A method of apparatus for immersion cooling electronic equipment including immersing the electronic equipment in a pressure-sealed tank containing a heat transfer fluid and including a vapor space fluidicly coupled to a condenser; operating the electronic equipment to generate heat and evaporate some of the heat transfer fluid, causing heat transfer fluid vapor to enter the condenser; condensing the heat transfer fluid vapor in the condenser to produce a condensate; returning the condensate to the tank; and increasing power consumption to increase heat generated by the electronic equipment and develop an increased pressure of the heat transfer fluid vapor to bring the apparatus into an equilibrium condition.