Honeywell Home T9 Wifi Thermostat with Smart Sensor

Name: Honeywell Home T9 Wifi Thermostat with Smart Sensor
Brand: Ring
SKU: B07N849J21
Price: 199.99 USD
Availability: InStock

4.3

2,762

$199.99

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The Honeywell Home T9 Wifi Thermostat allows you to adjust the temperature anytime, anywhere using the Ring app. Set specific rooms on a schedule, or let the sensors respond to your lifestyle—so you come home to comfort and save energy costs when you're away.

This item includes:

Includes Smart Room Sensor
Graphic color touchscreen display
Easy installation and self-configuration
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Works with Alexa.

Enjoy hands-free monitoring with Alexa. Make your home warmer or cooler, save temperatures as part of your routines, and more. Just say, “Alexa, check the temperature of the kitchen.”

A Honeywell Home T9 Wi-Fi Thermostat is mounted on a white wall, displaying a temperature of 72-degrees F, with a bright kitchen and chair in the background.

Tech Specs

Supported Devices

Works with Ring and Alexa.

Size and Color

Dimensions

3.7 x 4.92 x 0.94 inches

Weight

1.43 pounds

Color

White

Display

Graphic Color Touchscreen

Connectivity and Power

Connectivity

Wifi, 2.4 GHZ and 5.0 GHz

Power

Thermostat - Wired (power adaptor included); Smart Sensor - 1 Lithium ion batteries required (included)

General

Box includes

Thermostat, Sensor, mounting hardware

Warranty

2 year limited manufacturer's warranty

Frequently Asked Questions

Where does Honeywell Home T9 Wifi Thermostat with Smart Sensor ship to?

Ships to the US only.

Amazon Customer Reviews

4.3 out of 5

2,762 global ratings

5 star

72%

4 star

12%

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Great idea, not quite ready for primetime

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Amazon Customer

Verified Purchase

Seems like an excellent thermostat. Less excited about the app.

Reviewed in the United States on August 26, 2020

UPDATE- after using the app more, I've decided to upgrade my rating on the app to a B+. The connection issues haven't been a problem, and it is quite capable and easy to use regardless of how it felt during installation. I THINK that when I'm on the same wifi connection as the thermostat that the ...app doesn't have to "phone home" to get info and update settings, which is a bonus.
Hardware still running like a champ, love it.
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The instructions seem pretty thorough. They cover multiple scenarios to make sure that you understand how to get it working. In my case, I had a four wire connection to the HVAC with no C-wire. The system includes an "adapter" that you connect to the HVAC panel, then re-connect your thermostat wire to it, and then finally connect the thermostat. This process gives you a C-wire at the thermostat so the unit has power. Better and prettier but more complicated than a dedicated wall-wart transformer. I've not tried the heater yet (it's August!) but the A/C side is working flawlessly. Installation took about 45 minutes to do everything but the wire pre-labeling, and it worked the first time. Controlling the unit from the panel is easy. Connected to the remote sensor fine. Can set the time and schedule, use motion detection to determine active room, everything it's supposed to do. Scheduling options are great. BTW, the main unit and the remote sensor report humidity too! All good.
And then, I turned on the wifi. First thing it did was reset the time, I think to UTC. Then you have to download/install the app (ok), register a new account with Honeywell (ok), and create a location (e.g. "home." Possible to use the app to control multiple thermostats at different locations.) NOTE: If you don't let your phone or tablet use location data, you apparently can't create a location and the app just spins, but the app doesn't tell you that. Then connect the app to your thermostat. Honeywell emails your account an activation code that you then enter at the thermostat (somewhere around here it figured out my timezone and fixed the clock). Eventually it's all set up and your problems are over, right? Nope. I'll be poking through the app and at random times it'll claim I have no internet, but I'm sitting right next to my wifi and using internet on other devices. Having said all that, the app does function, controls the HVAC fine, lets me do what I need to do. It's not hard to understand or use, but the drops might be really annoying if they got in the way. I've not tried geofence and don't plan to, but that might be a good app test. Also the app is designed to work with a lot of devices. Thermostats, security systems, and more. Great on one hand but possibly causing loss of focus. So, overall:
Hardware: A+
Instructions, ease of installation: A+
Honeywell App: C+

Most desired improvements: Fix the internet connection issue. Offer more options for programming, like "if there is a difference of degrees between sensors, turn on the fan," or allow the system to run based on humidity/heat index. Read more

Amazon Customer

Verified Purchase

Super easy install, works great!

