Whole House Fan (Switch)

This SmartApp concept is great and should solve many of problems, but is it possible to control the house blower fan (on/off) through the Ecobee3, rather than requiring a z-wave switch installed directly at the whole house fan?

I feel like I might be missing something here. The Ecobee3 ST device controller allows toggling the blower fan to on and back to auto. Works fantastic. Is it possible to then just somehow tap directly into that feature when controling what (inside/outside temp gradient) kicks the the blower on?

That’s certainly possible, but this SmartApp won’t do that. You could probably configure something like that using WebCoRE

I have webcore monitor temps on different floors. If the temperature variance is greater than a certain value, it switches the Ecobee to Fan On. Pretty easy to do in WebCore and works great.