The most important piece of equipment that you will need is a fermenting box. This little, or large, box will allow the garlic to sit at a consistent temperature for the allotted time. I found that a wine cooler works the best because it is insulated, therefore it will hold the heat very well. For the fan, I actually had an old hood unit from my stove that I replaced, so I kept the housing that the fan sat in and just cut the metal down to fit it into the wine cooler. I also kept the switches in-tact to be used to control the fan speed and whether I want the light on or not.
I now have a fan and two switches to control the two elements that will regulate and circulate my heat. The last item that is need is a thermostat, these will run anywhere from $80-$120, all depending on what type you get. The thermostat that I used came from Johnson Controls and they can be purchased here
, this device will turn the power on and off to the box based on temperature.
Now go find yourself a vessel to make the garlic in, a device to heat the box with, a thermostat, and based on the size of the box, you will need a fan.