Reviewed in the United States on June 16, 2019

(this review is long but detailed - hope it helps someone)

I hesitate to review this thermostat too soon, as I bought a Honeywell RTH9585WF1004 ($200) 14 months ago, gave it a good review, then 13 months later it completely lost any accuracy of the actual temperature - and why I now have ...the T9. I also hesitated to continue with Honeywell, as the past 2 wi-fi thermostats from Honeywell were horrible (TH9320WF, returned within one month, and the RTH9585, worked for 13 months) - but I didn't like the other brands available. The T9 is brand new, and the remote sensors sounded awesome for my house - 2 story, 1 AC unit, terrible air circulation, temp varies between floors/rooms.

INSTALL: I removed the inaccurate Honeywell RTH9585, and installed the T9 according to the very basic install instructions. I had one issue with installation which was my own fault - set the wrong type of HVAC unit in Setup, so the AC wouldn't turn on - then I caught my mistake. I'm still not entirely sure I have the correct type selected, as the T9 indicates my heat pump is 2-stage and I don't believe it is...I'll find out in Nov when I need heat in Arizona.

SMART ROOM SENSORS: Bought a total of 4 Smart Room Sensors, 2 for upstairs (one in M Bed) and 2 for down. After installing the Base unit, went to Settings and simply followed the unit's displayed procedure for installing/naming the Smart Room Sensors (place one sensor, return to the Base, name it, then go on to the next sensor).

SCHEDULING: This section was really easy setting up a "5+2" day schedule which allows for multiple Away/Stay cycles (vs the usual 2 On/Off, On/Off cycles on previous thermostats). It was also really easy choosing which Sensors to use in the programming. Example: WAKE time, I'm in the Loft on the computer, so that's the Sensor that the Temperature is based on. AWAY time is mid afternoon (Peak Pricing) so the temp is set higher. HOME is at evening (when Peak Pricing ends), I'm always downstairs in the Kitchen or Family Room, so the Temperature is based on those 2 Sensors, SLEEP at night the Temperature is based on the Sensor in the M Bed. More cycles can be added - I'm not sure if they can be named differently. I have the sensors set for times, but they can be used as motion detectors to detect Activity, making them active. If multiple sensors (that you selected) detect activity, the temperature is based on the average of the Active sensors. I don't know what happens if a sensor senses brief activity (like grabbing something from the kitchen then leaving that room, example) or what happens once one goes to bed, thus there is NO activity. For me, using set times is better. Geofencing is also an option but not one I need/use. It detects (via your cellphone) when you're in/out of range and adjusts the temp based on that. (how it works with a family, I don't know) I'm honestly not gone for more than several hours at a time, plus I have a zoo so can't let the house get too warm/cold.

HONEYWELL HOME APP (Android): After a week using the Schedule I'd set, it needed a bit of tweaking with some temp changes and changes in renaming/moving a Sensor. I had already installed the Honeywell Home App on my phone but hadn't really messed with it - so I did my "tweaking" of the T9 programming through the App, not the Base unit. It was a bit confusing at first (it's not super intuitive) but, once I got the layout of the App, I was able to make temp changes, move a Sensor, rename a Sensor, adjust some minor details. Using the App (once I got the hang of it) was easier to program the T9 than using the Base unit - I was able to do it sitting down in another room vs standing, hunched over at the Base unit. The App can't be used for the Initial Setup of the Base unit, obviously.

