I was wondering about this thermostat because you can get additional temp sensors for more room's, do these just let you know what the room temp is our is there something else that you can get to help regulate the individual room temps, I saw duct work vent's at lowes that I presume either open or close or change the air flow direction Ill look this morning when I go by there
Without automated opening/closing duct lines I don't see it doing much to keep all the rooms the same. I have a 2 story house and keep the thermostat set at 73 degree 24/7, whether I'm home or not. The upstairs is about 69-70. What's funny is that the upstairs is actually warmer when the outside temp is below zero, as the furnace runs more often than it does when the outside temp is in the 20s and 30s.
I was told the separate sensor upstairs would cause it to kick on and move air around to try to regulate the temp better. Not sure that it does that though. It probably works better with a forced air system running only on gas or propane, as it can just blow the air around. But with a plenum in the way with hot water all the time, it'd just keep sending hot air.
I like the ecobee mainly for the access to it from my phone during the summer. I can turn the thermostat down to 68 when I'm on my way back from out of town so the house is nice and cold when I arrive.