  We demonstrate the possiblity to cool nanoelectronic systems in
nonequilibrium situations by increasing the temperature of the environment.
Such cooling by heating is possible for a variety of experimental conditions
where the relevant transport-induced excitation processes become quenched and
deexcitation processes are enhanced upon an increase of temperature. The
phenomenon turns out to be robust with respect to all relevant parameters. It
is especially pronounced for higher bias voltages and weak to moderate
coupling. Our findings have implications for open quantum systems in general,
where electron transport is coupled to mechanical (phononic) or photonic
degrees of freedom. In particular, molecular junctions with rigid tunneling
pathways or quantum dot circuit QED systems meet the required conditions.
