I bought two Honeywell T6 PRO Z-wave thermostats (NOT the WiFi version, the Z-wave version). I read somewhere that it “works with SmartThings”.
But it was not listed in the supported devices. I was able to add it as a Z-wave device. I can see the temperature reading, I can change modes, and set heat and cool temperatures – all manually.
However, there is no longer an “auto” mode to switch between heating and cooling. That should be easy enough to automate, so I created automations to switch modes. However, the automations do not work for me.
So, searching here for “TH6320ZW2003” led me to this topic:
[RELEASE] Enhanced Z-Wave Thermostat Device Handler with Z-Wave Plus
So now I see that apparently, my thermostat requires a custom device handler (not supported by Samsung/SmartThings, but by the “community”. That’s a disappointment, but OK.
Following the instructions there, I’m taken to a page that requires a login. Then I find that that it requires a “Personal License” – to the tune of $39 (is that once, or yearly?). I’m all for supporting developers, if the software is what I need – but I suspect this may be overkill for my needs.
So is that the only way to make this thermostat work?