Currently there are items that cool a fixed amount for fixed energy, and ones that cool in exchange for item integrity. It might be cool to have something like piezoelectric cooling: cooling in exchange for variable energy. It could be extremely powerful in exchange for tons of energy going to keep it running.
Also, it could be overloadable to control the energy use. Normal gets you heat sink levels of cooling, overloaded gives you ten times that for maybe 20x the energy use.
Just an idea brought to you partly by the thought that one sees very few runs with 4+ power slots.