CONS: 1) Wi-Fi is supposed to be 2.4Gh or 5Gh. I tried to set the Base to my 5Gh signal...it found the signal but would not connect to it - I got an error message and told to contact Honeywell Support. I didn't want to mess with that (I've read it needs a Firmware update - I just haven't checked if that's true) so it's set to the 2.4Gh signal. Honestly, don't know what diff it makes, why would a thermostat need a faster signal? Only reason I can think of is that my phone is set to the 5Gh and the T9 to 2.4Gh - BUT I was still able to reprogram the Base using the App, so I don't know.
2) The instruction manual is very basic; it gives very brief install instructions, the pictures of the wiring could be a little bigger/clearer. There are no instructions for installing/setting up the Sensors (the Sensor box has a very brief install/program/pairing instruction). That's all described (fairly well) on the Base units display.
3) The Honeywell site has no more instructions than what's in the box. There are some VERY short (~2min) videos on how-to for a few basic things but I didn't watch them. An Online User/Help Forum would be a great addition, I'm sure most people have the same basic questions and some need more detailed instructions - forums are super helpful. It's possible they do have a Forum somewhere but I didn't see one or a link.
4) Alexa is supposed to work with the T9...and it does (once you add the Skill through Alexa - make sure to remove the app/skill for older thermostats) but it's rather confusing. The Alexa App did a search for new items and it found the T9 Base, as well as the 4 Sensors. I can use really basic commands BUT you have to use the name you gave to the Base and/or Sensors...I said, "Alexa, raise the temperature 1 degree" and it replied, "I found multiple items...". I haven't explored it enough to know whether I can say, "Raise the temperature of Kitchen 1 degree" or so on for the other Sensors - and again, Honeywell has NO online instructions for using Alexa or other voice apps. On the other hand, for now I have the programming/scheduling JUST right for all rooms and various times of day, so I've not needed to change it since my tweak.
5) The price is a bit high. Over $300 for the T9 and 4 Sensors (especially since I spent $200 last year for the previous Honeywell unit). So far, having the house a LOT more comfortable and NOT having to be changing the thermostat setting throughout the day, it seems to be worth the money.
6) The sensors are applied using double-sided tape. This is both a pro and a con. Even after cleaning the wall where one sensor was going, the sensor fell off the wall 5' to the tile floor. The tape is nice for not having to use screws and in that I decided to move one of the sensors, but I'd feel better using a screw.

PROS: 1) It's only been 2 weeks, but the T9 is working great and it's nice having various rooms of the house at slightly different temps at different times.
2) Easy installation. For my HVAC unit (12 yo heat pump) the wiring was simple enough and I already have the C-wire. The T9 does come with an adapter for homes without a C-wire, I don't know how easy it is to use.
3) The Setup was actually very easy to use (aside from the 5Gh Wi-Fi not working).
4) The Honeywell Home App is also easy to use, once one understands the interface.
5) Multiple Home/Away cycles. I'm generally home all day so I don't need more than the usual 2 On/Off, On/Off cycles but I'm sure the additional cycles are convenient for some households.

Final thoughts: I've read several other reviews complaining of needed firmware update and a hassle of needing to use 2 Wi-Fi phones to do the update. I couldn't get the 5Gh to function, but the 2.4Gh works just fine. I guess some people have their Wi-Fi set up so there aren't 2 separate signals? I'm not sure - but I might find out someday if I ever decide I really want the 5Gh signal. I've also read people complaining about the App not working. I've had no issue at all with the app. Also, I've seen people state that if the power goes out, the entire T9 configuration and schedule is lost. I haven't had power issues, I just hope that's not the case. One would think that the settings are saved either at Honeywell Cloud or on the phone, if not the unit itself (though it doesn't use batteries). I hated the previous Honeywell Wi-Fi thermostat, but it never lost it's programming so I can't comment. In my experience so far, even though the included instructions were very basic, the setup for the T9 was straightforward and easy to comprehend using the Base unit's displayed instructions. I only hope that I didn't spend $300+ on a Honeywell Thermostat that will only last 13 months, as my last $200 unit did. So far, I love it. Read more

Amazon Customer

Verified Purchase

Great Thermostat, Easy Install especially with the Wall Plate Adapter

Reviewed in the United States on July 9, 2024

First the install is very easy if you are replacing an existing thermostat that has a C wire, a C wire adapter is included but I did not need that in my case. Secondly if you are replacing an existing thermostat, especially the traditional rectangular form factor, I HIGHLY RECOMMEND purchasing the ...THP2400A1080 wall plate adapter or the generic version which is much cheaper. It makes install of the T9 even easier.
This thermostat has 3 holes you need to drill which are probably not in the location of the ones for your old thermostat. The wall adapter allows you to use the existing holes from your old thermostat then the UWP/mounting plate from the T9 (or any honeywell thermostat that uses the UWP) just clicks onto the adapter without new holes to drill. The cover plate from the wall adapter is then large enough to cover the area of your old thermostat.

