I purchased the device a few years ago, but did not install it right away. After replacing our HVAC unit, we had to pull new wiring for the thermostat anyway, so installed this one. It has performed nicely. I wanted a remote sensor as well. I bought 2 newer ones that were incompatible before learning it needs the older technology.
diy install was fairly easy. tstat works as promoted. app interface was easy to connect and works as described. imo, only drawback on this tstat is that there’s not a way to adjust temp variance. once a temp is chosen, furnace turns on often to keep the temp exactly at the chosen temp, rather than float a bit ( +/- 2 or 3 degrees) prior to calling for service again.
I wanted a thermostat that I could adjust via an Internet connection. After a lot of research on line, I bought the T9. I installed it myself, which was easy. The instructions were clear and easy to understand. I highly recommend this product.
Our local church HVAC was controlled with 6 Honeywell T7300 stats. They served there time but we needed to update the system so it could be controlled remotely and help with last minute schedule changes. The new T9s were installed with remote sensors and everything went smoothly. So far they are performing as expected.
So far, so good. I had a HVAC tech install it and it's working like a charm. It's easy to use and we know the house temperature from anywhere, which is great for when we travel. I would recommend this product over the Google Nest, which is more expensive.