Best way to turn on and off a fan

#1

What’s the best/appropriate/most awesome way to use webCoRE to turn on and off a fan based on an expression? When my upstairs is more than x degrees warmer than my main floor, I want to turn on the furnace fan to equalize the temperature. But then when it gets closer (not equal; it’ll never be equal), I want to set the fan back to auto. I’ve got a few ideas, but I’m not sure what the “webCoRE way” is.

Thanks

#2

I would make one IF condition and make it an Expression using the blue drop-down box:

IF
[Temperature Sensor : temperature] - [Thermostat : Temperature]
is greater than 4 (or whatever delta you want to trigger the fan to come on)
THEN
Set thermostat/furnace fan to ON
ELSE
Set thermostat/furnace to Auto

Edit to add picture:

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#3

That would depend on your thermostat and the dth that you are using and whether your furnace allows for independent fan control.

#4

That’s exactly what I wanted. Thank you!