I ended up ordering both the smaller current switch from the article @chad.andrews referred me to and the bigger one @aaiyar linked to. They should be here tomorrow.
In my install it would be best if I can put the relay in the box with the thermostat. The stat wires in this application are 120volt and they are low amps. Not sure how many but it only calls for 16awg wire in the manual so I know its below what the little one can handle. If that works well it puts my contact sensor WAY closer to my hub so that's plan A. If not the bigger one will be on hand. I am sure I can find a good use for whichever I don't end up using.
Thanks again to all of you. I will post my results.
(Is it wrong that I am super excited!!!)
