With all the hot deals popping up now, I would wanna know the Halocha on the Nest Learning Thermostat
I installed my thermostat (bought from lowes for $134 after tax), there is an option to disable wakeup on approach, this means that nothing physical will happen when you go near the device, it could be that it learns your activity, but since it's not set to turn on and off based on activity there shouldn't be a problem in regards to Shabbos, there is an option of 7 day timer that sets the temperature (not on/off)