So which thermostat should I leave up: the T9 or Nest? Is it still time to abandon Nest?

I just switched from an older Honeywell TCC smart thermostat to the T9 and I am super impressed. I really like the tighter temperature control and I love the circulation setting for the fan. I have temperature sensors throughout the house and once I added the T9 with room sensors I can see that heat is more even throughout the rooms which is much more comfortable. We have a fireplace in the basement, that room would get pretty warm, now the T9 will turn the fan on and circulate some of that heat (bonus for me!). I am also using a mix of room prioritization and geo fencing. I was a bit put out by the inability to use a schedule and geofencing at the same time but to be honest within a few days I quickly realized that I don't need it with the T9. I like the aesthetic look on the wall, and the app is easy to use and works well. Note, the T9 is now compatible with HomeKit. I am personally using our T9 integrated with Home Assistant; it was a bit confusing to get set up but as powerful as home assistant is, it can be confusing. Once I got them linked, it works great.

Lots of great details. Thanks Reed.

A sensor is included ONLY if you buy the "T9 with sensor" box and NOT if you buy the "T9" by itself. And more news for you: The T9 became compatible with HomeKit in early November 2021. Even more news: Honeywell says that the T9 will be compatible with Matter in 2021, and since Apple will too, that's another way to make it work with HomeKit. I just bought my T9 today and if you don't hear back from me tomorrow, that means I got it working with HomeKit.

I'm pretty sure I'm in the minority here, but I have a Sensi by Emerson (non-touch screen). Its very basic but does support IFTTT, ST, and Alexa. My only issue with it has been the wifi connection drops sometimes, but an update last year seem to fix that. With the Sensi you can set the temp off-set by as much as 5 degrees (i think). So you can have it start AC 1-5 degrees above set temp and turn off 1-5 degrees below set temp. This is true for heat and AC.

Hi. After studying both, I bought two T9s, with 4 additional sensors. I really like the T9, especially the room averaging feature and the tight temp control window. No regrets.

I’ve had my eye on this thermostat. IF they ever add HomeKit integration, it looks like a good competitor to the Ecobee with the room sensors and all.

T9 all the way. I like my "deadband" (temperature range) very tight. 1 degree or even 1/2 degree depending on the system. I have my remote sensors just sitting on a table in the room I want to prioritize. This way I can move it from the family room to the guest room when we have visitors. Otherwise, the guest room gets most hot or cold depending on what mode the system is in when the sensor is outside the guest room.

Great overview of unit AND sensor

We just got the nest and so far so good, but I’ll be interested to see what your long term experience with the Honeywell is like

I'm using the T9 on one of my three zones. So far, so good! The master suite was running hot at night and now it's perfect!

we love the T9 one of our rooms get cold but we put the sensor in that room and the temp balanced out to about 78.

Great review. Thanks

I have the Honeywell and Eero WiFi. The Honeywell is constantly reporting that it can’t connect to WiFi because it doesn’t support 5ghz yet won’t limit itself to 2.4ghz.

I really want the T9 but HomeKit “coming” holding me back 😂

I have a NEST and am frustrated by the temperature swing as noted in this video. I will try the T9 in next few weeks. This article makes me think I will like the T9 better.

It works just fine. I like it.

@Smart Home Solver Can you connect Honeywell T9 to a humidifier, to control the humidity inside your home? If so, does it have blower activation for humidifier? blower-activation means, thermostat will use the blower to activate the humidifier regardless of furnace kick in or not.

My Nest causes warm air to blow when the AC is on. Might give this a try

Hi, I'm trying to solve the temperature difference between upstairs and downstairs. The home original have only 1 control which is in the upstairs master bedroom where it is the warmest. Would using T9 with multiple sensor help with the temperature difference? Or is there any other devices you would recommend? Ideally I would like the sensor to be either in the upstairs living room or in multiple rooms. Thanks!

T9 !!! Honeywell makes great products!! They’ve been in the business longer than nest.

I'm looking at getting a new AC. Leaning towards the variable speed Bosch. Any concerns over this new T9 working with that 5T Heat Pump? Thx Patrick

Could I connect the T9 to like a space heater connected to a smart plug and just heat up that room individually?

The Nest has room sensors too and their smoke detectors interlink with the thermostat and shuts the central air system down if they detect smoke and or carbon monoxide...

Nice review. Could you put a remote T9 sensor in an entry way and have motion take the HVAC out of Away Mode without prioritizing that sensor for temperature?

