A magnetocaloric alloy composition consists essentially of 20-40 weight % Mn, 6-26 weight % In, 1-5 weight % Si, and 0.3-12 wt. % of at least one other element selected from the group consisting of: Ga, Ge, Ag, Gd, Co, Pd, Sm, V, and Sn, balance Ni.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
 The United States Government has rights in this invention pursuant to contract no. DE-ACO5-000R22725 between the United States Department of Energy and UT-Battelle, LLC.