and for those that have Electric heat - they now have smart thermostats. Used to just be 24v which Nest and Ecobee take care of, but now they have come out with ones that work with high / "InLine" voltage (120v or 240v). Literally just ordered 8 Mysa's last week as they just launched their V2 in September and are having a Thanksgiving Sale.
For those that are interested:
https://getmysa.com/