"THE VAULT" - Temp Cntrl - Heat & Cool???

[okieRob]

Originally Posted by madwilliamflint

I'm not sure how to build the bridge between a low power DC digital circuit and something that's running on AC power. I'm not sure why it would be much more than a sufficiently high capacity relay though.

You are looking for a solid state relay. The coil side is made to run on a DC circuit but the switched side can handle AC juice. The one you are looking for should be in the $15 range or so.