Now for a review of thermostat itself. My setup is a 2 story home with single stage forced air AC with a single stage gas furnace on a 2 zone system (upstairs and downstairs) so I bought 2 T9's that replaced 2 old smart thermostat (old honeywell with basic wifi and online scheduling capability). The old thermostats worked fine but I upgraded to the T9 to hopefully mitigate unbalanced temps between rooms on the same floor as well as between the 2 floors. It absolutely worked as I had hoped. It has only been a few days but I can immediately tell the difference in temperature balance between the rooms and the floors in over 100 degree weather.

How are these thermostats helping balance the air temp? First the room sensors allow you to prioritize which rooms are being used for temp readings at different times of day or based on activity. This can be done by either specifying a single room (or group of rooms to average the temperature) or by activity (also individual room or averaging multiple rooms). During the day I can prioritize the living spaces and at night the bedrooms for temp readings. This combined with the auto recirculation mode of the fan allows the fan to recirc air about 20 minutes every hour even when the heating or cooling isn't actually running. Over the course of a day this really has helped balance the air between rooms and between the floors on my 2 zone system. Using the energy monitoring from my solar panel system I can already see a drop in energy usage as my AC has not had to run as much overall to make the occupied rooms comfortable.

Also my thermostats are in stupid locations so the room sensors help with that. The UWP on the T9 is great as one of my thermostats is on the wall between the house and the garage which has a large hole for the thermostat wiring. The UWP for the T9 has a door that closes off that hole and the wiring before you attach the thermostat, so it is not reading any of that hot air coming from the wall. I confirmed this as my old thermostat use to read 2 degrees hotter than the rest of the hallway, verified with a separate thermometer, on a 100 degree day. The T9 now reads the same as the thermometer

In terms of why I chose the T9 over a Ecobee or a Nest, basically the T9 generally is cheaper. The T9 thermostat with a room sensor can be had for as little as $143. The other popular options cost more. While the additional features of the others may be worth it to some I simply would not use those features. For example, I am not going to talk to my thermostat. I am just gonna set the schedules and let the thermostat do its think and it still has integration to those systems if I choose to have that functionality later.

Overall, great value smart thermostat that does what it needs to do. If I had one complaint is that this thermostat, and Honeywell thermostats in general don't allow you to adjust the differential (the plus or minus above or below the setpoint the thermostat kicks on or off the air/heat) This seems to be set at a +/- of 1 degree and no way to change it. Some may prefer a differential of 1.5 to 2 degrees instead. This is somewhat mitigated by using multiple sensors to average the temperature but a differential setting adjustment would of made this thermostat almost perfect. Read more

Amazon Customer

Verified Purchase

Great thermostat but beware of the "C" wire requirement

Reviewed in the United States on November 28, 2022

My purpose in buying the T9 thermostat was to better regulate the temperature in our master bedroom during sleeping hours. Using the remote sensor included in the package, that goal has been accomplished. At nighttime I set the system up so that it looks at that sensor only. The system is very fl...exible in that you can give "priority" to any combination of the devices you connect to the thermostat (up to 20). If you select multiple devices, it will work toward achieving your desired temperature over the average of the selected sensors.

One reason why I purchased the Honeywell T9 as opposed to competitive units (e.g. Nest) is that my understanding is that some of the others will not allow you to set a temperature and hold it. I would rather have personal control over the temperature in my house as opposed to leaving it to a "smart" algorithm.

