  The Thermo Field Dynamics (TFD) formalism is used to investigate the regular
black holes at finite temperature. Using the Teleparalelism Equivalent to
General Relativity (TEGR) the gravitational Stefan-Boltzmann law and the
gravitational Casimir effect at zero and finite temperature are calculated. In
addition, the first law of thermodynamics is considered. Then the gravitational
entropy and the temperature of the event horizon of a class of regular black
holes are determined.
