  We report an experimental demonstration of the magnetoelectrocaloric effect
(MECE) in multiferroic $\mathrm{GdFeO_3}$. The temperature of the magnetic
material changes when an external electric field is suddenly changed. MECE is
the largest below the ordering temperature of Gd moments and modifiable by a
magnetic field, suggesting that the ferroelectric transition affects MECE. The
observed MECE shows a higher energy efficiency than typical magnetocaloric
effects and adiabatic nuclear demagnetization. The present findings provide a
proof of concept of MECE in multiferroics.
