Emerson Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, Works with Alexa, Energy Star Certified, C-wire Required, ST75 Black 5.625" x 3.4" x 1.17"
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Availability:
Only 1 left in stock, order soon!
Arrives
Jun 19 – Jun 27
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Color: Black
Features
- PRIVACY PROTECTION*: Sensi wont sell your personal information to third parties
- EASY DIY INSTALLATION: Use the built-in level, illuminated easy-click terminals and step-by-step app instructions for a quick installation; Works with the HVAC equipment found in most homes. Common wire (c-wire) is required
- 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
- SLEEK, MODERN DESIGN: The large color display features easy-to-read temperatures and intuitive menus. Available in black, white and silver to complement your home decor
- CONTROL FROM ANYWHERE: Remotely control your home comfort from your smartphone or tablet using the Sensi mobile app for Android and iOS devices
- 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
Description
Sensi touch smart thermostats are designed for energy savings and data privacy – to give you full control of your home HVAC. With over 100 years of HVAC experience, you know our expertise already, even if you didn’t realize it. Emerson produces many of the HVAC parts that our smart thermostats control, so you can feel confident in the product you put on your wall. With our top-rated mobile app and easy installation process, customers of all comfort levels can make the switch to a Sensi smart thermostat. In addition, our customer service team of HVAC experts is always available to help you through any questions you might have. For more information on Compatibility, Energy Savings, and Privacy Protection, please refer to the “Product Documentation” section below.
Brand: Emerson
Model Name: Touch Wi-Fi Thermostat
Product Dimensions: 1.17"D x 5.63"W x 3.2"H
Special Feature: Filter Indicator, Geofence Technology, Auto Changeover, Daylight Savings Time Ready, Programmable
Brand: Emerson
Model Name: Touch Wi-Fi Thermostat
Product Dimensions: 1.17"D x 5.63"W x 3.2"H
Special Feature: Filter Indicator, Geofence Technology, Auto Changeover, Daylight Savings Time Ready, Programmable
Color: Black
Specific Uses For Product: Boiler, Air Conditioner, Heat Pump, Furnace
Temperature Control Type: programmable
Connectivity Technology: Wi-Fi
Included Components: Installation Guide, Warranty Booklet, Thermostat, Mounting Hardware, Owner's Manual
Power Source: AC/DC
Item Weight: 0.85 Pounds
Voltage: 30 Volts
Material: Plastic
Shape: Rectangular
Display Type: Touchscreen
Screen Size: 4.3 Inches
Control Type: App Control
Control Method: Voice
Connectivity Protocol: Wi-Fi
Mounting Type: Wall Mount
Style: Black
Backlight: Yes
Specification Met: Energy Star
Number of Batteries: 1 AA batteries required.
UPC: 786710554841
Global Trade Identification Number: 41
Manufacturer: Emerson Thermostats
Item Weight: 13.6 ounces
Department: Unisex-Adult
Item model number: ST75
Batteries: 1 AA batteries required.
Is Discontinued By Manufacturer: No
Number of pieces: 1
Warranty Description: 3 years.
Batteries required: No
Import: Made in the USA
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jun 19 – Jun 27
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Black
I have 4 of these installed as of now. They all work flawlessly. Easy to set schedules for heat and cool, even both. Connect to internet well and stay connected. Straight forward installation if you are careful.
