This is the style (mine's a Johnson Controls) thermostat that I have on my keezer/kegorator.(the word controller usually indicates some level of programmable logic)
This is not a direct replacement for the OEM thermostat. The sense bulb will not fit into the sense tube of the fridge/freezer.It will require a fairly extensive though not difficult rewire of the cooler.
The single pole, double throw (SPDT) feature is what allows you to heat OR
cool with addition of a season switch. There is no dead band with this stat, it will either be heating or cooling at all times. (you don't have
to use both sides of the throw).This thermostat will also allow you to adjust the differential from 3 deg F to 10 deg F.
You certainly won't need 20 feet of remote line, but it won't really hurt anything.
PM Me if you need/want any more specific help.