Repeat after me. Never. Buy. Google. Hardware.
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Remember when a house would be built and a thermostat installed, and that thermostat would just work for 40+ years?
If your smart thing can’t survive without the cloud, it’s not a smart thing.
Unfortunately the number of smart thermostats that have a full local API is tiny.
This is why I learned Arduino and built my own damn thermostat.
This is all a simple thermostat is. A bimetal strip that causes a contact to open or close. That's all this thing does for a furnace, close/open the "be on" signal path.

Yeah and that's what was wired to my floor heater, but I wanted it hot in the morning, warm during the day, and off at night. They wanted $200 for a smart programmable thermostat, so I made my own for $20. And I can chart the temperatures over time, or reprogram it over wifi.
And it's still wired in series with that old bimetallic thermostat just in case my thermomstat and its watchdog chip both fail on.
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