  A class of Hamiltonians that are experimentally feasible in several contexts
within quantum optics and lead to so-called cooling by heating for fermionic as
well as for bosonic systems has been analyzed numerically. We have found a
large range of parameters for which cooling by heating can be observed either
for the fermionic system alone or for the combined fermionic and bosonic
systems. Analyzing the experimental requirements, we conclude that cooling by
heating is achievable with present-day technology, especially in the context of
trapped-ion and cavity QED, thus contributing to the understanding of this
interesting and counterintuitive effect.
