[Richard]

I do have two relays just like in your picture. I am curious as to what they do also. I got caught up in another project today, and did not fiddle with the AH.

Here is what I do know. I have four thermostats for heat. One at the passenger seat, one in the half bath, one in the bedroom, and one in the bath. The one at the passenger seat turns on the fans under the couch and kitchen toe kick. The one in the half bath powers a fan in the half bath. The one in the bedroom, a fan in a kick plate in the bedroom. And naturally, the one in the bath powers a fan in the bath.

Here is where it gets a little murky for me. There are four thermostats, four fans, and three pumps. I will suss out which pump runs off which tstats tomorrow.

I will also get some voltage readings on the cubes in different states of Tstat activation.

My sofa fan and my kitchen toe kick fan activate and deactivate together.