T9 WiFi Smart Thermostat with 1 Smart Room Sensor, Touchscreen Display, White

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 thermometerIn 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.

I’ve tried a few popular thermostats like Nest, Ecobee, also the Amazon thermostat. So far I like this one the best. I’ve paired it with HomeKit which I believe is the key. I’ve learned that integrating my smart devices with HomeKit makes them function more efficiently. I also have an Apple HomePod, which has a built-in climate sensor. The sensor on the Apple HomePod is very accurate and helps the Honeywell T9 control temperature better. This Honeywell thermostat also comes with a great sensor. I live in a four-bedroom two-story house. I’m using this thermostat upstairs in the master bedroom and the Honeywell sensor is in the fourth bedroom across the house. The upstairs temperature is perfect. The thermostat I was using previously was not so great. It didn’t work with HomeKit and it didn’t have any sensors. So sometimes the AC would stay on too long or the AC would not come on when it should. I was constantly modifying the thermostat. I no longer have that problem since I purchased the Honeywell T9 thermostat. Now the indoor air upstairs is so comfortable, even at night. Even at high heat temperatures in the hundreds. I have no problems with it staying connected to WiFi. I’m currently using the Amazon thermostat downstairs, but I will also be replacing it with the Honeywell T9. Honeywell T9 has many functions and is easy to use. It was basically simple to install. The house already came with Honeywell thermostats so all I did was pulled off the previous one and popped on this one. I love having the ability to control the thermostat remotely from my phone, by voice with Siri, or Alexa. As long as you install this thermostat correctly and use sensors correctly, you shouldn’t have any issues. During installation, initially a message appeared that said, “factory test failure”. On the touchscreen of the thermostat below that message, if you touch the lower area of the screen, a menu will appear which will allow you to start the programming of the thermostat. Simple!

It was very easy to install and I LOVE the sensor that allows you to base heating and cooling off the active room in the house. The controls are easy and the thermostat looks nice on the wall. I love the color coding. The screen turns a muted orange when heating and blue when cooling. It's gray when holding temperate. It's nice because you can see from a distance if your system is running. It works very well!