From my research for the project I did, I have found several easy ways, and a few more difficult ways of keeping beer lines cold.
To summarize into categories:
- Insulate the crap out of your lines, and enjoy a warm first pour every time.
A little handy:
- If it's a fixed run and won't flex, install a 2" or bigger PVC pipe to run your lines in. Install a 1" or so flexible plastic conduit inside that pipe, all the way to your tower, and blow cold air from the keezer through the little pipe. (This has great reviews in the forums) You have to get a project box and a computer fan. Something like this
Get out the tools:
- Drop a $20 pond pump into a corny of water in your keezer. Pump it through some lines in your trunk to the taps, where it turns around and goes back to the corny. **Simple, but use copper for the coolant if you can. Better heat transfer.
I could do it easier, but wth right?!?:
- Any of many designs here, from cannibalizing an air conditioner, to building a heat exchanger (what I did), to any other NASA cross bred with Red Green crapped out a Steve Erkel type contraption for chilling a coolant of some sort, pumped through the lines going to your tap.
I recommend number 2 for it's simplicity, low cost, and (from what I've read here) effectiveness.