I am googling left and right after some comments from @Covert Rain about his smart thermostat but not having a ton of luck. Does anyone know some good links to information on how this works, especially and specifically for 2 story AZ homes? I am curious of things like: 1) If I add motion sensors to the bedrooms, it seems it would mostly ignore the bedrooms until you go in there and focus on cooling the rest of the house which could possible reduce my HVAC use. But then, lets say everyone is in bedrooms, is it now cranking overdrive trying to cool upstairs? It seems like it could save me money but could also cost me more based on what it is monitoring. Also, if you are sleeping and sleeping still, do the motion sensors not realize you are there after 30 minutes? What about if you just go in the room for 5 minutes and head back downstairs? It would just stop worrying about that room? 2) There are two teenagers in my house that work different schedules every day so it would not be able to "learn a schedule" and stop using AC when we arent home based on that, would the sensors be enough to do that? 3) honestly I am less interested in motion activation than I am in just getting the HVAC to work less often because it knows temperatures for the whole house instead of just where the thermostat is. At the same time, I imagine this could raise my cooling bill because now the house knows the upstairs is hot where right now it does not.