Allow fan options depending on differences in sensor readings.

So for houses that heat unevenly or have a fireplace/other type of single room heat, I think it would be great to be able to set a number that is a threshold value of the difference between the ecobee and sensor(s), and if the temperature difference exceeds this value, the fan is switched from Auto to On. This would help to keep homes evenly heated as well as prevent the heat from kicking on if the average between the two is below the thermostat setting causing the house to be heated with some rooms are still above the setting. I dont know much about coding but I thought this could be especially easy with IFTTT if there was a command for "if temperature difference is greater than __" then "house fan turns on."
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