Reviewed in the United States on October 21, 2024 by SHM
Color: Black
Update #3 (25 Feb 2023): Well, it has been over 4 years already and the thermostat has been working flawlessly all this time. We've lost power to the house several times over those four years, we've had numerous internet outages, and I've changed out our cable modem and wifi router a couple of times with the latest setup being a mesh system. The Sensi has weathered all of that, coming back online each time and running without a glitch. I'm not sure what more you could ask of a product. Definitely a 5-star item! Update #2 (2 Dec): Just a quick update to report that the thermostat has been working great now for over three weeks... no glitches, no wifi disconnects, and no reason to believe there will be any issues. The connection to Alexa is also great and very responsive. Very happy with this choice for a new thermostat! Update (10 Nov): I've updated my rating to 5 stars now. The Support team contacted me by email and provided a detailed rundown on configuration settings available under advanced settings. It turns out that the Sensi had auto-configured to a different type of furnace than I have, so once I made the appropriate changes I was able to reconnect the Green (fan) wire and the unit works properly. I'm not sure why this information isn't provided in the setup documentation, but I appreciated the Support team providing a courteous, prompt and detailed response. I also loaded the Alexa skill for Sensi, which set up quickly and it works well. I can now inquire about temperature or change the setting by voice. And of course when away from home, it's nice to have a single app (the Alexa app) where I can communicate with furnaces, light switches and electrical outlets if I want to. The bottom line after having the unit in place for several days: I like it and am rating it 5 stars. Yes, it was a little painful getting here, but it's doing what it's supposed to, it's very easily programmed with any schedule you like, the wifi continues to function normally, I like being able to check my phone from anywhere and see what the furnace is doing, and I really like the way it looks on the wall, including the color change when it turns on the furnace and the dimming feature that provides a dim display of temperature that isn't overly bright or annoying at night (of course, you can shut this off). I like it enough to overlook the start-up issues. Providing it continues to work properly in the coming weeks and months, it's exactly what I was looking for. Original review (8 Nov): Although there are mixed reviews of this thermostat, many of them appeared to be software related, and software can be updated if the company stays on top of issues, so I thought I'd give it a try anyway. It's definitely a nice, sleek looking unit, and programming/using it is straightforward and very flexible as you can set up virtually unlimited schedules. Hooking it up was pretty easy, as there is normally no real rocket science to thermostats and furnace control. My upstairs furnace is about 18 years old, and control requires minimal wiring. So while the original thermostat had 4 wires connected (Red for 24 VAC power, White for heat call, Yellow for cooling call, and Green for fan control), I had no common (C) connection available at the wall. Fortunately, the cable had six wires in it, so a 10 minute visit to the attic (where the furnace is located) and I had one of the spares connected to the furnace C terminal. Fired the furnace back up and the Sensi came to life... and this is where some minor troubles began. Setup to wifi requires doing a little configuring using the Sensi app. I installed the app on my Samsung (Android) phone, which completed quickly. Unfortunately, when the Sensi wifi transmitter was supposed to be transmitting, the app was unable to find it. Checking for all wifi signals on my phone, there was no signal from anything other than my router and a weak router signal from a neighbor. I tried switching the Sensi wifi on/off a few times with no results. Then I found a system reset option, so I tried that and the display simply hung... no reset, and no ability to do anything. I figured this might be a good time to call the Support number, which I did. They responded within a couple of minutes (which is great), and the solution was a power cycle, accomplished by simply removing the Sensi from its base on the wall and putting it back after 5-10 seconds. This time, the wifi came up as it should, so I hung up with Support and I was able to configure the thermostat. I noticed the room temperature indicated 77 deg, which was about 9 degrees higher than it actually was, based upon two other digital thermometers that both read exactly the same (68 deg). Then, about 5 minutes later, after tinkering with system options in the app and finding a temperature offset adjustment that provides only up to plus or minus 5 deg (well short of 9 deg), suddenly the Sensi went offline and the initial wifi setup screen returned on the unit. At this point, I could have just gone thru the wifi setup again, but with the significant temp inaccuracy, I thought I'd call the Support guys again and discuss what was happening. Again, they picked up within just a few minutes. The solution here was trying a system factory reset, and this time the splash screen came up after half a second rather than hang like the first time that I tried it earlier. Apparently, the factory reset also initiates a calibration, which for some reason can take a full day to complete... but it doesn't impact being able to use the thermostat. So, following the reset, I hung up and completed the setup again. Things were back to normal, and within a couple of hours the indicated room temperature slowly moved downward to within 2 deg of those other thermometers. By the next morning, it was still 2 deg off, so I selected the -2 deg offset and all was well. So clearly, the calibration function works fairly well. After operating for a while, I found that the cycle rate was much too fast as the furnace would start back up shortly after shutting down, so I adjusted that to the "slow" setting. After letting it run overnight, I discovered in the morning that I no longer had heat! After a little checking, it turns out the flame sensor in the furnace was no longer detecting the flame, which after a few seconds shuts the flame off. After three such cycles, it locks the furnace. This wasn't initially apparent because the Sensi wants to start the blower fan when it calls for heat, so it sounds like the furnace is running... except it's blowing cool air. Furnace electronics are designed to allow the furnace to start up and develop a little heat prior to starting the fan... this is unnecessarily overridden by the Sensi. My belief is that this air flow starting before the furnace ignited must have had some effect on an old and somewhat dirty flame sensor. Cleaning the sensor fixed the start-up problem, but it still makes no sense to blow cold air out the ducts on start-up. So for now, I simply disconnected the Green fan wire attachment in the Sensi base, and everything is working normal. I sent a summary of this concern to Sensi in writing, questioning whether there's an app setting I missed, or this unit (when set for gas heat) is defective, or perhaps this feature is a design flaw. I'm awaiting a response. One other note: there's apparently at least one little bug in the app... occasionally when you're connected to a specific thermostat and you use the back arrow button to go to the previous screen that lists all thermostats (of course I only have the one), the app will display it's "working" indicator (an animated blue target looking thing) continuously and not take you back to that screen. Killing the app and starting it up again returns things to normal. It's minor, but it has done it a few times and it would be more pleasant if it always worked. So after a rough start, things seem to be working, albeit with my little Green wire modification. I'll update this review as I learn more or if there's a failure anytime soon.
