To cool your room faster and more efficiently with an air conditioning vent, you should point the vent in a downward direction. Here's why:
Cold air sinks: Cold air is denser than warm air, so it naturally tends to move downward. By pointing the vent downwards, you're allowing the cold air to move directly into the room, effectively cooling the space where you need it the most.
Mixing effect: When cold air is directed downwards, it creates a mixing effect with the warmer air in the room. This helps to distribute the cooler air throughout the space, leading to a more even and comfortable temperature.
Avoiding unnecessary cooling: If you point the vent upwards, the cold air will tend to rise and may end up cooling the ceiling or upper parts of the room more than the living space. This wastes energy and doesn't provide the cooling effect you want at the human level.
Remember that the best direction for the air conditioning vent may also depend on the specific layout and configuration of your room, so you may need to experiment a bit to find the optimal direction for your particular situation. Additionally, ensure that there are no obstructions blocking the airflow from the vent, as this can also hinder the cooling efficiency.