I have a single HVAC system with 2 zones.
The upstairs zone controls 2 bedrooms, with the thermostat in one of them.
Because of the location of the rooms, either one is too warm or too cold.
I thought the best way to fix this would be to duct a pass through between the rooms with a fan.
However I'd like it to be automatic. That is, I'd like the system to turn on if there's some temperature difference between the rooms.
Is there some "differential" thermostat that could be mounted in the two rooms that would allow the fan to turn on when there's a temperature difference?
Can anyone suggest a solution? Since it's not needed, I would prefer that the main HVAC system not turn on to equalize the two rooms.