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Reviewed in the United States on November 7, 2018 by Rick
Color: Black
Yes, I give it 5 stars. I love the thing. It was easy to set up, and I've had no issues at all with the software. I love finding my bedroom getting too hot at 1 AM and being able to simply roll over and reset the temp with my phone. Also, as I have an exotic bird, I don't use the geo fencing, as it needs to stay warm enough for her, or cool enough. But, I can see the temp when away from home and adjust it, if necessary. So, why the BUT....? Well, before you buy it, you should understand that this needs a 'C' wire to function on ANY level. Many similar thermostats that require a 'C' wire, also accept batteries. With batteries installed in them, they can control the system, like any normal thermostat. All that they are missing without the 'C' wire, is the wireless functions. But, this Sensi model doesn't accept batteries, at least I sure couldn't find any place for them. Also, in a response to a customer's question, the seller mentioned that this model requires the 'C' wire for ALL functions. In spite of this, if you look above, at the product specs, it states that it requires 2 'AA' batteries! But, the thing is a sealed assembly with no place to install any batteries. So, if you buy this and think you'll go ahead and install it and use it without wireless until you can solve the 'C' wire problem, DON"T! Have everything ready, including either a 'C' wire (which in some cases can be added, running directly from your HVAC unit to the Sensi thermostat), or a supplemental transformer to replace the 'C' wire, BEFORE you remove your old thermostat. I saw this battery issue when I received my Sensi, so I ordered a supplemental transformer from Amazon, that was to arrive the next day by 9:00 PM. The next afternoon, expecting to have the transformer by 9, I installed the thermostat. The carrier that was to deliver the transformer lost it! I got an email at around 4 PM telling me so. So, in order to be able to have AC in my bedroom that night, I had to drive to Home Depot and buy one, and it cost me $4 more than the Amazon unit, which I returned to Amazon. But, they paid the shipping for me. So, if your system doesn't have the 'C' wire, learn what it is going to take for you to add it with a supplemental transformer. Be sure you're up to the job (it really is easy), and order both the Sensi, and the supplemental transformer, together. Don't let the 'C' wire intimidate you. It's not that hard to install the supplemental transformer, and you can make it look better if you use surface mounted wire races (available on Amazon) between the thermostat and the supplemental transformer, to hide its wires. The supplemental transformer has 2 wires, but it's AC (alternating current), so it isn't necessary to observe polarity. You simply hook one wire to the same terminal as the red 'R' wire in the thermostat, and the other wire connects to the thermostat's terminal labeled, 'C'. Simple! Also, you do have the option of using any 24 VAC transformer with a MINIMUM of 300 milliamps of current available at its output. Transformers sold for this purpose have exactly that voltage and current. But, it's acceptable to go higher in current output. Doing so simply gives you headroom, and lets the transformer run cooler. But, NEVER go LOWER than 300 ma. Voltage is another matter. You can go up, but only about a volt, or 2, which is what I did, as all I could find was a power adaptor for a Rain Bird sprinkler system that was 25.5 volts AC at 750 milliamps & cut the plug off the end of the wires, so I could hook them to my Sensi. So, if you can use a screw driver & some wire cutters, or sharp scissors, buy one and enjoy!!
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Reviewed in the United States on June 6, 2019 by BlueSteve