Honeywell Home T9 Smart Room Sensor White Wi-Fi Thermostat + Additional Room Sensor + 1500 MPR Allergen, Bacteria and Virus Filtrete Air Filter Single

Avoid Honeywell like the devil.

The t9 is a decent smart thermostat is some aspects. The app is a bit fussy, slow in refreshing, and freezes occasionally. I scolded Honeywell for having such problems with the app because I installed seventeen smart thermostats on our campus twelve years ago from another company that, even though was a nightmare to setup, worked flawlessly for many years. This thermostat is very easy to install and setup, but is a bit buggy. I told them to hire a cracker jack young techy to fix their app. But o...

Have this. Won't another Honeywell Product

Had a T9 and three sensors at my previous home and really like it. The capabilities met my needs so when I moved I bought another T9 and some sensors. All was great initially. A few months later I tried to purchase another sensor to add to my system and couldn't get it to pair. After an hour of troubleshooting and research I found the reason. Honeywell updated the sensors but failed to change the packaging or note on the box that this was an updated model. In fact, EVERYTHING is identical except...

A thermostat I can actually rave about.

I think this thermostat has the best written directions I've ever seen. I'm fairly critical of such thing, like "do this do that" and saving "But if you have x model" at the end of a long paragraph. Or inaccurate pictures of the t-stat screens, in this case. but it was a perfect set of instrucitons for installation of single stat and in several variatons. The stat itself is working perfectly, has a zillion features, and I also use the Resideo app. I didn't want every feature and it was possible...

Nice Thermostat, but check it before installation

I ordered three Honeywell T9 Thermostat and Room Sensor bundles for my church. The installation and setup process was fairly easy. I used the Resideo app to set them up and create schedules. However, I don’t like that I can’t choose my own PIN to restrict access to changing settings or adjusting the temperature. The app could use some improvement. When creating schedules, the changes I made didn’t appear immediately—I had to exit and reopen the app to see or confirm them. One of the units I re...

Great thermostat

Way better than the Nest. The app is better. Buyers should note this came with a c-wire adapter. You don’t need to buy one separately. I didn’t know that and bought one because it didn’t say it came with one so I ended up returning the extra one I bought. So as a heads up you can save the $30.

Temperature Overshoot When Heating

I have used T9 thermostats on my two Carrier HVAC units since 2020. Two issues: 1) On HVAC unit #1 there is a large temperature overshoot when heating. For example, assume the set point is 73 F. The temperature shows 73 F when I hear the furnace stop firing. But by the time the fan stops the temperature reaches 77- 78 F. I wish that there was a tuning parameter that I could adjust to make the furnace kick off a bit sooner so as to reduce the overshoot. The performance when cooling is reasonably...

Thermostat is fine, Selecting sensors is confusing

This is a generation 1 thermostat, additional sensors must be ordered directly from Honeywell. As far as I could determine there is no way to tell the generation from the packaging.

Good Thermostat, poor documentation

I like the T9 thermostat. Had lots of trouble loading the correct phone app. Is no longer Honeywell but 1 of 5 different Resideo apps. Finally found correct one only to find out that my thermostat had already been registered which prevented me from doing it. The online service (India) was helpful, de-registered thermostat and I got it working. I almost returned it to Lowes as I thought it was brand new.

Worst decision

App doesn't register the thermostat as advertised. trying to figure out if I'm more angry with Lowe's for selling it or Honeywell (don't they develop weapon systems for the US government?). Either way I have to return it tomorrow and do another evening install of a different thermostat.

Dropped connection to my system - and always on!

Out of the blue, four years after purchasing, the main unit stopped being connected the same way to our system and to the app. We used to have a "dual" option (for both heat and a/c) on the master unit. It could be set as "if the temperature reaches x, cool. If the temperature reaches y, heat." This was one of the things we LOVED about the thermostat. Having a two zoned home with TWO of these (a master and a "dependent" thermostat) it's important that they both function the same. This time ...