A commercial surface area analyzer and Calvet-type microcalorimeter were combined for measurements of heats of gas–solid interactions, providing enhanced resolution, flexibility, and throughput compared to conventional methods. Integral adsorption enthalpies for half monolayer coverage on ${\mathrm{HfO}}_2$ and ${\mathrm{ZrO}}_2$ surfaces were found to be in the range $-130\text{–}190$ and $-110\text{–}170\mathrm{kJ}$ per mole of gaseous ${\mathrm{H}}_2\mathrm{O}$ for differently prepared monoclinic phases and $-70$ and $-90\mathrm{kJ}∕\text{mole}$ for tetragonal phases from precipitation. The surface enthalpy for anhydrous tetragonal ${\mathrm{ZrO}}_2$ was derived as $1.23\pm 0.04\mathrm{J}∕{\mathrm{m}}^2$ from water adsorption and high-temperature solution calorimetry data.