My ? Is what's to point to this? Because if u want ur Master bedroom 75° and ur family room 78° ur whole house ac will run till the master hits 75° in turn making the entire house 75° correct? It doesn't stop the ac air flow to my family room at 78..

Hmmm. Thanks. I just had our upstairs AC replaced, and requested the HVAC man to install a T9 which he did. The sensor, we put in our master bedroom. As we go into the doorway, I put it up on the wall there. (I drilled a hole and used a wood screw instead of the 3M tape as I did not trust that tape on a painted wall) About 3 feet from the wall is the bed. Well, it is supposed to detect activity in the room and sense if the room is occupied. I don't buy into that, because in the morning, I find that the sensor thinks no one is in the room so it changes priority to the hallway main thermostat. Maybe we need to be jumping up and down in bed all night to make the sensor realize we are in the room! Hahahahah! This T9 thermostat uses the Honeywell Home app, whereas the earlier one like the model 9000 we have downstairs, use an app called TCC. Short for Total Comfort Care or something like that. I was told by Customer Service that they have delegated all this electronic management to a company called Resideo and they will combine the two apps soon. But this is the first time we've used an "Auto" setting which is great in spring and fall here in North Carolina. Two days ago, it was 60 degrees outside at night and 78 degrees in the day. So we chose only two times, day and night. Day we use 70 for heat and 77 for cool; at night, 66 for heat and 76 for cool. Works great, and we don't even bother to fiddle with the thermostat. But I do need to fiddle with the room sensor settings and give priority to the master bedroom. Only trouble is, daytime there is so much glass in that room that the sun streaming in heats up that room so much, it quickly jumps to cool mode so the rest of the upstairs gets unnecessarily cool.

I do wish that the Honeywell geofencing had a way of sensing someone in the home if the phones are not there or shut off, that is a benefit of nest for sure but the sensors in the t-9 are a game changer and are def worth it, we have a three story townhouse and the sensors make a big dif!

Hello everyone. Would the thermostat itself be considered one sensor? For instance if I put a sensor in master bedroom and the thermostat was in the living room I could make it average the two right? We don’t care as much if the basement is a little colder.

My nest was malfunctioning. I just purchased one and the temperature sensor in the unit was faulty. I never heated my house up very well and it would go into these random cycling modes where I would turn my furnace on and off very quickly. Went to home Depot to get a new one and I decided to instead get the t9. Way better.

The T9 seems like a really solid thermostat, but let's see what happens with HomeKit integration.

Which one did you end up keeping?

What these thermostats need is way more configurability. Let me decide if I want swing

My grandparents have a Cheapo Honeywell thermostat. Does the T9 have the same pin layout on the back as the cheapo Honeywell thermostats?

It’s compatible to heat with radiators and also to cool with AC?

I've had a Nest for about 6 years and it works just great. But with Google making changes I think I'm done with Nest. I absolutely hate Google with a passion and only tolerate them when I have to. I'll be looking at the T9 and Ecobee for my next thermostat.

Nest is terrible. Had to return it. House would get too hot or too cold with that format it had been setup.

IMPORTANT NOTE: The T9 cannot use a remote sensor alone to control the temperature in one room per the schedule. Yes, you can set the T9 to prioritize a remote sensor until the next change in your schedule happens. You can even see this in the video shown here when it shows "Hold Until Next Event" at 2:51. If you need a room to be scheduled you would be better off installing a full thermostat in that room.

You reccomend the Honeywell over the ecobee with voice control. The new one ?

Hi there, I'm looking to your videos and I really like them. They give me many new ideas. I would like to control my live line 240V old thermostats. I could not found any up to now. I would like to control all of them with sequence each days. Could you help me? regards

Hello Reed I am remodeiling starting Sept 1, 2022. I have a home with 6 Baseboard (heat only) Thermostats AND 3 Heating / cooling thermostats. In other words I have 9 zones of heat and 3 larger zones of cooling. So I need 9 thermostats. I know Matter is coming. I seek thermostats that can work under one platform together. Meaning I dont want to hit away mode 9 times on my phone when I leave the house. I suspect Matter would do this, but I wonder if a Resideo hub would do the same thing. Thoughts? TIA Ed

The manual doesn’t cover this. Is the thermostat 2.4 wi-fi only or allows 5gHz? Do the sensors connect to thermostat with bluetooth, or do they also need wi-fi network access?

