How to Make a Cave to Age Cheese

Step 3 Wire Up Temperature Controller

Using two old extension cords, I wired up the temperature controller so that the fridge plugged into one relay, and a light bulb plugged into the other.  I set the fridge's internal thermostat to the coldest setting.  The light bulb is only 25 watts - if that doesn't keep the fridge warm enough, I'll put a bigger bulb in.

Next, I tested all the parameters by sticking the temperature probe in hot and cold water.