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We explore the competition and coupling of vibrational and electronic contributions to the heat capacity of Al and Al₃Sc at temperatures below 50 K, combining experimental calorimetry with highly converged finite-temperature density functional theory calculations. We find that semilocal exchange-correlation functionals accurately describe the rich feature set observed for these temperatures, including electron-phonon coupling. Using different representations of the heat capacity, we are therefore able to identify and explain deviations from the Debye behavior in the low-temperature limit and in the temperature regime 30–50 K as well as the reduction of these features due to the addition of Sc.