More info please, Roger. Was it left with power off for a month, or buried in an ice storm that moved a glacier four miles wide, or was it sitting empty and some water dripped into it and froze... ??
Inquiring minds want to know.
I don't live in snow and/or ice, but I strongly doubt that either of the insulation techniques HotSpring employs would be better or worse in any given situation. That is, I think they are all good, and about equal. One thing to know for sure: the Limelight and Hot Spot tubs do NOT have full insulation surrounding the equipment area, as the HotSpring tubs do.