In the scenario you described, where the outside air is cooler than the warm room, the best method to cool the room at night using a fan is to position the fan to move the cool air from outside into the room. Here's a step-by-step guide to optimize the cooling:
Place the fan in a window or doorway facing the open balcony, with the back of the fan facing outside. This configuration allows the fan to pull the cooler air from the balcony into the room.
Open windows or doors on the opposite side of the room to create cross-ventilation. This will help facilitate the movement of air through the room.
If possible, use a box fan or window fan, as they tend to move larger volumes of air compared to a regular table fan. This increased airflow will enhance the cooling effect.
Adjust the fan speed based on your comfort level. Higher fan speeds generally provide a stronger breeze but can also be noisier.
Consider using additional cooling methods to enhance the fan's effectiveness. For example, you could place a bowl of ice or a wet towel in front of the fan to create a makeshift air conditioner effect. The fan will blow air over the cool surface, providing additional cooling.
It's important to note that the effectiveness of this method may vary depending on the climate, humidity levels, and airflow in your specific location. Experiment with different fan positions and settings to find the most comfortable and effective setup for your room.