Phase-change Material Saves Energy Pure Temp, developed by Entropy Solutions, is a phase-change technology that is designed to be incorporated into insulation, floors, walls, ceiling tiles and HVAC systems. It can save up to 30 percent in a building’s overall energy usage. Made of fats and oils, it works by absorbing and releasing energy based on outside temperature to regulate the inside temperature of a structure. (952) 941-0306 /