  We consider the scaling of thermal transport in the presence of electric and
magnetic fields near the finite temperature transition from the metallic normal
state to the superconductor. We do so with fully relaxational, model A,
dynamics for the order parameter and particle-hole symmetry. This enables us to
determine the exact scaling dimension of the heat current operator and hence
critical exponents for all transport coefficients in terms of the
(approximately) known values of the correlation length exponent and the dynamic
scaling exponent. In particular, we determine the critical behavior for the
Nernst coefficient.
