I am looking to install a draft tower (2-3 faucets) on my bar. I want to keep the kegs in a fridge under the bar and run the hoses a short length to the tower. What are some good options to keep the beer lines cold from the tower to the fridge that are easy to operate and maintain? or is this even a valid option for serving beer?

Not sure exactly how you are setting this up, but in my fridge/tap set up I put a small computer fan that I got from Radio Shack and hooked that up to tubing that leads up the tower. This blows the cool fridge air up the draft system. Works great and I have it on a separate plug so it only needs to run when I think I'm going to be serving beers.

Most designs I've seen (without getting into gycol chilling) use a fan to blow cold air from the frig up into the tower with a return conduit to allow the air to circulate. And lots of insulation. I would try to use a smooth wall blower hose if possible instead of the ribbed below for better air flow.

http://www.micromatic.com/beer-question ... d-419.html

Many such muffin fans are 12V DC, intended for the inside of computers where 12V is universal. Your fridge may not have any 12V supply, so you'd need to add an adapter brick. A few years ago I found a few 120V AC versions of these fans, can't remember where, probably a small electronics component store (you know, like a place that would have parts for Ham Radio, vacuum tubes, and more kinds of watch batteries than you could believe). A quick google search shows a few as well. Good luck.