First, my setup; I have a fully carved bass, a fairly thick (defiantly thicker than average) soft case, and a minivan. What I've been doing is warming up my van first (10-15 minutes depending on the outside temp), then bring my bass from inside and directly into the back of my van then turn the rear heat off. I figure I don't want it blowing air directly on my bass the whole ride. Is there anything else I can or should do? I've considered a hard case for peice of mind against bumps if nothing else but I can't afford one right now because I just spent $5.5k on my bass. Now how cold is cold? Well this year I've been lucky it seems to get up to about 20F each night I'm taking my bass out but tonight I'm looking at about 10, and tomorrow just below 0.