  We calculated the thermal partition function for the massless free bosonic
Higher spin fields (Fronsdal theory) of thermodynamical system by using Feynman
path integral formalism and also we calculated the free energy, average energy,
energy fluctuations, specific heat and entropy by applying the dimensional
regularization method. Moreover, we isolated the UV divergences of the above
physical quantities by dimensional regularization method. Nevertheless, we
observed the duality between the thermodynamical system of massless free
bosonic HS fields on $d \geq 4$-dimensional Minkowski spacetime and
thermodynamical system of Klein-Gordon scalar fields on 4-dimensional Minkowski
spacetime at the thermal equilibrium condition. We also calculated the
fluctuations in the energy value $E$ is quite negligible at the thermodynamic
limit $V \to \infty$ (IR divergence) and if $T \to \infty$ also negligible in
fluctuations in the energy value. This energy fluctuations is depends on the
dimensionality of the system i.e $d \geq 4$ and also depends on the temperature
of HS fields. The entropy of thermodynamical system of massless free bosonic HS
fields diverges logarithmically at temperature is infinity and also diverges at
thermodynamic limit i.e $ V \to \infty$ and also depends on the spin ($s$) of
the massless free bosonic HS fileds. The entropy of massless free Bosonic HS
fields depends not only temperature of the system but also depends on the
dimensionality of the system i.e $d \geq 4$. However, the entropy value is
finite for finite value of temperature and finite value of volume of massless
free bosonic HS fields.