I prefer the T9 to my 2020 google nest thermostat with the mirror finish. For some reason, I want a thermostat to default to highlighting the current room temperature. My nest shows you the set temp in bold font and the current room temp in much smaller font. No option to change. Nest’s much more expensive version gives the option of showing you the current temp briefly in their “farsight” feature (nice animation), but not on mine even though mine also has a proximity sensor that turns the screen on. Also, my screen is too dim to read in a darkened room and there’s no way to control this feature. At least with the Honeywell T5 (and I assume the T9) you could adjust the brightness, and the screen was always on so you could easily read the room temp even if you weren’t close to it. Finally, I like a touch screen over that touch strip on the 2020 nest. But with Eversource rebates, my nest only cost $1, while the T9 cost $69.

I don’t see how the sensors will work unless you have multiple blowers in your system

I have a Trane Furnace which basically has a multi speed fan and variable/multiple burn levels. and so it stays on longer and keeps the temperature very steady and gets a very steady circulation of air around the house and makes every corner of the house have the same temp. So the question is.... is there a compatible thermostat that i can connect to smart things or Google home for my Furnace?

I’ve noticed that ecobee doesn’t change presence for a full hour after you’ve left the room per chat with their support… does T9 adapt to presence changes more quickly?

I'm a little confused. I guess the room sensors are nice because it lets you know which room is under performing in temperature. But if you don't have mechanical dampers setup for temperature control on a forced air system then how does it regulate the air from room to room without a damper?

How do you regulate each room when everything is on a central system? What we really need is power vents in every room that way if one room gets to hot it can close down vents that don't need cooling or heating and allow the heat/air go to the room that's needs it.

Honeywell says our thermostats have always worked with a +-1 degree algorithm that will make them activate the heating and cooling based on your comfort.

Great review - which thermostat is quieter. I have non-smart one that 'clicks' really loudly, do these smart thermostats negate that?

We have a duplex we converted to a single family home, so we have 2 furnace and 2 central air units. Should or could we use two ecobee, next or honeywlell? Or have 2 different because you can only run 1 on an app or can you run more than 1 ?

Careful if you have an asus ax11000 router. The T9 can't see the networks

Sorry, I am just not understanding the "Alexa, make the Living room 5 degrees warmer." feature of a smart thermostat. Am I missing something? I understand that having a sensor in each room tells the system the temp of those rooms, but how can the system control each room individually? All it can do is turn on/off the HVAC system which feeds the entire house together. There is no way to route heat/air to each room separately. So how does having sensors in each room matter when you can just say "turn the heat up 5 degrees."?

Is that why i didnt like the nest... The temp swing? Hmm Only problem with these room sensors is it basically still tries to cool the whole house to the temp of the room you are in. I wonder if these can work with a zoning system.

Is there any thermostat where the sensors are hardwired or plugged in to the wall so no need for batteries ?

I prefer Honeywell T9 over Nest but I got Honeywell Lyric T6 Pro, less expensive and it connect to Alexa as well.😊

I read your comparison of the echobee4 vs the Honeywell T9. The echobee main unit and the extra sensors are cheaper on Amazon than the Honeywells, which is contrary to the article. Would you still say the Honeywell is the overall winner?

how does these thermostats regulate air into specific rooms? If I want to have a room which in general is hot, can I set it at lower temperature and AC will only send cool air to that room more often? Do you need new hvac system too for these to work?

Does Honeywell make a wall plate for the T9 smart thermostat?

I have a Lennox HVAC system. It's a 4-wire proprietary system, so you cannot change out the thermostat with anything else. There is a way to rewire the compressor unit to accept a standard thermostat, but you lose all the program ability features to be able to change the RPM of the motors the airflow, low-level diagnostic, etc.

FYI, PSE&G has $100 rebate in NJ atm. :) Think as much as I want to go Nest, the T9 seems like it's more feature rich and control. #djrtnyc #chillout

Does that T9 have a fan circulation mode? I just got a 2020 nest thermostat and it does have it, such a disappointment So it's going back and I'm looking for t9, also wondering if a fan can be set on schedule like run from 4 to 7 pm every day and when normal circulation mode.

Is Honeywell T9 compatible and working with Home Assistant?

For sensors in different rooms and regulate different rooms you need thermostatic radiator knobs on each radiator otherwise this will not work... am I right?

I got a Honeywell RTH985WF does that sensor work? Or doesn't it have one that works? Thanks

I have spoken to nest! So disappointed. I’m in Scotland and the lowest temperature is the highest amongst competitors. Nest have the lowest temperatures at 9 degrees. Often in Scotland it will fall below 9 degrees whilst your sleeping. Nest keeps coming on which means your heating is on whilst your sleeping. Thousands have asked nest to lower this but they don’t care, we are just the customers. So if your someone who likes to have the heating going on and off and you live in a cold climate. This is not the one to choose.

