  We study the performance of quantum absorption refrigerators, paradigmatic
autonomous quantum thermal machines, and reveal central impacts of strong
couplings between the working system and the thermal baths. Using the reaction
coordinate quantum master equation method, which treats system-bath
interactions beyond weak coupling, we discover that reshaping of the window of
performance is a central outcome of strong system-bath couplings. This
alteration of the cooling window stems from the dominant role of parameter
renormalization at strong couplings. We further show that strong coupling
admits direct transport pathways between the thermal reservoirs. Such
beyond-second-order transport mechanisms are typically detrimental to the
performance of quantum thermal machines. Our study reveals that it is
inadequate to claim for either a suppression or an enhancement of the cooling
performance at strong coupling when analyzed against a single parameter and in
a limited domain. Rather, a comprehensive approach should be adopted so as to
uncover the reshaping of the operation window.
