I have an upright refrigerator/freezer with a Johnson temp controller installed. It works great and has plenty of room in the lower fridge section for 2 large carboys. The top freezer section is just wasted (very cold) space. It seems like such a waste to make this area so cold just to get the fridge part down to fermentation temp. I was thinking if I could open some holes between the freezer part and the fridge below it might work more efficiently (running less time). I was afraid to start cutting holes since there could be coils or refrigerant plumbing going between them. Has anyone had experience with this?