Which process would best represent the opposite of exhausting air from a system?

Cooling process.

The process of exhausting air from the system is ventilating. The opposite of ventilating is cooling. The roof top units mounted above are efficient in performing various functions such as ventilation, cooling, heating, and many more. There is no much difference between cooling and ventilation systems. In fact, these two go hand in hand. Ventilation is most energy efficient and least expensive way to cool buildings.