and make setting changes. The app menus are clear, straight forward and uncluttered.

-------------------------------Update October 2020:--------------------------------Working flawlessly since install. I never notice any issues with it's ability to keep the temperature where I want it.---------------------------------Original Review: Aug 2020:--------------------------------This is a replacement for a Bryant/Carrier T6-NHP 2 wire thermostat used on a carrier Air Handler and a Bryant condenser unit. My problem was that the air conditioner would never stop once it started. I decided that this job is a "Do It Yourself" job due to the pandemic and since I am a retired Electrical Engineer, debugged it on my own.Not knowing much about HVAC, to get started, I had to dig into how it all works. After quite a bit of learning and diagnosing, I finally determined that the old thermostat was malfunctioning. Probably a sticky relay.The first thermostat I tried was the Honeywell RTH7600D which has a dated appearance, and had limited options for different kinds of systems. It would not work with my 2 stage heat pump. Oddly, there was no option to invert the O signal in heat pump mode. Returned.The Sensi cost more but looked more promising. It arrived with virtually no instructions. The idea is you look at web videos and go through the setup screens.Prior to installing, I like to bug out the signals to make sure they work as expected.Two problems here:1) The Sensi needs 24 VAC to work. No sign of a battery. So I ordered a 24VAC power supply.2) The wires are connected to a well designed terminal block on the back plate. No screwdriver needed here, just push to connect, just like a stereo speaker. This block is labeled however, for bench testing, when you snap the thermostat to the back plate to get power, you can access the wires only via probe points. The problem is they are not labeled. I added my own labels here and was able to bug out the unit. Note, there are two methods to bug out the thermostat.1) look for 24VAC on the various pins, while connected to the C wire with the other probe.2) Look for continuity between the Red wire RC or RH and the various output. I found out that the first method is problematic as the unit presents 24VAC to the output when it is active or not. They apparently did not install a pull down resistor on these outputs, and they float high. I consider this a design defect simply due to the confusion it could cause. I suspect it results in a number of returned units, however it is not a functional issue.When I re separated the thermostat from the back plate after debugging, I was surprised to see the LEDs still powered on in the thermostat. Apparently, there is a super-cap or maybe a non-customer battery in there somewhere to keep the unit up through small power glitches.I wired up the unit. and continued the install. Connecting to WIFI was seamless. All it asked for was to identify which network (SSID) to connect to, and the password. Nothing else.The phone app works well also. No connectivity glitches so far.The Sensi does not support the Dehumidify signal on my air handler, but it takes care of dehumidify in a similar way itself. You have good control over that also.The user can also switch on predictive programming, which causes the Sensi to arrive at your desired temperature at the specified time.You can set multiple daily schedules in the app. All pretty straight forward. It appears that you can set as many as 8 set points per day as desired. Unfortunately, the user interface is a bit rough around the edges. Once I created a specific schedule, I could not find a way to delete it. So, just be sure to modify the provided schedule for your first schedule. You can also set the unit to go fan only periodically to avoid stale air in the duct work. The unit knows outside temperature but that is through the web. It does not support the outside temperature sensors provided by my system. I would like to see the unit display the weather on the thermostat, but alas no, but is is on the phone app. It is not clear how much functionality is lost if internet connectivity is lost, but I would recommend a different thermostat if you do not have wireless internet. A nice feature is the web display can show you how many hours the system runs in each mode per day. It does not break down high cool/low cool in 2 stage heat pumps however. I would like to see that feature.There is a modest amount of control over the algorithm, but information provided about exactly what and how the unit does what is does is not to be found. Fortunately, it seems to do its job of regulating temperature in an efficient way pretty well. It is an attractive unit, but be aware that the screen starts to fade out at a 45 degree angle. I will update after I get some more experience, however so far so good.Note: Unit needs to have an internet connection for all but basic functionality.Problem: If unit goes dead, It may not be the unit. Check to make sure you still have 24VAC available. Many HVAC units shut off the 24VAC when the drain overflow switch gets triggered, such as during a drain clog.By the way, Amazon recommended to get a "Emerson F61-2663 Wall Plate for Sensi Wi-Fi Programmable Thermostat", along with this purchase. This is not needed, it is a mistake. Don't order it.

I recently installed an Emerson (Copeland) Sensi Touch thermostat and I’m very pleased with it so far.My HVAC system has a C-Wire, which made installation a snap. Both the Sensi app and online documentation provides easy-to-follow step-by-step instructions. I was replacing an old Honeywell thermostat, and it turned out that the spacing for the existing mounting holes were exactly the same, so attaching the Sensi to the wall was trivial. It’s very easy to connect the HVAC control wires to the Sensi, because it uses a push-to-release terminal block rather than mini-screws. Additional thoughtful features include a back panel with a built-in mini-level and illumination.As an aside, an installation consideration is what size hole for the HVAC wiring exists behind your old thermostat. In my case, the builders were a bit sloppy, and since the Sensi is somewhat smaller than the old Honeywell, a bit of the hole in the drywall can be seen behind the top of the unit. Fortunately, Emerson sells a back panel (available on Amazon) to cover such situations, as well as a kit which includes both the thermostat and the back panel.Initial setup and configuration of the thermostat was very easy. My home automation system uses both Amazon Alexa and Apple HomeKit, so when you configure the Sensi thermostat for HomeKit, the setup for Alexa occurs automatically. Once again, the Sensi app takes you through this step-by-step.Operation of the Sensi is straightforward, both from the touchscreen itself and through the app, including setting up schedules. Voice control of the Sensi thermostat via Alexa seems to work adequately. You can adjust the temperature, ask what the room temperature and settings are, change modes, etc. You can also create routines to do the same, but Alexa doesn’t support event triggers from the Sensi, only actions.In summary, the Sensi Touch is a high-quality thermostat with ease of installation and reasonable Alexa integration. Definitely recommended!