Each ACSC regulates temperature and airflow through which component to optimize temperature regulation?

The correct answer is Trim air valves, as these components are specifically designed to mix heated bleed air with the cabin air to adjust and regulate the temperature within the aircraft's cabin. By controlling the flow of trim air, the system can maintain a comfortable climate for passengers and crew, ensuring that temperature variations are minimized and that the air quality remains optimal.

The trim air valves play a crucial role in managing the temperature by allowing precise adjustments to the mixture of conditioned air, which helps to balance the temperature across different zones in the aircraft. This is particularly important in larger aircraft where cabin segments may experience different thermal loads.

The other options serve different functions in the aircraft's environmental control systems but do not directly regulate temperature in the same manner. Ozone filters, for instance, are crucial for ensuring that harmful ozone is removed from the air but do not influence temperature regulation directly. Zone controllers manage the overall climate control for specific areas but rely on devices like trim air valves to adjust the actual air temperature. Meanwhile, pack flow controllers primarily manage the flow of air from the environmental control packs but do not independently regulate temperature. Therefore, trim air valves are key components that facilitate the optimization of temperature regulation in the aircraft.