I agree, I got the thermostat for Christmas and two sensors... I just got the UV light for my ductwork today and will install it tomorrow. I have been watching videos on the Honeywell Home products and I am pretty excited to have them in my home. I will know more once I see how well it learns my routines. So far I love the look and the house is comfortable.

Awesome video, got the answers on my questions! Thank you

Excellent overview. Thanks

Hi Tim, that is correct. The T9 needs a 24 volt C wire for power. If that wire doesn't provide power then the T9 won't on. -Jim

Can a T9 downstairs with sensors throughout the entire house work with a T6 upstairs? I’m not trying to replace both thermostats since they work fine.

Sad i can find information on the features in the app as for data logging.

So I just purchased the T9 today and I removed my old one and installed the T9 but it does not come on. If the Blue C wire is maybe not connected up in the attic would this prevent the thermostat to not activate? I reinstalled my old one and it works HELP Please

For Heat Pump systems with backup heat. What logic does the T9 use to kick on the AUX heat source? I want to be able to configure this so the AUX heat doesn't kick on as long as the outdoor temperature is above a certain point. I know there is an AUX Threshold setting on the Ecobee units. But don't see it on my T9.

Do you need zoning in the home for the thermostat to be able to target the one room that needs to be heated/cooled? If it just blows a higher average to get the room to the desired temperature, would it just make the other rooms on that floor hotter/colder? We are having a new system installed and getting the T10 and one sensor for a cold/hotter room. We do not currently have a zoning system installed. So I am trying to understand how the sensor actually works. Thanks!

I want to replace the 2006-era thermostat for our geothermal heat pump to be able to adjust the programming with an app to avoid always needing to go through the awkward multi-step manual process on the thermostat panel. However, I have not been able to find details about whether the app allows me to save different heat/cool programs so they can be implemented to replace the current schedule. For example, if I create a set of heat/cool times for when we are away, I'd like to be able to apply them by just opening the saved set - and then be able to remotely restore the "normal" settings to be in effect when we arrive home. The videos all seem to imply that changing the programming needs to be done the same way on the app and the thermostat screen, but that doesn't seem very useful.

Which would be the recommended setup for a two levels house having two independent heating/ cooling systems (currently one thermostat per level)? It would be nice to see every room of the house on the same thermostat or, at least, on the same app page..

I own two of these. I haven't been able to get mine connected back to my wifi after resetting my router over a month ago. Customer service has been difficult to get a hold of via phone, and they have stopped responding to my emails. Very frustrating.

Hi, does Honeywell RTH985WF works with the room sensor?

I have an existing digital wi-fi thermostat that uses a battery pack and it has a Green, Red, Yellow, and White wires connected to Y1, W1, RC, and G with a Blue wire that isn't connected to anything. This is a York central AC system with a Gas furnace. What honeywell thermostat is compatible? I purchased 2 T5s but they won't power on when wired according to the instructions. Will the T9 work?

I have a zoned system and would like to have one T9 control my motorized damper. How can I set my T9 with various room sensors to direct heating/cooling to the desired room?

I have old honeywell noo-smart thermostat. Reason I am changing is my basement is cold always but upstair is hot enough. Can I place sensor in basement and thermostat upstair?will it pair and keep basement warm in winters?I dont have a big house

some question for ya on this tstat and our system. we recently had a new 2 stage heating and cooling system installed in our older home. same york system as the older 25+ year old units. we have this tstat, and we enjoy the features it has, but it seems to run forever. we were told with cooling not to drop the temps further then 2 degrees from desired or it will run longer. i have ours set to cool to 75 for specific times, then raise to 77 like when not home for specific times. when home and it calls for ac to run, it only takes maybe 15 mins to get to desired temp, but never shuts down for like 30-40 mins. then once it shuts off, it kicks back on in 5-7 mins. it does this all evening long. so our first elect bill was really high. to me this seems something is not right. why does it run for so long after desired temp is met. it just sits there and runs when its showing the desired temp. any advice would be great. thanks

Can this be used for my Mitsubishi heavy industries ducted cooling/heating?

I have this in a new home I’m buying. How do I know that my ac system is compatible with this thermostat and actually does work with selecting rooms. Don’t I need a dampener ac system to ensure this works correctly? Sorry if I’m not fully making sense, this is all new to me

Can the T9 control the dehumidify mode on my AC Unit?

So to turn off and on the air system I have to press the three bars at the bottom, then mode, then off? There’s no way to do that from the main screen?

Can I use this if I have 2 thermostats in my house (1 upstairs and 1 downstairs)?

I just installed the T9 successfully except I can’t get the sensor to pair with the thermostat. I’m getting a “Can’t enter enroll mode” error message on the display. Any suggestions on how to fix? Thank you

What is the minimum heat set point that this unit can be lowered to?

My geofencing continues to override our schedule we set up when we first installed the thermostat. Our schedule is no longer working. I’ve tried to disable the geofencing and even deleted the app but the scheduling functionality is not working.

My existing thermostat and return air are near our carport door. My heater or AC kick on whenever the door is opened. Would putting the T-9’s remote sensor in our family room eliminate the main thermostat from turning on our system everytime anyone opens the carport door?

Why I don't have options for cooling? On T9 termostat. Here shows "auto, cool, heat, off" I have only heat and off???

My thermostat does not find my WiFi. Why is it not locating my WiFi?

Wish I can quickly display, or see on my app, the current temperature in the room where the sensor is. Also I have to run two apps, the Honeywell home app for the T9, and the TCC App for my WiFi model 9000 thermostat. Customer support said they are working to combine the two. Regarding the extra room sensor, it is supposed to detect activity and adjust the temperature in that room. But I found that after we go to bed, there is no movement in that room rest of the night, and the thermostat seems to think there is no one there so it takes that room off its active list! What do you want us to do, jump around like monkeys in bed all night to keep the thermostat sensor active??? :) :) :)

This is a capable thermostat, and overall I like it. But it could be SO much more useful with just a few tweaks to enhance data reporting. The Android app would be much better for using, optimizing, and troubleshooting the heating system if it (the app) reported the "Equipment Status" screen so users could see what stage the furnace or AC compressor was running. The RUNTIME reporting in the app is pretty lame, giving only a total time for heat or AC, and even that takes about 48 hours to show up. (i.e. I can't use the T9 or its android app to see how long the furnace ran in stage-1 to heat the house this morning. Run-times take two days+ to show up, and one only gets total time in a given day for heat and cooling runtimes. No breakout by number of on-off cycles by time of day like the Google Nest provides. LASTLY - The Honeywell / Residio T9 and T10 documentation is completely silent on how these units handle two-stage heating. There are no user-configurable settings in these T-stats for when to kick up "low-heat" to "high-heat" for instance. So my T9 kept my furnace running for nearly two hours this morning (on the low stage 1) to raise the temperature One degree F. Had it kicked to hi-heat stage 2, the furnace would've been done in 15 minutes.

Humidifier settings?

It's locked, I touch the screen and it doesn't do anything, it's locked, how to unlock it

Poor design. Can't set time