  An analytic expression for the DC electrical conductivity in terms of black
hole horizon data was recently obtained for a class of holographic black holes
exhibiting momentum dissipation. We generalise this result to obtain analogous
expressions for the DC thermoelectric and thermal conductivities. We illustrate
our results using some holographic Q-lattice black holes as well as for some
black holes with linear massless axions, in both $D=4$ and $D=5$ bulk spacetime
dimensions, which include both spatially isotropic and anisotropic examples. We
show that some recently constructed ground states of holographic Q-lattices,
which can be either electrically insulating or metallic, are all thermal
insulators.
