Excess enthalpies (H-E) were determined for two ternary systems, 1,3-butanediol + cyclohexanol + decane and 1,2-propanediol + 1,3-butanediol + cyclohexanol, and for their five constituent binaries at 318.15 K with a Calvet-type microcalorimeter. The ternary liquid-liquid coexistence curve for the first ternary system was measured at 318.15 K by the titration method. From the experimental results for binary systems, parameters of the Redlich-Kister equation were obtained and used to predict the ternary H-E results.