I really tried to make my less than a year old Nest systems work. My HVAC folks couldn't even get it to link to the App and their online customer service was awful. So far I have found that the T6 was easy to install, you don't have to be an engineer to get it to work, and the best part - it's mostly intuitive. It was so easy to learn to use that I have never had to contact their customer service folks.
For 3 years this thermostat has worked easily and with no problems. After an internet change I was locked out of access to the thermostat. I called the Resideo Support number and had a wonderful and productive experience with the rep who guided me to an easy resolution.
This is the 4th type of Honeywell thermostat that I have had and as with all previous ones the temperature is off by 2 degrees with no real way to add an offset to correct for the reading. I wish someone at Honeywell would read these reviews and actually change something for a change to make it easier for the end user to change things.
Response from resideo.comBy Joey, Support, February 6, 2023
Hi, this model does have a indoor offset setting that can be adjusted from the installer menu. You'll want to get in touch with us to adjust this setting, you can find all the ways to contact us on the top of this page.