I'm a long time lurker on these forums, but decided to give a few pics of my recent "tower cooling" with copper. A little about my setup- My tower sits on top of a bar counter while the kegerator is below, so there is a gap of about 2" that I have foam insulation around. I've always had a problem with wild beer and always suspected it was a temperature issue since the tower got almost no cooling from the kegerator.
So... I found this forum and great suggestion on a Google search.
When I originally added the copper pipes, I had about 2" sticking into the fridge and the rest was in the tower. I found, however, that the temp of the copper in the tower was 10-15 degrees cooler than the fridge temperature. I then added a couple of t-joints and extended the pipe an additional 5" towards the back. The temperature of the copper inside the tower is now 2 degrees cooler than the fridge AND the copper did not take up more precious cargo space inside the kegerator. I also insulated the copper with foam noodle and 2 1/2" PVC pipe around the foam. All pieces were purchased for less than $20. Here are a few pics of my setup:
Goodbye wild, foamy pours. No more wasting the first 4 ozs off my tap!