The installation instructions are very detailed, but I had a couple of problems. First of all, this thermostat requires a "C" wire. If you don't have this wire, you use the included adapter which must be installed at the furnace end. That can be problematic, depending on your particular furnace configuration. I didn't have the a "C" wire connected to the old thermostat, so I thought I needed the adapter and started that install. The instructions give the expectation that there is a nice, neat terminal strip in the furnace to connect to. Instead, my HVAC unit was like a "bowl of spaghetti" wires connected with wire nuts. I finally realized that the HVAC installers DID connect the "C" wire on the furnace end but that it was tucked inside the wall on the thermostat end. With that realization the installation became relatively trivial. The manufacturer covered this in the instructions but it can be easily overlooked. If you have to dig into your furnace the probability of a DIY error increases dramatically. A video would have been helpful.

My other problem had to do with the setup on the thermostat end after completing the physical install. Certain steps can be postponed until later so they say, but if you do, good luck! For instance, my experience was that I couldn't connect my smart phone to the thermostat because I had initially skipped that step. In the end I did a factory reset, didn't skip any steps and the smart phone connection went as planned.

Another issue had to do with the geofence option. Once your phone is connected you are given the option of setting up geofence. I did that but later decided I didn't want that option, but it wouldn't let me remove it! You can temporarily disable it, but you can't totally get rid of it. Note that if you use geofence you cannot setup a daily / weekly schedule. I had to remove the thermostat from the phone app and, once again, do a factory reset to get rid of geofence. After that, no problem.

I am very optimistic that this product will meet my needs very well and would recommend it to others with the cautions mentioned above. It looks good and performs well. Read more

Amazon Customer

Verified Purchase

Best Features Of All Smart Thermostats

Reviewed in the United States on February 15, 2021

I shopped my smart thermostat for a long time and came to a few conclusions:

1. All the so-called "AI" features on Google Nest and other smart thermostats are just a gimmick. The reviews on those products prove this, you can find an endless stream of comments saying it "learns" to do the ...wrong thing over time. One need only watch the 1984 classic "The Terminator" to know why we can't trust the robots with control over our most precious technology. These features are supposed to make your life easier by not having to set a schedule. I found the schedule feature to be incredibly simple and intuitive on this Honeywell device. I included a picture of the interface. I programmed it in about 3 minutes from my phone.

2. The other smart thermostats are not pleasing to the eye. They may look good on modern homes but in a somewhat plain or modest home they stand out and not in a good way. I needed a simple white thermostat with an easy to read display for anyone at any height level. The Honeywell is simple and uses all the device space as one huge screen. It's like the Tesla of thermostats in terms of screen size and display information at a glance.

3. This thermostat is able to be locked down such as in a rental or AirBNB. Meaning the settings can't be modified other than adjusting the temperature up and down. This is basically a simple mode for the whole family or for your renters. They need to be able to adjust the temperature but they don't need anything more than that. It's great for family uses but if you're a professional property manager there is an upgraded version that can be operated in bulk. I like to just buy the best on the market so I shopped that option and decided that I don't need those features so this is the best on the market for residential use.

4. I used an installation service with OnTech. I learned about them from getting my Ring Doorbell installed with them. They gladly installed this device too and it works really well. They said the installation was very standard and nothing special on my particular house and hardware. I would really suggest doing this installation if they service your area. It was cheaper than hiring a professional electrician and the workers they sent were more professional and knowledgeable on smart home installations than a typical electrician.

5. The app is really easy to use. I set up an account then logged in wife's phone with the same account and we can both manage the temp. We don't have to because the schedule works great but sometimes it's nice to adjust it from the couch without having to get up.

6. It's all about sensors. Sensors sensors sensors sensors. Did I mention sensors? None of the other smart thermostats have room sensors. Their supposed smart features just learn from your personal behavior not from any real world information. So if your family gets up and adjusts the thermostat randomly one day it learns that behavior. Very useless behavior. This actually reports real time temperature and activity information from your room sensors and adjusts the heat and air conditioning based on that data. For example you can set the priority to "active rooms" and it will prioritize rooms that show activity. Or you can use GPS settings to prioritize when you're home and not head the house when you're away. Lots more actual smart features on this device than the competition. These features are not gimmicks they are real features you can rely on.

I wrote this review because I spent a lot of time researching and thinking about the options. I hope it helps a few people make the decision. Please hit the "helpful" button for the next person that is walking this path and might need a little help. Read more

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