Thermostat smart app to override minimum of actual thermostat

I have the Honeywell wifi thermostat in my garage, but it only reads down to 40, and that is the lowest set point.

Is there an existing smart app that will only use a remote sensor to turn the thermostat on and off? (I suppose I could do this in webcore too, but it’s over my head).

My goal is to only kick the heat on there at or just above freezing. Even in the teens here, it’s typically in the upper 30’s in the garage. I don’t want to leave the thermostat at 40 which makes it run too much.