Final answer:
As the outdoor ambient temperature increases with fixed metering, the required superheat decreases.
Step-by-step explanation:
As the outdoor ambient temperature increases with fixed metering, the required superheat decreases. This is because superheat is the difference between the actual temperature of a vapor and its saturation temperature at a given pressure. When the outdoor ambient temperature increases, the saturation temperature also increases, meaning that less superheat is required to achieve vaporization.