I have it set up fine?

I ended up picking up two of the Home Assistant Voice PE devices and I've been fairly happy with them. I even extended their firmware so I have a clock display on each with one being my bedroom alarm clock even. But even out of the box functionality, as long as you can either run faster-whisper on Home Assistant (or another box), or don't mind their lighter device-control-only route, is totally solid.

Plus music streaming to them (with an external speaker attached via the 3.5mm jack) is pretty good!

Get an ESP32, a temperature sensor, and 4x relay board and build your own with esphome!

If you pull the instructions for your thermostat, the wiring guide should tell you what each wire is for (because you can't trust wire colors). From there it's just wiring up the relays properly, getting the config built in esphome, and setting up a generic thermostat.

It sounds kinda daunting, but it's really not super complex. The only gotchas too look out for are any of the relays that can't be on when another relay is on. There's a way to prevent that in esphome. I'm sure someone has made a guide on it by now. I would have made one if I had gotten my enclosure figured out before my 3D printer took a hiatus.

https://github.com/justLV/onju-voice