We report on the specific heats of typeEthermocouple wires, constantan (55% Cu–45% Ni) and chromel (10% Cr–90% Ni), measured using ac calorimetry in the temperature range 18–290 K. Data were normalized to values at 200 K determined by differential scanning calorimetry. The constantan values are close to those of other Cu/Ni alloys, while this is the first reported low‐temperature result for chromel.