Since Ecobee is not an option in Europe this looks promising. I use a SmartThings hub for my smart home, so integrations seems ok. That geofencing thing bothers me, though. I guess every family member should have the app running for it to work properly. Maybe you could explain this more in detail in another video?

Does the T9 depend on a web site to function, ie, can this be used in a cabin in the mountains with no internet access,but does have a local area network / wifi (and z-wave) networks?

I may go with Honeywell since I use Alexa

The reason I am upset with my new Honeywell is that it can't be set to have a dead band. I prefer the deadband, and I prefer to be able to set it where I want. My aging lux could do that, but it doesn't have a shiny app. So why is it my old one can, and these newer ones can't be programmed?

I have the Honeywell T5 and it has the ability to customize the Honeywell ISU #s such as ISU 303 (Auto-Changeover Differential) using Device Setup (a 6 sec press of the Menu button). Does anyone know if the T9 also supports this level of customization?

How does the T9 control the temperature for a single room? I understand there are sensors you can place in different rooms, but won't it just turn the AC or heat on for the whole house?

Do you know if any of these options work to make a heat pump and wood pellet stove work with a smart thermostat? We're in a unique set up that no one seems to know the answer.

I'm assuming you just have one zone in your home? We have 2 HVAC systems, and I'm curious if they setup the app to have multiple thermostats work with assigned sensors this way.

In a two story home it is always hotter upstairs. If i set the sensor upstairs to 70 degrees will that make downstairs much colder?

okay and that's another question the sensors how does that work with the heating and cooling do you have active dampeners up in the attic that open and close the rooms you don't go into that

How about t5+ ?

Why they do not add « connected thermostatic head » like Tado so you can properly change temperature of each room instead of boiling all the house only to heat up the Family room.. ?! Strange that there is only one brand doing that very smart stuff..

So the T9 can cool certain rooms more than others? How does that work? I'm confused.

Why can't you say OK G... or hey Al... what's the room temperature??

honeywell isn't a small company but its probably better to support the "smaller" player since google will just vacuum up all the data from everything screw that. I wonder what honeywell's policy is with user data

I have the T10, Im having wifi issues. It connects, Then disconnects. I had an older Honeywell and never had connection issues. #2. How the heck are you putting those sensors in the kitchen and setting temperature at 76 to cool down more the kitchen yet The air ducks are all the same coming from one place. impossible to cool down more then kitchen then a master bedroom or a bathroom. Its all one duck.

good info. TURN OFF the background music.

How to get it cold

How does zoning work with these smart sensors??

T9 imo.

Love Honeywell thermostats, but unfortunately Google Home cloud Integration is unreliable.

I agrre with the nest way of cooling you need a range otherwise your system is just going to cycle on off continuously that also is going to cost more money besides wear and treat. It's like this good forsaken eco modes on the window ac units. On off on off it takes alot of energy to have the compressor cycle on and off like that.

I prefer my Ecobee 3

My T9 doesn't show the Cool setting

A bit unrelated but I have the nest thermostat and can't figure out how to integrate it with my smart things... can anyone help?

So you are saying there is no way to customize the amount of swing on either the Nest or the T9? If so, that's quite an oversight on their part. Ecobee let's you customize the precise about of swing you want by half degree increments. While nest is right that less frequent activations puts less wear on your system, thats a large swing, and T9 keeping temp precisely is nice but bad for wear and the electric bills. Ecobee let's you choose a happy compromise of your choice. Even my old $70 2005 thermostat let me set the amount of swing and I wouldnt even consider one without it.

I used to use T9 on my Nextel for texting. 🤓

Honeywell1 The support to Nest is becoming obsolete!

How does the T9 keep one room at a given temp and another room at a different temp without the use of physical zoning?

The whole prioritizing a one room of over simply won't work unless you have a system set up to handle something like that. Telling it to prioritize one room over another will only create hot and cold zones, more so than normal.

Why does no one talk about the T6?!

NOT The same Honeywell that made, uh, fire alarms, and uh, honey? I'm sorry, they same honywell. My bad.

why Why WHY don't they make remote temp sensors that plug directly into a wall socket. I hate having to worry about batteries and contribute to nasty chemical e-waste by constantly having to replace single use batteries.

Is that a really good thermostat cuz I have one of the regular ones and it is garbage. I think a five year old Chinese boy could do better. The emergency he gets all confused . It always wants a reset itself . it always want to go in programming mode and I turn the programming mode off. Also this is a brand new brand new system. Thermostats sucks ass . Sounds that more expensive version any better or no