HoneywellHome THX321WFS2001W T10 Pro Smart Thermostat with RedLINK, White

12/6/2022 - Resideo was kind enough to honor my warranty request with the help of an independent HVAC contractor, as the T10 is a "Professional" model.So, the same thing started happening a few days into my replacement (new) T10 thermostat. Fortunately, I had done enough research, troubleshooting, and had a couple of cheap furnace parts on hand, and, fingers crossed, it may have been a flaky pressure switch on my inducer motor that was causing the issues. It was just a coincidence that changing out the original T10 for a basic non programmable t-stat "seemed" to cure the issue. Time will tell, but if this thing continues to work, it's fantastic, and hands down, better than Ecobee's latest 2022 Premium, IMO.5+ STARS---end of updateI really wanted to like this thermostat, as I have always had Honeywell t-stats in the past. I was warned that the T10 had to be installed by a "professional" in order to have ANY warranty whatsoever, whereas the T9 is approved for installation by the homeowner. Honestly, other than additional features, the installation process is virtually identical, so I don't understand this distinction. I ordered the unit in Sept of '22, and installed immediately. I wanted the T10, as I had also purchased a Honeywell HM750 whole house steam humidifier, and it is one of the few t-stats that can control a steam humidifier. Well, as summer transitioned into fall, the t-stat appeared to work great! However, once the temps dropped consistently enough to require full time heat setting, it began to fail. I honestly thought it was my furnace that was failing, as half the time, the ignitor and gas valve failed to activate, even though the inducer seemed to run fine. I was chasing down pressure switches, ignitors, and even the IFC main furnace board! No improvement. However, bypassing the T-stat at the IFC directly, the furnace ran fine! This was not a solution, as I couldn't sit in front of my furnace 24x7 to control it manually every day. Ultimately, I went to a local box store and bought the cheapest basic thermostat I could find, and plugged that in, and the system has been running great! Unfortunately, I can't control my fancy steam humidifier, and had to resort to using the included humidiPro. Through an independent HVAC specialist, who came out and assisted me in this project, I was able to ultimately get a replacement ticket initiated through Resideo, however, I am awaiting acknowledgement of the required attachments I sent them, verifying my purchase and the device info.Currently, I am using an Ecobee Premium. By comparison, I find it's app highly convoluted, and it takes considerable focus to find what I need. Also, there is no "circulate" function on the Ecobee, whereas there is on the T10. The Resideo app is by no means great, as it must be force closed to get the latest data from the T10 every time you make a change, but it's simple and concise to use. They just need to update it so it will refresh in the background, and not require a force close each time you pull it back up.Also, I prefer the functionality of the Honeywell remote sensors over the Ecobee sensors because the Honeywell pull both Temp AND Humidity, along with motion activity, whereas the Ecobee sensors do NOT pull humidity! I want both temperature AND humidity levels balanced! There is no reason for Ecobee to not include this in their remote sensors....I will update this review once I get some action on my RMA process.

I purchased this stat after considering all that were available. Mostly I wanted one which had some source for outdoor temperature, was adaptive to the length of time it took to reach temperatures, would allow for air circulation when not heating or cooling, and most of all - remote sensing.The remote sensors for the T10 (and T9) work on 900 mHz and are able to connect up to 200' away. I added three remote sensors, one in the master, one in the living area, and one in my home office, so necessary these days. I disabled the temp sensor on the stat itself - which was located in a hall near the HVAC system, but not where I spend time.The temperature probes use 2 easily replaceable AAA batteries, and are easy to set up. They hang on the wall via easily undone 3M tabs - so if you don't like where you put it, you can get more tabs at a local hardware outlet, and move them with little fuss.The result - a system which runs much more efficiently than it formerly did, the temperatures in the rooms that I occupy end up at the temps I want (not what the entry hall is at as previously). The circulate mode runs approximately 10 minutes out of 30 (1/3 of time) and evens out the temperature just due to circulation. And the stat is auto changeover, with zero offset capability (though I set mine to one degree apart) and so in the fall and spring when daytime needs cooling but night needs heat - the stat auto switches between modes.The T10 is designed for professional installation and has a LOT of options. The default from the factory does not work for a heat pump, and must be configured for it to work properly. The configuration itself is easy - but it really does require you have the manual. In addition to the system type (3 Heat / 2 Cool heat pump with gas backup) I was able to set compressor lockout, when each stage becomes active, a post operation extra run time of 30 seconds (other values possible), and numerous other parameters. Note that the T9 is essentially the same stat, but without all the possible flexible configuration.Wiring was simple - and everything, including an oversize plate and one remote sensor came in the box. I purchased separately two extra sensors - do make sure they are the "Red Link" and specifically T9 / T10 compatible.