 Thermostability of pure phase change materials, de-manitole, and nano-enhanced phase change materials, NEPCMS, with 0.5% and 1% multi-walled carbon nanotube, MWC NTE, additions were compared using thermogravimetric analysis, TGA. Model-free kinetics techniques were used to analyze the kinetics of both pure and any PCM degradation. The activation energy of the pure PCM samples ranged from 71.10 to 77.77, 79.36 to 66.87 and 66.53 to 72.52 kilojoules per mole, KJ slash mole, using the Ozawa, Kisindrakihurasunos, KAS, and Star Inc. methods, respectively. NEPCMS, 1% MWC NTE, activation energies ranged from 76.59 to 59.11, 71.52 to 52.28, and 72.15 to 53.07 kilojoules per mole, using the same three methods. This article was authored by Ravi Kumar Katala, Bharat Kumar Chigalapalli, Srinivasanak Mikhailov, and others.