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Thermostat questions
(partizle.com)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
+1 for the T6, I have one that was a perfect drop-in replacement for my previous Honeywell thermostat. The only bit of fiddling I had to do was enabling Auto Heat/Cool mode in the ZwaveJS2MQTT dashboard.
I'd also recommend the SimpleThermostat Lovelace card, it's much more customizable than the default card.