When hass is connected to the EcoBee does it require internet or is everything done locally?
I think all of these use an external API. I could be wrong but I think it requires Internet.
The integration uses ecobee’s API so yes Internet is required.
Hass connects to the Ecobee through the Internet. It requires Ecobee’s API to send commands to your WiFi/Internet enabled thermostat. I also confirmed this by disconnecting my cable modem temporary and Hass could no longer communicate with my thermostat.
OK. Thank you everyone.