Did a bit more research and confirmed yet another suspicion...
The internal relays are rated 10A @ 250V which means at 120V, they should be rated closer to 20A... They are stamped 15A, so plenty for a 12A startup spike.
OK, so BrewCityBaller echoed my own assumptions... I'm going to give the STC-1000 a go without using an external relay.
So, I had thought about a few options for wiring this controller in...
Standalone install built into a project box
Wire it inline with the existing power cord and a...
My freezer runs at 1.7A but has a startup rating of 12A. I know that the STC-1000 is rated at 10A but I've read elsewhere that the internal relays are rated to 15A.
So, do I cross my fingers and try the controller? Or do I go ahead and design in a relay? Here's the one I'm looking at...