This is a super quick “because the official docs didn’t make it super clear so here’s what ended up working for me” post. After some very disappointing WiFi connectivity issues, I settled on a Zwave based thermostat to replace the Venstar thermostat. After installing the Honeywell TH6320 and connecting it to the ZwaveJS gateway, a new `climate`` entity appeared in Home Assistant. From there, I was able to see/control: The current thermostat setpoint/mode The current air temp and humidity The current battery level / if the thermostat thought the battery was low I knew that it was possible to adjust the the screen backlight from the thermostat itself so I was a bit confused when there was no such configuration entity exposed in Home Assistant.

Info As of 2022-05-11, there is an update on my experience with the thermostat below! This is another one of those posts from my never ending quest to integrate Home Assistant with All The Things! The thermostat that was installed when I moved in was an early Nest thermostat. These thermostats are - for the most part - well reviewed and liked. I had no complaints… except one. Google only permits programmatic interaction with Nest devices through their Smart Device Management API.