  A new concept realizing giant spin Nernst effect in nonmagnetic metallic
films is introduced. It is based on the idea of engineering an asymmetric
energy dependence of the longitudinal and transverse electrical conductivities,
as well as a pronounced energy dependence of the spin Hall angle in the
vicinity of the Fermi level by the resonant impurity states at the Fermi level.
We employ an analytical model and demonstrate the emergence of a giant spin
Nernst effect in Ag(111) films using {\it ab-initio} calculations combined with
the Boltzmann approach for transport properties arising from skew scattering
off impurities.
