My wife got a new fridge for the kitchen, which means I get a new fermentation chamber. I'm looking at temperature controllers. From what I can tell, controllers work by essentially cutting power to the fridge when interior temperature is below the temperature setting. Does that mean the freezer compartment on on the fridge is useless? (If the freezer compartment works, I may also be able to wrangle a small chest freezer to convert to a kegerator.)