Honeywell Home T9 WIFI Smart Thermostat, Smart Room Sensor Ready, Touchscreen Display, Alexa and Google Assist

Works great with the app and supports remote sensors
If you have never used a thermostat with remote sensors, you really don’t know what you are missing. It is great being able to place sensors inside of rooms instead of having to hope that your hallway is the right temperature. That really only leaves two choices of thermostats, the Honeywell T9/T10 or Ecobee.We recently moved into a brand new house with two separate HVAC systems, one for the main level and basement, one for the top floor with the bedrooms. The builder pre-installed Honeywell T6 thermostats, which left a lot to be desired. They worked well with the Ring system that came with the house, but that control is limited to the mode and temperature. You either need to use the touchscreen on the thermostat or the app to make the most of it. Due to the way the T6 was installed in contractor mode, I could not get them to connect to the Resideo app. The T6 also does not support remote thermostats, which really is a game changer.There are a couple of differences with the T6 compared to T9. T6 has battery backup (I don’t really care as long as it doesn’t lose its programming). T6 connects to Z-Wave, which makes using it with a security system easier (plus Ring only supports two thermostats if they are connected to Z-Wave). Both connect to wifi and both should work with the Resideo app, but I could not get the T6 into the right mode to set it up. T9 has remote thermostats, T6 does not.I wanted more control so I decided to upgrade to the T9. The best part is that it was literally plug and play. I removed the T6 and plugged the T9 into the same wall adapter. I was able to immediately connect it to the Resideo app, which is really what I wanted. The Resideo app is actually not bad, it gives me full control over both thermostats.We have purchased additional remote sensors and have two for each thermostat, I really like being able to place them in bedrooms since we usually have our doors closed. I work from home and have one sensor in my office, one in our living room. I did find that occupancy detection doesn’t work as well as I had hoped because I use a space heater in hopes of saving money and that means the office is warmer than the rest of the house. In the summer and on weekends it works a lot better.With the Resideo app you can easily tweak the settings from anywhere and you can program each day individually. If days match it groups them, but they don’t have an easy way to remove customization for a day. That is nice because I try to go into the office one day a week. I wish I could program heating vs. cooling different for things like the fan because in the winter I want it set to circulate upstairs, in the summer I want the fan off on the top level during the day so I’m not moving the hot air around as much (those vents are in the ceiling), in the winter I want more air circulation.In my previous house we had installed an Ecobee 3, the first model with Apple HomeKit support (which we never used). The Honeywell T9 is competitive with the Ecobee in most of the features you will actually use, but that Ecobee had a couple of features the T9 does not. First, Ecobee supports accessories, for example, you could use it to control a whole house humidifier (I wanted one but never bought one). T9 doesn’t do that. Second, Ecobee can use occupancy to control whether your house is in home or away mode, which would be useful for our top level since nobody is in the bedrooms during the day. T9 uses geofencing, which has a lot of disadvantages in comparison (everybody needs it on your phone, cannot distinguish between home and on that level). Newer Ecobee models add even more sensors and even Alexa. Ecobee also lets you tweak how often the fan runs, Honeywell just has circulate, which runs on their schedule.Ecobee also looks more premium than Honeywell. The T9 is functional but not as modern of a design. Their sensors are large white blocks that really stand out when mounted on a wall. Considering all of the white Ring products I have, it kind of fits in, though.I probably would have chosen Ecobee over T9 if the price was similar, but Ecobee is nearly double the price and their remote sensors are more expensive as well.

Extremely easy to install, works with combined 2.4 and 5Ghz wifi networks with simple trick
Our home came with a “dumb” T6 thermostat. But being a newer Honeywell thermostat model, the backplate is the exact same as the one that came with this thermostat. So installation was literally pull the old face panel off, and snap this one on there, plug and play, 30 seconds job.Setup was incredibly easy too, the step by step setup on the screen is pretty intuitive. There were a lot of reviews saying if you have a mesh WiFi, or any system that’s got the 2.4Ghz and 5Ghz band combined it would not work, and that worried me at first, because I want to have my device under one SSID, and I have several APs on my network.But the solution to that is actually very simple, I just found a old network extender, set the extender to connect to my home network, where it can read and connect to my main combined band WiFi, and then ask it to broadcast the extension network in 2.4Ghz mode only, under a different SSID. I then connect the thermostat to that extended network, and problem solved! It is still managed by the DHCP server on my main network, the thermostat never drops offline, and I keep my combined 2.4Ghz+5Ghz single SSID setup for the main WiFi. I used it like this for about a month now and had zero issues with connectivity. I agree this should not even be a problem to begin with in this day and age, but this workaround took me less than 10 minutes to get setup and running, and half the time was trying to reset my old network extender to factory settings…I did notice the humidity sensor is a bit off though, it reads high by about 10% compared to my other humidity sensors in the house, and those 3 are all in agreement +-2%. And it’s not just the thermostat itself, I bought a separate room sensor for it afterwards, and that ones reads about 10% high too, so maybe it’s just how they are calibrated by Honeywell? But anyways, that’s not the reason why I got it to begin with so it doesn’t matter much to me. Overall very happy about the thermostat, the only show stopper that worried me initially was the WiFi situation, and that turned out to not be a problem at all.

J’ai été plus d’un mois sans être capable d’enregistrer mon thermostat dans l’application Honeywell Home App.J’ai contacté le soutien technique d’honeywell home par téléphone et par messagerie instantané. Réponse rapide et très courtois et ils ne niaisent pas avec les détails d’usage. Cependant ils n’ont pas été en mesure de trouver le problème et il m’ont suggérer d’effectuer un retour/échange.Dans une ultime tentative de dernier recours, j’ai effectuer une 4e fois une remise a l’état d’usine et cette fois j’ai choisi l’anglais comme language de configuration. Je ne sais pas si c’est vraiment ce qui a fait fonctionné le couplage avec mon application, mais cette fois ça fonctionné donc si vous avez le même problème que moi essayez ça.

This thermostat is not able to control the fan speed if the AC unit. Two options only: either off or full speed. Very inconvenient.