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FiberCor Insulation and Winterizing Your Caldera Spa: What Owners Should Know Caldera spas are built with full FiberCor insulation surrounding the shell, and understanding what that material actually does helps explain why a properly maintained Caldera spa holds heat as efficiently as it does throughout the year, and what to pay attention to as winter approaches. This guide covers how FiberCor insulation works, how it fits into the spa's overall energy efficiency, and the winterizing steps that … read more