Thanks!
I had a bunch of tubular foam insulation laying around so I taped that on the 2 main lines.
I thought I had a problem...it started getting warmer, but now getting colder again. Was down to -15c in the box. I think the base of the sensor unit must have gotten so cold it shut down. Not sure though. Was weird because I put a hot light-bulb near the sensor to keep it warm.
Temps are really no better than without the box, but now my room doesn't get cooled off.
How cold will my cpu get with a water-chiller?