Even my ecobee thermostat does not require an internet connection.
https://support.ecobee.com/s/articles/Wi-Fi-FAQ-Setup-Guide-...
> The short answer is yes.
>Even without a Wi-Fi connection, your ecobee will still function as a traditional thermostat; it will engage your equipment as needed and maintain your comfort set points.
Even my ecobee thermostat does not require an internet connection.
https://support.ecobee.com/s/articles/Wi-Fi-FAQ-Setup-Guide-...
> The short answer is yes.
>Even without a Wi-Fi connection, your ecobee will still function as a traditional thermostat; it will engage your equipment as needed and maintain your comfort set points.