  Garlatti et al. [Appl. Phys. Lett. 103, 202410 (2013)] report theoretical
simulations aimed at showing that the best molecular nanomagnets for magnetic
refrigeration between T = 10 K and sub-Kelvin region are those made of strongly
ferromagnetically-coupled magnetic ions. This Comment revises such conclusion
based on results that, apparently, contrast with the established belief in this
research field.
