I ended up finding the CENTRALITE PEARL THERMOSTAT 3157100 used on eBay for about $30. It can either operate from the panel or through ZigBee, no WiFi. It is supported on Zigbee2MQTT. It works really great and I have had no problems with it. You can easily find a manual for it online too.
There is a z-wave version of that thermostat with the same form factor and clicks right into the same bracket: https://a.co/d/03PLsNtX I have it and it works as you’d expect.
Hmm okay. I've got ZigBee, maybe I'll start with z-wave too
I’m pretty sure Honeywell has a WiFi version as well. The Lyric T6 i think. It also uses the same bracket and if you bring it in to HA with the HomeKit integration you can block it’s access to the internet and it is fully local and considered offline to Honeywell
This is what I did. Added Z-wave radio for this. The thermostat works fine.
Is there a ZigBee alternative? Is there a "dumb" thermostat that doesn't connect to anything and can just be programmed on the device itself but has schedules and hot/cold setting
There’s a couple zigbee thermostats on Amazon if you search that. None that i have used personally so I don’t have any recommendations. There is a super cheap Tuya one, but i haven’t had a ton of luck with Tuya zigbee devices being very good. YMMV
I've got a 80$ ZigBee centralite pearl thermostat. Took a bit to setup automations for it but its been rock solid
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