Originally Posted by Pointyskull
Excuse another dumb question, so bear with me:
Why would I need a two-stage for a fridge?
I'm unclear on how heat control (or even how it would work on a fridge) is different from just controlling the fridge temp.
Sometimes you may want to raise the temperature. For example with a lager you would raise the temperature for a diacetal rest. Or if you do stepped fermentation where you progressively raise the temperature to keep the yeast more active or such. If your space is on the cold side you won't be able to raise the temperature without a heat source.
Also, it provides for tighter temperature control. The fridge may overshoot a degree or two by itself so the heater can keep you in a tighter band.