I am thinking the same thing and will try a simple, mechanical thermostat, something like:
https://www.stelpro.com/en-CA/line-voltage-mechanical-thermostat
As the on-board thermostat only controls the contactor, no need for a 7500W thermostat.
I'll do some research on this. The small thermostat on the Farenheat is starting to fail (the temperatures are starting to fluctuate, and it seems to only work at higher room temps).
Hey Speedster, nice seeing you over here on GJ. Good on you for posting a thread... I should have done one for my shop build but never got around to it.