I use a zwave version with homeseer

I use a Honeywell Z-Wave thermostat with Home Assistant. All local and I not only do I have schedules based on time of day, but it also adjusts the temperature based on if people are home or not.

My thermostat is dumb and I like it that way

I have the ecobee 3 lite and I try to keep it off the cloud and connect through home kit to home assistant. It is exceptionally unreliable and disconnects all the time. It’s the only home kit device I have, everything else is zigbee. I don’t know if it’s an ecobee issue or a home assistant issue or maybe a router issue. The only thing that’s helped some is occasionally letting it have access to the cloud and then it will reconnect to home kit and then I can disconnect it from the cloud and it will be good for any more from a few days to a month. I cannot recommend it because it has been so unreliable, and looking through online forums I’ve seen a lot of other people have similar issues with HomeKit and the ecobee. Eventually I want to switch to a purely zigbee device, as this is the only thing I have that even has Wi-Fi on my automation network.

I then control temperatures through a combination of home assistant, node red, and sensors through zigbee2mqtt.

For baseboard heaters, I have the Sinopé line of ZigBee thermostats, with home-assistant on my home server. Baseboards are kind of particular in that you have one thermostat per room, so at 350+ for a Nest, it’d be cost-prohibitive as I have like 15 thermostats in the house. Also, they’re line voltage, meaning that they directly switch the full power of the heaters, so they need to be well made.

I’ve had my Sinopé thermostats for 2+ years now, and I’m very happy with them. No clouds involved here.