  We study thermoelectric transport in ultrathin topological insulators under
the application of circularly polarized off-resonant light of frequency
{\Omega} and amplitude A. We derive analytical expressions for the band
structure, orbital magnetization Morb, and the thermal (\k{appa}xy) and Nernst
({\alpha}xy) conductivities. Reversing the light polarization from right to
left leads to an exchange of the conduction and valence bands of the symmetric
and antisymmetric surface states and to a sign change in Morb,{\alpha}xy, and
\k{appa}xy. Varying the sample thickness or A/{\Omega} leads to a strong
enhancement of Morb and {\alpha}xy. These effects, accessible to experiments,
open the possibility for selective, state-exchanged excitations under light and
the conversion of heat to electric energy.
