@digitalcircuit I just saw this. For some reason your response ended up in my promotions folder which I never check. I’m not sure if you got an answer but I can answer your question about the ceiling fans as I have noticed that too. The thermostat makes some internal heat and ecobee has a patent out about compensating for that internal heat in order to read the correct temperature. I forgot how they do it. If you are blowing air past the thermostat, it removes some of that internal heat and the internal compensation does not account for airflow. As a result, it makes the thermostat read the temperature lower than it actually is. I have notice this occur with both my ecobee thermostats as both of them are located in rooms with ceiling fans.
Let me know if you make any more discoveries. The only recent discovery I have made with automatic staging is it also seems to know the slope at which the cooling or heating will change the temperature in degrees per hour. Similar to Beestat however my guess is that it is only maybe a short term average. It seemed to adjust over a few days when I relocated one of my thermostats. Anyway if the slope of cooling is greater than a certain rate, it assumes that it will overshoot the setpoint and therefore it changes the differential back to 0.5. Eventually if it is in the 50’s outside, it will change my differential to 1 degree because it must think the AC will cool the upstairs zone down so fast it will overshoot the setpoint and thus it increases the differential. So if it’s cold outside, differential in cooling will be 1 degree. Somewhat cold is 0.5 degrees. 70’s to 80’s outside seems to operate at 0.1 differential because it seems to know the zone wont warm up that fast. When the temperature is in the mid 80’s outside, the upstairs zone seems to change to 0.5 degrees because it knows the zone will heat up too fast and cause short cycling. That of course is just the one thermostat. The downstairs behaves somewhat the same but those thresholds are shifted because the downstairs cools faster and warms up slower . All that is without the “adjust temperature for humidty” turned on. If I turn that on, it becomes 5 minutes on and 7 minutes off and 5 minutes on…I can’t really use automatic staging with the “adjust temperature for humidity” feature.
Brian