@dbemowsk Your mancave project sounds EXACTLY like my setup. Two thermostats at quite a distance, fan (powerbar actually) gets powered when temps are <> a few degrees.

I'm not sure about the other questions. not sure what a node or controller is. I don't care how it works, really.

This was a mockup I had made back when I thought that arduino was the right way to go, but it seems there are all in one solutions (like the sonoff, except it lacks the extra sensor port) that will do it better.

http://i.imgur.com/wmSRTJG.png

I'm pretty open book about this project. I'm ready to buy whatever someone tells me to buy, as long as it's going to work, and will be somewhat reliable so I can stick it in the attic and forget about it.

I have a 120v fan (under 2Amp) that I need to be turned on and off via temperature, basically if TempA is 10deg higher than TempB, then turn the fan on. Once on, keep it on until the temps are equal.

Someone recomended the Sonoff TH for this, but it looks like it only has a single sensor port, whereas I need to compare 2 temps to decide if the fan is to turn on or not.

Can someone recomend another all in one solution? I need to put this rig up in an attic, so I kinda like the idea of something that comes in a retail-like case, and the WIFI was a definite bonus so I can hopefully mess with it without having to climb into my attic.

Thanks!