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ecobee works locally (without its cloud services) through Apple HomeKit.

I have an ecobee. Quite nice and easy to program on the panel itself if you choose not to connect it to your wifi at all.

One oddity with my ecobee - if it's not connected to wifi, the clock runs fast. Sometimes gaining a whole minute every few days.

Cheap oscillator because they expect it to be network connected and be corrected by NTP. Why put in a good clock when a cheap one will do?