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The improvement in heat capacity of potential building materials by incorporation of phase change materials (PCM's) has been demonstrated by thermal measurements. Thermal analysis of PCM's is continuing in order to identify the most promising systems. Particular attention is being focused on polyethylene glocols and MgCl sub 2 --CaCl sub 2 --H sub 2 O eutectic systems although other materials are still under consideration. Efforts to encapsulate phase change materials in porous aggregate are continuing. Non-leaking coatings for the aggregate and for the PCM matrix materials are under development. Thermal analysis capabilities have been established and include DSC, TGA, a thermal comparator for conductivity measurements, and a heat-flow calorimeter for heat capacity measurements on large samples. Thermal measurements on PCM composite materials are continuing. (ERA citation 04:019290)