Thermal properties, stability, and reliability of lauric acid-based binary eutectic mixtures for building energy efficiency were studied. The eutectic points and phase change performance of these binary PCMs were obtained as follows: (1) For lauric acid–myristic acid, the mass eutectic point is 70 wt % LA/30 wt % MA. (2) For lauric acid–palmitic acid, the eutectic point is 79 wt % LA/21 wt % PA. (3) For lauric acid–stearic acid, the eutectic point is 82 wt % LA/18 wt % SA. The eutectic PCMs have a melting enthalpy of 166.18, 183.07, and 189.50 J·g –1 and a melting temperature of 35.10, 37.15, and 39.29 °C for lauric–myristic acid, lauric–palmitic acid, and lauric–stearic acid binary eutectic PCMs, respectively. The experimental results are very close to the theoretical results. Moreover, from FT-IR and XRD investigations, we realized that during the preparation of the lauric acid-based binary eutectic fatty acids, no new functional groups were produced. Besides, the TG illustrated that the LA–MA eutectic PCMs, LA–PA eutectic PCMs, and LA–SA eutectic PCMs exhibit excellent thermal stability below 126.51, 135.7, and 110.08 °C, respectively. Finally, lauric acid-based binary eutectic PCMs still show excellent thermal properties and chemical structure after 500 hot and cold cycles. All in all, as a novel material for building energy conservation, lauric acid-based binary eutectic PCMs have broad prospects and good practicability.

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(1) The maximum mass adsorption rate of EP on L–S is 70%. (2) The melting temperature of LS/EP is 37.79 °C, with latent heat of 126.05 J g−1, and it has a crystallinity of over 90%. (3) LS/EP CPCM has good thermal stability and reliability.