In building my Brutus 10, I researched a lot of pid controllers and went with Auberin for my stuff. In the process of buying two controllers for the gas valve / burners, I bought a dual controller for my fermentation fridge. Not only was it cheaper than the Johnson, it can cool and heat to maintain a near perfect temperature range. You can wire up a light bulb, or heat wrap and just plug it into the unit once you hard wire everything. Here’s the part- SYL-2342.