Ok, I have my tower mounted on my bar top. My beer line runs mainly outside the fridge. It is inside flex tubing which is wrapped in 2 layers of insulation. There is a fan that blows cool air up the tube the beer line is in. There is also a smaller tube that is connected to another fan that sucks air back down from the top of the tower and then circulates inside the fridge. My question is, should I leave the fans run constantly or only when the compressor kicks on?