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We demonstrate that Casimir-Polder potentials can be entirely independent oftemperature even when allowing for the thermal photon numbers to become largeat the relevant molecular transition frequencies. This statement holds forpotentials that are due to low-energy transitions of a molecule placed near aplane metal surface. For a molecule in an energy eigenstate, thetemperature-invariance is a consequence of strong cancellations betweennonresonant potential components and those due to evanescent waves. For amolecule with a single dominant transition in a thermal state, upward anddownward transitions combine to a temperature-independent potential. Theresults are contrasted with the case of an atom whose potential exhibits aregime of linear temperature-dependence. Contact to the Casimir force between aweakly dielectric and a metal plate is made.

Temperature-invariant Casimir-Polder forces despite large thermal photon numbers