You have answered your own question without realising it.MashBag wrote:Fridges come with a stat and do chilled* within the temp range of the Stat.
The range the fridge can be set with the internal thermostat is often restricted compared to what it is capable of, both upwards and downwards.
There are lots of people who struggled to get their fridges to near zero or below (it makes lagering MUCH quicker) until they bypassed the built in thermostat.
It depends on the fridge though, eg my main fermenting one will go to about -1C using an external controller and it handily allows me to also go to cellar or higher temperatures at the other end, dependent upon what I need.