Every chest freezer that I have come accross in the last 20 years had a dial to control temperature all the way from fridge (~5°C) to deep freeze (~-18°C). Bee

Every chest freezer that I have come accross in the last 20 years had a dial to control temperature all the way from fridge (~5°C) to deep freeze (~-18°C). Beer fermentation is very sensitive to temperature, so a very common mod is to get a digital heat/cool temperature control and splice it into the electrics. The heat output is wired to an incandescent bulb or reptile heat pad or something thats placed inside with the beer fermentor.