This could be useful for controlling the direction of airflow, especially in situations where you want the cool air to be directed upward rather than straight ahead. It could potentially help the cool air to reach further.

Just print and clip it to the air vent. Works for the U-shaped Midea window AC.

Based on my experience, it does help raising the cool air. It doesn't interfere the vent closing or swinging.

Tips: you can scale it down and print it as 2 or more pieces.