A method for air conditioning using a primary power source augmented with an ancillary power source which is accomplished by receiving a heat-laden first working fluid at an initial pressure; pre-pressurizing the heat-laden first working fluid to a pre-pressurization pressure according to an amount of available ancillary power; passing the pre-pressurized heat-laden first working fluid to a primary compressor when the pressure of the pre-pressurized heat-laden first working fluid is greater than the initial pressure; and passing the heat-laden first working fluid at the initial pressure, or at a pressure that is slightly less that the initial pressure, to the primary compressor when the pressure of the pre-pressurized heat-laden first working fluid is not greater than the initial pressure.