  In three previous papers we presented the LARES 2 space experiment aimed at a
very accurate test of frame-dragging and at other tests of fundamental physics
and measurements of space geodesy and geodynamics. We presented the error
sources in the LARES 2 experiment, its error budget, Monte Carlo simulations
and covariance analyses confirming an accuracy of a few parts per thousand in
the test of frame-dragging, and we treated the error due to the uncertainty in
the de Sitter effect, a relativistic orbital perturbation. Here we discuss the
impact in the error budget of the LARES 2 frame-dragging experiment of the
orbital perturbation due to thermal drag or thermal thrust. We show that the
thermal drag induces an uncertainty of about one part per thousand in the LARES
2 frame-dragging test, consistent with the error estimates in our previous
papers.
