I use a z-wave thermostat (Honeywell T6 IIRC). If you want to avoid the cloud WiFi probably isn’t what you want. I’d look at z-wave or zigbee models. Some thermostats also require a common wire (C-wire) which means they’re powered by the HVAC system itself rather than using batteries. This is especially true of WiFi models.
While this is interesting it wouldn't work for my needs, mostly because I'm not the one using the printer most of the time. I need something that can print on heavy card stock.