The tauntaun test was also interesting but, also, didn't bring too surprising of results. Of course the question could also be how Han survived in the cold without the warmth of an animal while he built the shelter. IIRC he was no more heavily dressed than Luke was so he would've lost heat just as fast (if not faster) which would have really impacted his ability to build the shelter.
And maybe it's me but I never took it he was going to build a snow shelter but had something on-hand with his survival gear that'd make him a shelter rather quickly.
Han hadn't been out in the snow as long as Luke, hadn't suffered the exposure, hadn't lost a fight with a wampa and he was engaged in physical activity that would help him keep warm.